Group 22 Lubrication system
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The piston cooling valve opens when engine revs have
increased to slightly above idling speed. Oil flows through
the piston cooling duct to the nozzles for the pistons. Here,
the oil is sprayed into the annular cooling channels. The
oil then passes through a duct to the bypass oil filter. This
filter has a low through- flow speed and gives a high de-
gree of filtration.
The two full-flow filters have a bypass valve which guaran-
tees lubrication of the engine should the filters become
blocked.
Oil cooler
The oil cooler maintains the temperature of the lubricating
oil at a relatively low level which is advantageous from the
point of view of wear, and also maintains the oil’s benefi-
cial qualities.
2. Bypass valve for oil cooler
3. By-pass valve for oil filter
4. Reduction valve
5. Piston cooling valve
1. Oil from the block
2. Oil from the oil cooler
3. Coolant flowing into the oil cooler
4. Coolant flowing out of the oil cooler
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