Engine Lubrication: Description and Operation

The oil distribution in the L81 engine is as follows:
^ Suction from the crankcase via the oil intake pipe to the oil pump
^ Oil pump to the engine oil cooler
^ Engine oil cooler to the oil filter
^ Oil filter to the following:
- Main bearings 2,3 and 4
- Oil pressure regulating valve and the number 1 main bearing
- Cylinder heads, camshafts and lifters
- Oil ventilation nozzles in the cylinder heads
^ Oil return galleys
^ Crankcase
In the event that there is a restriction in the oil cooler lines, the oil pump will bypass the cooler to provide adequate lubrication.