Engine lubrication system — general information

The lubrication system is combined - under pressure and splashing. Under pressure, the main and connecting rod bearings of the crankshaft, the camshaft and auxiliary drive shaft bearings, the camshaft cams and the oil pump drive gear bushing are lubricated. Oil flowing from the gaps and sprayed by moving parts lubricates the cylinder walls, pistons with piston rings, piston pins in bosses, the timing chain, valve lever bearings, and valve stems in their guide bushings. The oil pressure on a warm engine at an average crankshaft speed is 3.5–4.5 kgf/cm²; When the oil pressure drops to 0.4–0.8 kgf/cm² The low pressure indicator in the instrument cluster comes on. The lubrication system includes: an oil pump, a suction pipe with a filter mesh attached to the pump housing; full-flow oil filter mounted on the left side of the engine; filler neck with lid; oil level gauge (probe) in the crankcase; low oil pressure sensor connected to the indicator lamp.

The oil pump is a gear type with helical gears to reduce oil pressure pulsation, is installed inside the crankcase and is attached to the cylinder block with two bolts. The drive gear is fixedly fixed on the roller. The driven gear rotates freely on an axle pressed into the pump housing. An oil inlet pipe with a filter mesh and a built-in pressure reducing valve is attached to the pump housing, which is pressed against the pump cover by a spring. The valve actuation pressure is provided by a spring of appropriate elasticity.

The oil filter is full-flow, non-separable, equipped with bypass and anti-drain valves.


The crankcase ventilation system is closed, forced, with exhaust gases through the oil separator.

Power supply, cooling and exhaust systems are described in the relevant chapters.

The dimensions of the main mating parts of the engine and the limits of permissible wear in operation are given at the end of the chapter.