It's no secret that the engineers of the Tula plant have created equipment with which an ordinary owner has to feel like a mechanic. And to this day, having found another problem, the owner of Ant has to pick up a tool, remembering would-be engineers. One of the main problems is the engine of the Ant scooter, the repair of which is carried out in most cases of breakdowns.
Dynastarter
However, not only the engine can make the motorist visually see all the components of his motorcycle. The most common problem is dynastarter malfunctions. It, the engineers of the Tula plant, installed in Ant, instead of a conventional alternator.
Why is he so important? If you notice a red light on the instrument panel while the moped is running, it means that you are running out of charge. This happens because the generator does not produce alternating current. To begin with, in such a situation, it is necessary to check the integrity of the wires connected to the dynastarter and the relay-regulator. If everything is in order, then the problem lies directly in the dynastarter. It can have three main causes of problems:
- difficulty in the operation of the rotor (getting into the collector of dirt or accumulation of dust);
- hanging or wear of the brushes;
- violation of the integrity of electrical equipment.
Since in most cases the operation of the dynastarter is difficult due to contamination of the collector, it is worthwhile to carry out a simple disassembly according to the instructions described in the moped manual. The main rules at work are accuracy and cleanliness. After disassembly, be sure to rinse all parts well in gasoline and lubricate the rubbing parts and in no case throw away spare parts.
Engine Assembly
Unlike a dynastarter, repairing an Ant scooter engine with your own hands is difficult to perform according to the operation book. Therefore, it is worth turning to the advice of experienced motorcycle owners. Most often, it is necessary to disassemble the engine in case of malfunctions of the clutch mechanisms, the operation of the gearbox, as well as wear crankshaft, bearings or seals. The most important rule is not to be afraid to disassemble the engine yourself. Using this instruction, disassembly and assembly of the Ant scooter engine is not difficult.
So, the procedure for disassembling the engine:
You can see in more detail how to assemble the Ant scooter engine in a visual video at the end of the article. The essence of the assembly is in the reverse order of actions, but it is important to twist the parts with a certain force and synchronize the parts with the marks. In no case should you assemble the engine without detailed instructions written by the manufacturer.
At frequent breakdowns, the owners are thinking about which engine can be put on the Ant scooter. Instead of a native motor, you can use Chinese analog motors. Since the Ant has many copies in Asian countries, replacing the engine may become great option save in case of irreversible damage. True, you will have to make the fasteners yourself and, in some cases, remake the bridge for the left location of the chain. This is not very difficult, given that the Tula plant provided for the possibility of rearranging the bridge.
(2
ratings, average: 4,50
out of 5) The ant is a three-wheeled cargo moped that was produced by the Tula plant. Ant gained popularity due to the versatility of use and cost. A functional motorcycle was a way out of the situation where it was impossible to purchase a car in Soviet times. The carrying capacity of 250 kg, with a weight of 240 kg, made this transport indispensable in agriculture.
The scooter is distinguished by high maneuverability and cross-country ability, as well as small dimensions. In the garage, it will take up as much space as a heavy motorcycle with a sidecar.
The Soviet scooter "Ant", which is still popular, has the following technical characteristics:
- Length - 2.68 m.
- Width - 1.25 m.
- Height - 1.07 m.
- Dry weight - 240 kg.
- Load capacity - 250 kg.
- Speed - about 30 km / h.
- The engine is gasoline, two-stroke, with a power of 11 hp.
- 4-speed gearbox + reverse.
- Drum brakes with a mechanical drive on each wheel.
Among fans of this brand, there is an opinion that the scooter is not inferior in performance to Western counterparts.
Of the advantages of a moped, it is worth noting:
- Small turning radius - 3.5 m.
- The lightness of the Ant scooter, motorcycles significantly predominate in weight.
- Low cost - only used devices are on the market.
There are also disadvantages:
- There is a lot of used equipment on the market.
- The engine has a high fuel consumption - from 8 liters. per 100 km. But more often this figure is closer to 10 - 11 liters. per 100 km. due to increased wear.
- Frequent breakdowns due to low reliability, especially the engine.
The owners of the Ant have the most questions about the engine. After all, you want to moderate your appetite for fuel consumption.
Ant was equipped with a motor different from others produced by industry Soviet Union. Innovations in its design fueled interest in technology then. ordinary people. And now they are warming up restorers and collectors. The differences are:
- The presence of an electric starter.
- Forced cooling.
The main difference is the presence of an electric starter. This allowed the moped to be started in the same way as a car.
The cooling fan circulates air around the engine casing, removing heat from it. It is worth noting that such a scheme has a tolerable job.
The device of the motor is simple. But even this does not insure him against breakdowns, which are often associated with age. It’s not worth disassembling the motor just like that, but when the following signs appear, it’s worth taking up the tools:
- Launch problems.
- Oil leak.
- Lack of traction.
- Increased background noise.
- The winding lever does not return to its place.
Possible breakdowns:
- Worn seals.
- Poor assembly after previous repair.
- CPG failure.
- Worn bearings.
- The kickstarter recoil spring broke.
Note! Before overhaul power plant it is not necessary to wash it. It is enough to drain the oil and remove it from the frame.
cylinder block
Having unscrewed a few bolts, it is required to remove the cylinder head. Pay attention to the wear of the cylinder head gasket. Opposite the outlet window, you should feel the so-called development. If a characteristic wave or step is felt, then such a cylinder needs to be changed or bored.
The development is manifested where the piston rings are in contact with the cylinder. Where they work, the metal wears out, so a transition is formed at the border with 2 zones, which reflects the degree of wear.
The piston should be examined for wear. Some "Kulibins" manage to refine it with sandpaper.
Clutch
- Dismantling the clutch cover and kickstarter shaft. Pay attention to the return spring - often it bursts and the kickstarter does not return to its place. You can also check the timing chain tension at this point.
- Clutch disassembly. To do this, unscrew the nuts and remove the pressure plate from the basket.
- The lock washer must be unbent and a stick inserted under the tooth of the main gear sprocket. Please note that the thread on the crankshaft trunnion nut is right-handed. The nut needs to be loosened.
- There will be another lock washer that needs to be unbent. We take a puller and fixes the clutch drum. The thread on the clutch nut is left hand.
- The disk and drum are removed, as well as the clutch basket is removed from the shaft along with the chain and drive star.
Dinostarter
Dismantle the following items:
- Cooling casing.
- Ignition interrupter cam, but on the condition that the power plant was not converted to magneto. In this case, it is required to fix the rotor of the dynostarter. This can be done with a cooling fan or by fixing the crankshaft with improvised means.
- The rotor is dismantled using a puller - standard or homemade.
As a result, the rotor was removed.
Spare parts price
Despite the fact that the production of the device has long ceased, to this day you can find new spare parts that the industry produces. Some parts are imported, some are assembled. Kits are supplied:
- Clutch discs.
- Gaskets for the power plant and gearbox.
- nuts.
- Branch pipes.
- Levers.
The necessary details can be found on the Internet according to the catalogs of stores. The prices for spare parts of the Ant scooter are loyal. Here are some examples:
- Clutch disc - 400 rubles.
- Kickstarter shaft - 1100 rubles.
- Front shock absorber - 1600 rubles.
- Gearbox seals - 100 rubles.
- Piston - 2500 rubles.
- Reducer - 14,000 rubles.
- Wheel hub - 2000 rubles.
Judging by the prices, the device is more than cheap to repair. This is an important operational property for people in the countryside.
In terms of tuning the Soviet apparatus Ant, what only the owners do not come up with. After all, these are often technically savvy people who like to spend time in the garage. Several directions can be distinguished:
- Weight loss. To do this, you will need to remove the "extra" equipment. It includes a body kit in the form of wings, a hood and fairings, as well as all electrical equipment. For transportation of goods around the village in the summer, all this is unlikely to be required.
- Increasing the output from the power plant. To do this, cut the shaft of the dynostarter. The operation will add power and dynamism. Recoil during winding is leveled by trimming the crankshaft.
- Installation of other wheels. Front 4.5 - 9, and rear 7 - 10. Permeability and speed will increase.
- Improvement of the piston group . You can buy a piston with three rings and make an additional window in the cylinder for supplying the fuel mixture.
- Magneto and Cooling System Efficiency Improvement- This is an additional tuning.
The main task in tuning is to increase reliability and less poking around in details due to breakdowns.
In terms of engine tuning, some owners took drastic measures and installed the Lifan engine (Lifan 188f), which has a volume of 400 cubic meters, on the Ant scooter. see. And its power is 13 hp. A distinctive feature of this assembly is the variator and centrifugal clutch.
Centrifugal clutch is the best option For freight transport, because when driving over rough terrain on a loaded scooter at low speeds, it may slip. And that puts him out of action.
What are the alterations of the scooter "Ant" on the video:
To be honest, the task of removing the engine from the frame of the “Ant” is still a job ... As for me, it’s easier to pull off a diesel engine from a tractor than from this rumbler ... This is, of course, a joke. But seriously, removing the engine from the Ant is much more difficult and longer than from any other Soviet motorcycle.
Tools
- Flat screwdriver
- Open-end wrenches for 8, 10, 12, 13, 14 and 17
- Pliers and other rubbish ...
Preparation
If after removing the engine you are planning it, it is better to advance it while it is on the frame. And one more thing: since in any case we will have to crawl under the scooter and unscrew something there - look for some old sweatshirt or pea jacket for bedding
Withdrawal
Like it or not, but the winding lever will only interfere with us - we unscrew it
Loosen the two nuts on the muffler bracket.
The muffler, which will prevent us from removing the engine, is attached to the frame with two bolts. We unscrew the bolts and remove it together with the knee or disconnect it in place and remove it separately - it doesn’t matter
We unscrew the gearshift drive rod and throw it on the ground
Disconnect the breaker contact wire from the coil
Disconnect the mass wire. The ground wire is located at the bottom of the engine just behind the muffler elbow. Attaches to the engine with a 10mm nut.
We remember the location and unscrew the wires of the dynostarter from the relay-regulator. After unscrewing the terminals, remove the wiring harness from the frame
The engine is attached to the frame at three points: one at the very bottom, the other two - in front and behind. We unscrew the bolts that attach the engine to the frame. For greater convenience, the bolts on the engine can be left on and instead of them, only the brackets can be unscrewed from the frame
I want to immediately warn that this article - complete instruction on the bulkhead of the Tula engine, it is intended for a narrow circle of people to whom it can really come in handy. But I have an idea to write an analogue of this article in an accessible language and try to display in it the principle of operation of the engine itself, gearbox, clutch and other components so that even a person who understands nothing in technology begins to have at least some idea about the structure of the motor. If you have any thoughts on this, I'd love to hear it!
Probably I am not the person who was supposed to become the author of this article, but since no one has done this before me, then let it be written by me, over time, on the advice of more experienced comrades, I will make the appropriate changes.
We are talking about a complete overhaul of the engine, which may be required if there are problems with the gearbox, clutch mechanism, bearings / oil seals / crankshaft are worn out, or just something suddenly fell apart. I'll tell you from the very first step to the last. Many inexperienced owners of Tula equipment are afraid to climb there and, as they say, “half” the engine. I myself was in the same situation, any suspicion of a malfunction inside the engine caused a panic attack and a desire to abandon the scooters for fuck.
Therefore, I decided to write a disgracefully detailed article, there will be nothing special and new in it, just a lot of photos and explanations, and tips from personal experience. One of the biggest difficulties is to correctly parse and remember what comes from. I photographed the whole disassembly process and the position of some parts (how they are fixed, in what order, etc.).
To be honest, for all the time I have collected only one engine. It happened this summer, and now I immediately self-confidently rush into writing an article. But I dismantled as many as three engines (one per year), so I still remembered what came from, but I never assembled the other two engines. For various reasons, they lie sorted on the shelves.
As I already wrote in my topic about - the scooter got to me by the workers, it started, drove, but out of the prescribed 4 gears, the fastest one was missing - the fourth. This was the reason for the engine overhaul.
If you want to do everything well so that it works and you don’t have to regret later and take everything apart again, I advise you to follow a number of simple rules:
. To not allow no dirt especially during assembly and keep the workplace clean. Personally, I'm such a slicker that I even changed rags as soon as there was no white space left on them, and for this it was enough to run a rag over any surface a couple of times.
. Do everything to the max carefully, no manifestations of brute force. Of course, you can stupidly assemble / disassemble the engine with one hammer, but still, despite the fact that this is Soviet technology, it works according to certain laws of physics, which are carried out both for the Honda engine and for the Tula engine. As an example, I will say that if you press the sleeve out of the cylinder jacket and place it back with an offset of 1 degree clockwise / counterclockwise, the engine power can lose up to 2 hp. due to inaccurate alignment of the purge windows. Inaccurate pressing of oil seals and bearings is also fraught with the fact that you can not only damage their seats, but even block the bearing lubrication holes, and therefore it will quickly fail.
. Do not lose small parts, put all removed parts on a clean surface or a separate container.
Minimum tool you need:
Retaining ring puller (if not, it’s better to buy, it costs about 200 rubles in any auto parts store)
- Dino starter puller (no way without it, 150 rubles)
- slotted screwdrivers
- knife
- mallet
- hammer
- pliers
- a set of socket and cap keys (sizes 8 to 22)
- container for small parts
- gasoline for flushing and some kind of degreaser, you can use solvent 646, but they cannot wipe rubber seals.
Approximate costs in terms of money (depending on finances and the reason for the repair or wear of parts):
minimum (if you order in the RosOpt.com online store, I indicate all prices based on them, let there be such a small advertisement, but the office is really good):
A set of oil seals ........................................ ....................... 60 rubles
- a set of gaskets ........................................ ....................... 45 rubles
- sealant or bakelite varnish ........................................ ........ 90 rubles
total minimum........................................ ........ 195 rubles
maximum (i.e. must be added to the minimum):
New bearings (if you install domestic ones, you can meet 500 rubles. If you have expensive Japanese / Austrian bearings (SKF, KOYO, etc.), you will have to spend about 2-3 thousand.
Optionally, you can also replace:
- motor chain ........................................ .................................. 120 rubles
- clutch discs ........................................ .............................. 250 rubles
- crankshaft ........................................ ........................................ ... 950 rubles
total maximum........................................ ....... from 700 to 3500 rubles
Another small clarification about the photos, I did not record the complete assembly / disassembly of one particular engine. Those. a photograph, the caption to which refers to the disassembly of one or another node, in fact, may show the assembly stage of a completely different engine, but this is not important, the main thing is to pay attention to the specific detail and its location.
I'll start with the banality. The very first thing to do is remove the motor from the frame. What on Ants, what on passenger scooters, this procedure is exactly the same. To do this, first remove the bearing hood, which closes the engine. The operations described below can go in any order, with the exception of a few nuances that I will pay attention to. We are filming air filter, carburetor ( you can remove it entirely, you can disconnect only the cables, and leave it on the cylinder. For example, I removed the petal valve without disconnecting the carburetor from it, but not all engines with this valve). It is convenient to immediately remove the cooling deflector ( if it exists) (1 pictured below) and cooling snail (2) . If an ignition coil is attached to the snail, then disconnect from it high voltage wire (3) , i.e. remove the cap from the candle and then disconnect the long thin wire (4) , which comes to the minus of the coil. If the coil hangs on the frame, then instead of the wire (4) disconnect the other - coming from the breaker to the plus of the coil (5) .
1 - deflector
2 - snail
3 - high voltage wire
4 - positive power wire that comes to the negative of the coil
5 - ground wire coming from the breaker to the plus of the coil
The snail itself is attached with reverse side on 4 pins with nuts. Having unscrewed the nuts, it is necessary to carefully knock out the snail through a long piece of wood, because. it usually sits pretty tight. Then remove the impeller (1) and cam ( eccentric) ignition (2) . Remove the cover that closes the chain (3) (you can leave it hanging on the speedometer cable). Then disconnect the wire from the neutral sensor (4) and remove it - it is fastened with 2 screws.
Under the neutral sensor, a figured copper washer sits on the shaft:
Then you need to put the scooter at speed and holding it with a brake, using a puller, as in the photo, press out the dynostarter, after unscrewing the nut holding it on the shaft and forget about the washer under it:
This should definitely be done on an engine that has not yet been removed, otherwise it will cause a lot of problems later, because. the rotor sits very tightly and on an unlocked motor will scroll when the puller is turned. Immediately you need to put the key aside so as not to lose it. I advise you to do as I do: put very small parts in some kind of container, and large parts - on a rag along with the screws / bolts / nuts on which they were held, so that later you always know where which screw comes from. Or bait them in the place where they were unscrewed.
Also, without removing the scooter from speed, unscrew the nut of the drive star (number 5 on the third photo) , which is usually locked with a special washer. The edge of the washer must be carefully bent with a thick screwdriver or a chisel and a hammer. Unscrewing the nut itself, note that the thread on the shaft is left, unscrew it clockwise. Also under the nut is a large grower. I fastened similar paired parts (asterisk, washer, grover, nut) with wire so as not to forget which nut corresponds to which lock washer, etc.
4 wires leave the stator, the thickest goes to the starter relay (terminal WITH on the relay controller). One, the longest wire, goes to the terminal W, and two more wires, relatively equal in length, go to the terminal YASH(one of the wires must have a fuse).
With clean hands, remove the generator stator, it is fastened with 4 screws (1) and carefully pull out the cambric with wires. Usually you need to unscrew another bar to do this. (2 ) , which is fixed with two screws, these screws are one of those that connect the halves of the engine. Usually there is still a cardboard ring under the stator, I don’t know exactly what it is for, but I’m not in a hurry to throw it away.
Removing the gear shift lever (1) , kickstart lever (2) and clutch cable (3) .
The last thing left is to remove the muffler. Depending on the cylinder, you must either unscrew the large nut with a special key as in the photo below:
or two bolts (1) flange mounting (2) :
You also need to drain the oil from the gearbox by unscrewing the bottom drain bolt (see photo). The oil in the box is about 1 liter, so I advise you to prepare an appropriate container in advance.
Now 3 engine mounting points are unscrewed: front, rear and bottom (1) , the bolts are carefully removed, and after that the engine is almost always pulled out without difficulty. For convenience on Tulitsa / Tourist, you can loosen the rear landing mount (2) .
at the Ant, you can unscrew the front and rear ears of the mounts and remove the engine along with them.
About the motorcycle off-road I can't tell you, I didn't deal with him.
The cylinder can be removed both from the already dismantled motor, and from the motor still on the frame. Everything is extremely simple, regardless of the type of cylinder, 4 head nuts are unscrewed:
Remove the head, lift the cylinder itself up. If the piston group does not require replacement, then the piston can be left on the crankshaft. If it is replaced, then with the help of platy pliers, the retaining rings of the finger are removed. And then, using the design as in the photo, it is convenient to knock out the piston pin. This is done so as not to bend the connecting rod and damage the piston.
We remove the sleeve sitting on the secondary shaft, which is located behind the previously removed leading star.
We unscrew the "chamomile" in which the right crankshaft oil seal (hereinafter KV) is fixed.
It is fastened with 6 screws, I repeat that for convenience it is worth screwing such screws back so that later you don’t forget or lose anything, and put the “chamomile” aside.
Loosen the kickstarter bolt (1) , it is locked with a washer, which must be carefully bent. At the moment of unscrewing the bolt, the shaft must be bare (without kickstarter and other levers!), Otherwise, after unscrewing the bolt, it will make several turns under the action of the spring and may injure you. Now you can remove the left cover that closes the clutch, it is fixed with 5 screws (green arrows).
I advise you to tilt the engine to the left side and, while removing the cover, hold the starter shaft, because on earlier models, parts on the shaft were not secured and they could fly into the engine. It is worth warning that even if you drained the oil, anyway, after disconnecting the left cover when the engine is tilted, the remaining oil will flow out, so spread some kind of rag or just be prepared for it. It is better to put the kickstarter shaft aside, without disassembling it, if it is in good condition and does not cause any complaints.
Now we need to remove the clutch. Central adjusting screw (green arrow) you can not even touch it so as not to knock down its setting. But besides it, depending on the model and year of the scooter, the clutch can be either on 3 fingers with nuts (red arrows), which are simply unscrewed:
Or on 5 fingers with lock washers. It is convenient to remove the washers with a 10 wrench, prying a finger upwards on the ledge and pulling out the freed washer.
After the cover is removed, we take out all the clutch discs in a pack and tilt the engine to the left side, pour out 2 rods and a ball from the gearbox input shaft. To remove the clutch lever, unscrew this screw:
and carefully pull out the lever together with the spring.
Now, with a hammer, screwdriver or chisel, the lock washers of the crankshaft star nuts are bent (1) and clutch baskets (2) . Out of the hole (3) before that, the rods and the ball were pulled out.
After that, the entire assembly is removed (everything is straight together: an asterisk, a clutch basket and a chain), we also carefully remove the nuts with their corresponding lock washers so as not to forget which one is from where, although it is unlikely to confuse them during assembly. If the crankshaft is of the old model, it will be with a key, which also cannot be lost and should be immediately postponed, but mine sat so dead in the groove that it did not even have to be pulled out. At the crankshaft of the new sample, the asterisk sits on the splines. Under the clutch basket is another washer and bushing:
Now the engine is ready for the separation of the halves. remains to be unscrewed right side all connecting screws (red arrows), while you need to pay attention that all the screws are the same length, except for one (green arrow):
With the help of a mallet or even a thin screwdriver inserted neatly between the halves, we begin to separate them. The main thing is not to damage the joint surfaces of both crankcases. A mallet can be tapped on the left side of the crankshaft. In general, it’s worth figuring out how it will be more convenient to place the motor on the table, two cubes of timber were enough for me for this purpose.
When the halves finally succumb, it should not be difficult to separate them completely. In this case, the gearbox can remain both in the left half and in the right, depending on which bearing seats the shafts sit tighter in. In total, 2 shafts with gears, a gear shift drum and a shift shaft will have to be removed from the inside of the box. The last, and sometimes very laborious task, is to knock out the crankshaft. In one engine, I pulled it out with one hand, in the other, I could not knock it out with a sledgehammer. Only after a few dozen blows did he succumb and crawl out of the bearings. In no case should we forget about accuracy, but there are times when you can’t do without a sledgehammer (it’s unlikely that you have a hydraulic press in your garage?), so in the case described above, you need to tighten the KV nut back and beat on the plane of the nut so as not to spoil the thread on the shaft itself.
After the HF is removed, we should have 2 halves of the engine with oil seals and bearings and a clutch cover with 2 oil seals.
Much depends on the reason for disassembling the engine, if the breakdown is, for example, in a collapsed gearbox shaft bearing, or a crankshaft replacement is required, then other whole bearings do not always change. They always advise, since the engine has been opened, at least change the seals, because. it is not known when the next time you will have to half the motor, and a leaky oil seal can create a huge headache, especially since the set costs no more than 100 rubles. Bearings can be checked by their fit on shafts and in bores. If the bearing falls out of the socket intended for it, or does not fit tightly on the shaft, then it is better to replace it, but there are times when the problem is in the hole or the shaft is already worn out. In this case, you can do as I do - use the retainer of cylindrical joints. It costs about 150-200 rubles, grabs tightly. A more complex option is galvanizing in order to increase the diameter of the shaft or bearing. If all bearings are very tight both on the shafts and in the seats, then this perfect option and don't touch anything.
In our case, we will change all seals and bearings. Let's start with the clutch cover, there are only 2 seals, which are convenient to pick out with pliers or duckbill pliers. In the photo, the shift shaft seal (1) already removed, and the kickstarter shaft seal (2) still in place.
We must not forget that the stuffing box is not just a piece of rubber - inside it is a metal ring of the required diameter, and tearing the edges of the stuffing box, the ring will remain in the nest, so you need to try to hook it with pliers from different sides and pull it up in turn. By the way, I note that in the aforementioned cover there is also a small sleeve (see photo) but you shouldn't take it out.
In the left half of the engine there are 2 gearbox bearings, 2 KV bearings and a KV oil seal. Gearbox bearings (1) without problems knocked out inside, while the retaining rings can not even be removed. bushing (2) you can not touch it, and if you removed it, then do not forget where it came from.
With crankshaft bearings, everything is much more difficult. First, all retaining rings are pulled out. And then I advise, for example, with the head of a huge 20 cm nail, knock on the circle of the inner race of the bearing and knock it out, i.e. the inner bearing is knocked inward, the outer bearing is knocked out. To remove the gland, you need to knock on its edges, where the metal ring is located, with a nail it will be possible to scratch the inner surface of the seat. So it's better here wooden block, the size of a hole, or use a timing valve from a car that is suitable in diameter, or grind the old bearing on the grinder around the edges so that it crawls into the seat without interference, and knock out the oil seal by knocking on it. And the best option is to make just such a sleeve, with an outer diameter of 51 - 51.5 mm, an inner diameter of ~ 30 mm, and a depth of at least 70 mm, with a sleeve length of about 100 mm. It will also come in handy when installing new seals and bearings.
In the right half there are 2 more oil seals and 3 bearings. Both glands can be easily pulled out with pliers, small (2) you can even pry it with a screwdriver (it is no longer in the photo).
In place of the crankshaft roller bearing, usually only the outer race remains, it can be knocked out with the same nail.
But with gearbox bearings it will be much more difficult. If 204 output shaft bearing (1) taps inward without problems, then 202 input shaft bearing (2) on the one hand it is completely closed and it will not work out in any way. In general, if it sits tight, I would advise you not to touch it, because. You need a special puller to remove it.
I didn't have that. In one case, I acted sadistically, I broke the metal brackets that hold the balls, then moved all the balls to one side and pulled out the inner race of the bearing in the opposite direction from them.
Having taken out all the giblets, he carefully pry off the outer race of the bearing remaining in the socket with a large screwdriver. In another case, this bearing fell out of the socket on my own, or it can simply come out so that the bearing will sit tighter on the shaft than in the hole and will also come out on its own. There is also an old grandfather method: push through central hole bread pulp or plasticine, and sooner or later this mixture will squeeze out the bearing at the edges. There is usually an oil slinger under the bearing:
I ruined my first puck and then cut it out of an aluminum can:
Now we have a crankcase completely freed from all the insides. All other nuances of the assembly will be in the second part, which I will write a little later.
Just a couple of months ago, an old client asked to capitalize the engine of his Ant for the season. He is not greedy for money - he promised to buy everything that is needed for repairs. We agreed, the client brought it for repairs. piston, crankshaft, motor chain and almost all bearings were worn out.
The client insisted on buying a new crankshaft. They are now in abundance in any store - I don’t want to take them, but their quality is still the same ... I resisted for a long time and in the end the client found a used engine from which I pulled off the crankshaft. Of course, it was slightly cushioned, but the bearing of the lower head of the connecting rod was intact and safe, and we don’t need more.
Tools
- Large flat screwdriver
- Heads for 14, 17, 22
- Pliers
- Clutch basket puller
- sealant
- Wish
Preparation
Before installing the crankshaft, it is advisable to check it for runout. And it doesn’t matter if the crankshaft is new or used, you need to check it otherwise, with today’s “quality” of spare parts, you can repair the engine and then suffer for a long and tedious time with it. We lay the crankshaft on the prisms and check the beats, the norm: no more than 0.03 mm. If you don’t have an indicator, take the crankshaft to a good turner
Build errors
In most cases, the right main bearing of the crankshaft, due to an assembly error, fails almost in the first season after repair. The engine we are currently repairing is no exception. The bearing has almost crumbled and in any case it needs to be replaced with a new one.
The error lies in the fact that when installing the flange on which the dinostarter stator is attached, they cover up the oil channel through which the lubricant enters the main bearing and the oil seal.
In order for the main bearing to move away for at least a few seasons, cut the gasket under the flange a little along the contour of the oil channel and when you put the flange in place, do not smear anything with sealant there.
And another point: in order to avoid self-loosening of the bolts securing the dinostarter stator flange to the crankcase, and they turn away very often, apply a little thread lock to the thread. If possible, use a medium-strength fixative - “blue”.
Assembly
I bought this main bearing. It looks like our production. There are Chinese analogues in stores - they are more expensive, but I don’t know how they are in quality ... I try to take, even if not so super-duper high-quality, but at least proven over the years.
The build quality is such that there is nothing to complain about. The price is quite lifting - 350 rubles.
We press the inner race of the main bearing onto the right trunnion of the crankshaft. External - we fasten the stator flange of the dynostarter and press it into the crankcase until it rests against the flange.
We install the oil seal, retaining ring and main bearing in the left half of the crankcase. I put in a new main bearing. It is closed, but it does not matter: we open it, wash out the factory grease and install it in the crankcase.
Lubricate with clean engine oil all bearings and seal lips. And very carefully, so as not to accidentally wrap the edge of the stuffing box - we insert the crankshaft into the left half of the crankcase, and knock out the crankcase guides by 5-6mm.
We degrease the crankcase connector, lay a new gasket and install the second half of the crankcase.
We tighten the bolts and immediately so that nothing gets into the crankcase -. I put a new piston, cylinder head and reed valve body. Piston, like everything else - do not understand whose production - most likely Rostov, but obviously not Chinese. I did not want to get involved with this counterfeit, but the owner did not want to wait until the cylinder was bored and the futorka was put in the cylinder head and insisted on buying it. You see the prices for spare parts - whether or not to contact this remake is up to you.
We install the second main bearing in the crankcase and fix it with a retaining ring.