1. Oil dripping on the cylinder head; 2. Main oil line; 3. Oil injection for piston cooling; 4. Full flow oil filter; 5. Oil radiator.
The engines are equipped with a so-called closed pressure lubrication system. The oil pump sucks engine oil from the oil pan through a mesh filter and delivers it to the oil filter. On the discharge side of the pump is an oil pressure relief valve. If the oil pressure is too high, the valve opens and some of the oil returns to the oil pan.
The middle section of the oil filter directs the filtered oil directly into the main oil line. The oil pressure indicator light switch is also located there, which informs the driver of too low oil pressure via a warning light on the instrument panel. If the oil filter becomes clogged, the bypass valve directs unfiltered oil directly into the main oil line.
The main oil line has channels for lubricating the crankshaft bearings. Oil is supplied to the connecting rod bearings through oblique holes in the crankshaft. To cool the piston bottoms, oil is injected from below onto the pistons.
At the same time, oil is supplied through channels in the cylinder head and from there it goes to the camshaft bearings and valve tappets.
[Data provided by the website: MAZBOOK]
On the 1.3L engine, the drive chain and camshaft sprocket are lubricated through a hole in the front channel.
Depending on the version, the oil is cooled in a heat exchanger on the oil filter flange, which is connected to the engine cooling system.