The oil flow is controlled according to the temperature. In the upper filter housing there is a thermostat, to which the valve is pressed by a spring. Depending on the oil temperature, the valve opens or closes the channels through which oil enters either the oil cooler or the lower filter housing. On fig. 105 and 106 show sections of filters for 6 and 8-cylinder engines.
Pic. 105. Section of the oil filter of a six-cylinder engine.
1 - spring,
2 - thermostat,
3 - sealing ring,
4 - cork,
5 - upper filter housing,
6 - spring,
7 - check valve,
8 - lower filter housing,
9 - filter element,
10 - elastic support,
11 - sealing ring,
12 - sealing ring,
a - oil output,
c - oil inlet,
c - channel in the filter housing,
d - channel in the filter housing.
Pic. 106. Section of the oil filter of an eight-cylinder engine.
1 - central bolt,
2 - sealing ring,
3 - filter cover,
4 - sealing ring,
5 - oil filter housing,
6 - filter element,
7 - fitting,
8 - pipe,
9 - the place of installation of the pressure sensor,
10 - thermostat,
11 - valve,
12 - valve seat,
13 - spring support,
14 - check valve,
15 - spring,
16 - spring,
17 - bottom seal of the filter element,
A - crude oil to the oil cooler,
B - crude oil from an oil cooler,
a - from the oil pump,
c - to the main bearings of the crankshaft,
c - drain into the oil sump.
When overhauling the engine after a run of 1000... 1500 km, the filter element must be replaced. To replace the filter element, unscrew the lower filter housing. To remove the oil filter from the engine, perform the following work:
Six-cylinder engines
Remove intake manifold.
Unscrew the central bolt of the lower housing and lower the filter down.
Remove sealing ring.
Thoroughly clean the split surfaces of the filter housing and cylinder block from gasket residues, preventing them from entering the oil channels.
Install a new oil filter with a new gasket on the engine, wrap and tighten the four mounting bolts. When installing the gasket, make sure that the gasket does not block the oil passages.
Start the engine and check the filter for leaks.
Check engine oil level and top up if necessary.
Eight-cylinder engines
Unscrew the filter cover. Disconnect the two oil outlet pipes to the radiator, unscrew the fitting between the filter housing and the shock absorber.
Disconnect plug from oil pressure sensor.
Loosen the mounting bolts and remove the filter.
If necessary, remove the filter element.
Clean the mating surfaces of the filter housing and cylinder block from gasket residues, preventing them from entering the oil channels.
Install a new filter element and cover with a new O-ring. Screw in the central bolt and tighten to 30 Nm.
Install the filter with a new gasket on the engine and tighten the mounting bolts to 25 Nm.
Perform the rest of the work in reverse order. Check engine oil level and top up if necessary.