Hello dear site visitors. In this article, we will tell you about Mitsubishi Lancer 9 engine. Consider its structure, design features of engines 1.3 1.6 and 2.0 liters.
Design features of the Lancer 9 engine.
Mitsubishi Lancer cars are equipped with transversely mounted four-cylinder four-stroke petrol injection 16-valve engines with a working volume of 1.3; 1.6 and 2.0 l mod. 4G13, 4G18 (both SOHC type engines) and 4G63 (DOHC type), respectively.
SOHC - Engine with one camshaft and valves in the head (Single OverHead Camshaft).
DOHC - engine with two camshafts in the cylinder head (Double OverHead Camshaft).
R is. 1. The cylinder head of the engine SOHC 1.3 and 1.6 liters: 1 - inlet valve; 2 - inlet valve seat; 3 - valve guide sleeve; 4 - support washer of the valve spring; 5 - oil scraper cap; 6 - valve spring; 7 - valve spring plate; 8 - cracker; 9 - hydraulic gap compensator in the valve drive mechanism; 10 - the axis of the rocker arms of the intake valves; 11 - inlet valve rocker; 12 - camshaft; 13 - exhaust valve rocker; 14 - axis of rocker arms of exhaust valves; 15 - exhaust valve seat; 16 - exhaust valve; 17 - cylinder head; 18 - cylinder head gasket
All engines with in-line vertical arrangement of cylinders, liquid-cooled. Parts and assemblies are shown on the example of the 4G18 engine (Fig. 1 and 3). Engine mod. 4G13 has a completely similar design and differs from mod. 4G18 only working volume. The main difference between the 4G63 engine and the other two is in the design of the cylinder head (Fig. 2), the oil pump and the crankshaft main bearing block. In addition, two balancing balance shafts have been introduced into the design of the 4G63 engine to reduce vibrations.
Rice. 2. The cylinder head of the engine DOHC 2.0 l.: 1 - inlet valve; 2 - inlet valve seat; 3 - valve guide sleeve; 4 - support washer of the valve spring; 5 - oil seal cap; 6 - valve spring; 7 - valve spring plate; 8 - cracker; 9 - front cover of the camshaft bearing; 10 — a bolt of fastening of a cover of the bearing of a camshaft; 11 — an average cover of the bearing of a camshaft; 12 - intake camshaft; 13 - rear cover of the exhaust camshaft; 14-screen phase sensor; 15-outlet camshaft; 16-push valve lever; 17 - hydraulic gap compensator in the valve drive mechanism; 18 - cylinder head; 19 - exhaust valve seat; 20 - exhaust valve; 21 - cylinder head gasket
Mod engines. 4G13 and 4G18 (SOHC) with a capacity of 60 kW (82 hp) and 72 kW (98 hp), respectively, with an overhead arrangement of one five-bearing camshaft, have four valves per cylinder. Engine mod. The 99 kW (135 hp) 4G63 (DOHC) also has four valves per cylinder, but is fitted with two identically designed six-point camshafts. The camshafts of both engines are driven by reinforced toothed belts, and the gaps in the valve drive are eliminated by hydraulic compensators operating on the same principle and connected by channels to the lubrication system. The valves of SOHC engines are driven from the camshaft using rocker arms, which have rollers on one shoulder that contact the camshaft cams, and on the other, hydraulic gap compensators acting with their plungers on the ends of the valve stems. Exhaust valve rockers are double fork-shaped, each actuating two valves; the rocker arms of the intake valves of these engines are single, each of them acts on only one valve. The valves of the DOHC engine are driven from the camshafts through pressure levers that interact with the camshaft cams through the rollers and rest at one end on the ends of the valve stems, and at the other end on the hydraulic compensators screwed into the head of the block, which act as lever supports.
Rice. 3. Cylinder block, crankshaft and SOHC engine flywheel: 1 - cylinder block; 2, 5.10, 12.16, 22 - bolts; 3 — a back epiploon of a cranked shaft; 4 - upper front cover of the clutch housing; 6.15 — flywheel mounting sleeve (drive disk); 7 - remote washer; 8 - flywheel; 9, 13 - washers of bolts for fastening the flywheel (drive disk); 11 - lower front cover of the clutch housing; 14 - torque converter drive disk (installed with an automatic transmission); 17 — the holder of a back epiploon of a cranked shaft; 18 — the top loose leaf of the radical bearing; 19 - crankshaft; 20 — the lower loose leaf of the radical bearing; 21 - main bearing cap
The cylinder heads of both types of engines are made of aluminum alloy according to the transverse cylinder scavenging pattern (inlet and outlet channels are located on opposite sides of the head). Seats 2 and 15 are pressed into the heads (see Fig. 1) and valve guides 3. The inlet 1 and outlet 16 valves each have one spring b, fixed through the plate 7 with two crackers 8.
On the upper plane of the head of the SOHC engine block, the axles 10 and 14 of the rocker arms of the intake 11 and exhaust 13 valves are bolted. In the sockets in the arms of the rocker arms, resting on the ends of the valve stems, hydraulic compensators 9 of the gaps in the valve drive mechanism are installed. Camshafts 12 and 15 (see Fig. 2) of the head of the D0HC engine block are installed in the bearing bed, made in the body of the head, and secured with covers 9,11 and 13. Camshaft cams act on pressure levers 16, which at one end rest on hydraulic compensators 17 gaps in the valve drive mechanism, and the other ends of the moving valves. The plane of the separation of the head and cylinder block is sealed with a gasket 18 (see Fig. 1) or 21 (see Fig. 2) from two plates molded from thin sheet metal and welded together by spot welding. Cylinder blocks 1 (see Fig. 3) of engines of both types are a single casting that forms the cylinders, the cooling jacket, the upper part of the crankcase and five crankshaft bearings made in the form of crankcase partitions. The blocks are made of special high-strength cast iron with cylinders bored directly into the body of the block. The 21 main bearing caps, machined complete with blocks, are not interchangeable. Moreover, the covers of the main bearings of the SOHC engines are made each separately, and for the DOHC engine they are combined into a common support in the form of a frame. On the cylinder blocks there are special lugs, flanges and holes for fastening parts, components and assemblies, as well as channels of the main oil line. In the cylinder block of the DOHC engine, among other things, bearing beds for two balancer shafts are made. The crankshaft 19 (see Fig. 3) rotates in main bearings with thin-walled steel liners 18 and 20 with an anti-friction layer. The axial movement of the crankshafts of SOHC engines is limited by special flanges made on the middle main journal and resting on the shoulders of the thickened middle main bearing shells. The crankshaft of the DOHC engine is fixed from axial movements by two half rings installed in the grooves of the bed of the middle main bearing. The flywheel 8 (see Fig. 3), cast iron, is mounted on the rear end of the crankshaft through the mounting sleeve 6 and secured with six bolts through the washer 9. A toothed rim is pressed onto the flywheel to start the engine with a starter. Due to the fact that the flywheel is made rather thin, a distance washer 7 serves to reinforce it, and nuts are welded for this purpose instead of threaded holes for fastening the clutch pressure plate casing on the rear surface of the flywheel. On cars with an automatic transmission, instead of a flywheel, a driving disk 14 of the torque converter is installed. The pistons are made of aluminum alloy. On the cylindrical surface of the piston head there are annular grooves for the oil scraper and two compression rings. The pistons are additionally cooled by oil supplied through the hole in the upper head of the connecting rod and sprayed onto the piston crown.
The piston pins are installed in the piston bosses with a gap and are pressed with an interference fit into the upper heads of the connecting rods, which are connected by their lower heads to the connecting rod journals of the crankshaft through thin-walled liners, the design of which is similar to the main ones.
Connecting rods are steel, forged, with an I-section rod.
The balance shafts of the DOHC engine are used to balance the forces of inertia during the rotation of the crankshaft and thereby reduce vibration during engine operation. The shafts are driven by a toothed belt from the toothed pulley of the crankshaft.
Combined lubrication system.
The closed crankcase ventilation system does not communicate directly with the atmosphere, therefore, simultaneously with the exhaust of gases, a vacuum is formed in the crankcase under all engine operating modes, which increases the reliability of various engine seals and reduces the emission of toxic substances into the atmosphere.
The system consists of two branches, large and small. When the engine is idling and in low load modes, when the vacuum in the intake pipe is high, crankcase gases are sucked in by the intake pipe through the crankcase ventilation valve installed on the cylinder head cover. The valve opens depending on the vacuum in the intake pipe and thus regulates the flow of crankcase gases.
In full load modes, when the throttle valve is open at a large angle, the vacuum in the intake pipe decreases, and in the air supply hose it increases, crankcase gases through a large branch hose connected to a fitting on the head cover of the block, mainly enter the air supply hose, and then through the throttle assembly into the intake pipe and into the engine cylinders.
The engine cooling system is sealed, with an expansion tank, consists of a cooling jacket made in casting and surrounding the cylinders in the block, combustion chambers and gas channels in the cylinder head. Forced circulation of the coolant is provided by a centrifugal water pump driven by a crankshaft poly V-belt, which simultaneously drives the generator. To maintain the normal operating temperature of the coolant, a thermostat is installed in the cooling system, which closes a large circle of the system when the engine is cold and the coolant temperature is low.
The power supply system of both engines consists of an electric fuel pump installed in the fuel tank, a throttle assembly, a fine fuel filter located in the fuel pump module, a fuel pressure regulator, injectors and fuel lines, and also includes an air filter .
The ignition system of both engines is microprocessor-based and consists of ignition coils, high-voltage wires and spark plugs. The ignition coils are controlled by the electronic engine control unit. The ignition system during operation does not require maintenance and adjustment.
The power unit (engine with gearbox, clutch and final drive) is mounted on four supports with elastic rubber elements - two upper side (right and left), perceiving the main mass of the power unit, and rear and front lower, compensating torque from the transmission and load arising when starting the car from a standstill, accelerating and braking.