Yaroslavl Engine Plant YMZ-536, Operation Manual, Page: 86 / 168

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A
18
Fig. 27. Arrangement of channels in the service module:
1
– cooling liquid feed pipe from the vehicle radiator;
2
– suction cavity;
3
–
thermostat;
4
– oil outlet channel from the L/O HE element;
5
– L/O HE
element oil feed channel;
6
– oil filter;
7
– clean oil outlet from the oil filter;
8
– oil feed channel to the oil filter;
9
,
13
– L/O HE bypass channels;
10
,
11
–
oil feed channel from the block;
12
– service module housing;
13
– water
pump inlet pipe;
14
– water pump volute;
15
– water pump housing;
16
– water
pump pulley;
17
– water pump drive spindle;
18
– drain hole A – end seal (see
Fig. 25);B – L/O HE safety valve (see Fig. 27a)
In the service module the L/O HE is open, but when the service
module is mounted onto the engine, the heat-transferring element
becomes confined in the closed cavity formed by the module and the
cylinder block wall.
The L/O HE element receives the whole volume of the cooling
liquid supplied by the water pump. After the L/O HE, the cooling
liquid goes to the cylinder head through 2 channels in the block and
cylinder head.