Cruze

Lubrication Description

The system includes a light alloy aluminium sump. The oil suction pipe is included in the crankshaft balancer.

The oil pump is included in the crankshaft balancer and pulls oil from the oil suction pipe through the lower passage in the engine block. The oil pump then directs the flow of pressurised oil back through the upper passage in the block to the right side of the engine block where the oil filter adapter and engine oil cooler are mounted.

The oil filter adaptor and the engine oil cooler are mounted with a gasket to the right rear side of the engine block. The oil filter adapter incorporates a bottom-access, spin-on oil. Oil flows through the lower passage in the oil filter adaptor and through the oil filter. Filtered oil travels back through the upper passage of the oil filter adapter and back into the engine block.

Oil is directed up and across the engine block front through several drilled passages that feed oil to the cylinder head, oil to the passage for the main bearings and piston oil nozzles.

Each cylinder head passage directs oil into the cylinder head where it is directed to oiling circuits for the stationary hydraulic valve clearance adjusters, the valve rocker arms and the camshaft bearing journals.

The oil passage that supplies oil to the main bearings also supplies oil to the piston-cooling oil nozzles. Each oil nozzles is mounted between opposing cylinder bores and directs oil to the bores to provide extra cooling and control piston temperatures.

Oil returns to the sump the cast oil drain back passages on the outboard walls of the cylinder heads and engine block.