Engine Lubrication: Description and Operation

Oil is drawn from the sump via a gauze filter. Pressurized oil, having been regulated by a relief valve, is then fed via internal galleries on the LH side of the cylinder block. An adaptor block is fitted between the cylinder block and the oil filter housing which diverts the full oil flow through the oil cooler prior to filtering. A balance valve is fitted which bypasses the oil cooler circuit when a pressure differential of 10 to 15 psi occurs.

Pressurized and filtered oil is fed into the main oil gallery, the seven main bearings are fed and thence via crankshaft drillings to the big end bearings.

The intermediate shaft, auxiliary shaft and camshaft bearings are pressure lubricated by means of internal drillings directly fed from the front of the main oil gallery.


NOTE: Oil coolers are specified on all models to date, but if at any time a cooler is not required, then the oil filter housing can be bolted directly to the cylinder block through omitting the oil cooler adaptor.