Leakage Points

Examine the following areas for oil leakage:
^ Valve cover gaskets.
^ Intake manifold gaskets.
^ Cylinder head gaskets.
^ Oil bypass filter.
^ Oil filter adapter.
^ Engine front cover.
^ Distributor O-ring.
^ Oil level indicator tube connection.
^ Oil pressure sensor.
^ Oil pan gaskets.
^ Engine front cover gasket.
^ Crankshaft front seal.
^ Crankshaft rear oil seal.
^ Crankshaft main bearing cap side bolts.

With Transmission and Flywheel Removed
NOTE: Air leakage in the area around a crankshaft rear oil seal does not necessarily indicate a crankshaft rear oil seal leak. However, if no other cause can be found for oil leakage, assume that the crankshaft rear oil seal is the cause of the oil leak. Light foaming equally around the valve cover bolts and the crankshaft seals is not detrimental; no repairs are required.

^ Crankshaft rear oil seal.
^ Rear main bearing cap parting line.
^ Rear main bearing cap and seals.
^ Flywheel mounting bolt holes (with flywheel installed).
^ Camshaft rear bearing covers and/or pipe plugs at the end of oil passages.

Oil leaks at crimped seams in sheet metal parts and cracks in cast or stamped parts can be detected when pressurizing the crankcase.