Engine Oil Pump - Operation

OPERATION






NOTE: Pump cover removed for clarity.

The gerotor type engine oil pump is part of the oil pump housing. The oil pump is directly coupled to the crankshaft.

Engine oil is drawn up from the sump through the oil pick-up tube (1). An internal mechanical plunger (2) and spring type pressure relief valve diverts excess oil from the pump outlet back to the pump inlet. The pressure controlled oil flows through the oil pump/oil filter housing interface (3) and into the oil filter housing. After the oil is filtered and cooled it travels back to the oil pump housing through the oil pump/oil filter housing interface (4) where it is routed to the main engine oil gallery (5).

The gerotor pump is not to be disassembled. The gerotor pump is a non-serviceable component of the oil pump housing and is replaced as a complete assembly. The pressure relief valve is serviceable and can be removed and inspected.