Oil filter housing
The oil pressure sensor is mounted in the oil filter housing and measures the pressure entering the engine. Oil
flow to the engine is regulated by three valves located in the oil filter housing.
1 Oil filter check valve. The function of the valve is to prevent oil draining out from the filter housing when the
engine stops.
It also provides back pressure to the oil pump.
2 By-pass valve, which regulates system pressure. Oil is returned to the oil pan.
3 Oil cooler by-pass valve. The valve has a by-pass function.
There are a further two valves in the oil filter:
There is a by-pass valve at the very top of the filter.
Below the filter is a valve that drains automatically when the filter is lifted.
20-0 Engine Information, General
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