Oil Pump

Oil Pump:

The S54 oil pump is two stage, supply and scavenge. The pump is driven by the crankshaft with a single row chain.




The oil pump has two separate chambers, the scavenge chamber (1) draws oil from the pickup at the front of the oil pan. The oil is transferred from the pump through a small pipe to the main sump at the rear of the oil pan (2).

The supply chamber (3) draws oil from the main sump through a large pipe (4) to supply oil to the main gallery. The main gallery circuit returns to the pump housing which contains the oil pressure control piston.







The oil pressure is tested at the oil filter housing using the Special Tool #90 88 6 114 390 (adapting retainer bolt and pressure gauge as shown in the Repair Instructions).







The adapter retainer bolt replaces the oil filter housing cover retaining bolt and provides an adapter fitting for the oil pressure gauge.