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TTVN, Performance & diagnostic technition
Category: Car
Satisfied Customers: 184
Experience:  Motor Mechanic for 18 years, specialising in diagnostics, tuning, engine building, LPG ,Turbos etc
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Whats causing oil leak in rear of my 7.3 2002 ford truck

Resolved Question:

what's causing oil leak in rear of my 7.3 2002 ford truck
Submitted: 6 years ago.
Category: Car
Expert:  TTVN replied 6 years ago.
Hi there
When you say rear of your truck is it the rear of the engine or the final drive differential assembly

Thanks Rod
Customer: replied 6 years ago.
leaking appears to b e from the engine.
Expert:  TTVN replied 6 years ago.
Ok thanks for the quick response
If it only appears to be oily under the engine and not on top or running down the back it sounds like either your sump gasket or rear main seal is leaking

Run your fingers carefully around the back of the cylinder heads and manifold to make sure it isn't the rocker cover gaskets leaking

Generally if it's clean up top it is either the sump gasket or the rear main seal

usually the sump will leak external to the bellhousing cover and the rear main seal will leak internally inside the bellhousing and drip out the bottom.

If the rear main seal is leaking check for excessive blowby and check to make sure the engine breathers are ok as excessive crankcase pressure will push oil out the seals

If crankcase pressure is not an issue then you will need to replace the seal

thanks Rod
Customer: replied 6 years ago.
how hard is it to change the rear main seal
Expert:  TTVN replied 6 years ago.
Either the engine or transmission will need to be removed to gain access to change it in behind the flywheel

If yours is a manual you may consider replacing the clutch when doing the seal as a preventative measure and to save labor on doing the clutch down the track

thanks Rod
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