As an engine runs, it circulates motor oil throughout the engine block to coat all of the internal moving parts. After oil lubricates the bearings and other components, it falls back down to the oil pan in the bottom of the engine to be recycled and pumped through the engine again. Many gaskets and seals help seal up the gaps between parts of the engine so that the oil stays inside the engine block where it belongs rather than leaking out.
One of these seals is called the rear main seal. Sometimes known as a crankshaft main bearing seal, it takes up the gap between the spinning crankshaft and the engine block or oil pan flange at the rear of the engine.
The primary sign of a bad rear main seal is an oil leak from the engine. Your engine might need this seal replaced if you notice one or more of the following:
Rear main seal replacement requires significant access to your engine. In some cases, the engine might have to be partially or completely removed to allow access to the rear main seal. If this is necessary, repair times will be longer and include more steps.
To replace the rear main seal, a technician will generally perform the following steps:
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