Subject: oil leaks at engine valley M60 - Here's the full TSB Author: shogun (moderator) : member since March, 2004 : 11754 posts Posted on: 2007-12-01 22:47:46

A leak which occurs in the engine valley due to a poor sealing cylinder head gasket, valley cover gasket, etc. will allow fluid to flow toward the rear of the engine and exit the weep holes in the rear of the block. (see illustration)

From the weep holes the fluid will flow down the rear of the engine block and end up at the transmission bell housing area.

This type of engine oil or coolant leak may appear to be coming from the rear crank shaft oil seal or rear coolant channel cover since the leaking fluid exits at the transmission bell housing area.

Diagnostic Tip:

If an engine oil or coolant leak is detected at the bottom of the transmission bell housing area, the center sound absorbing engine cover should be removed first to inspect the engine valley for signs of fluid leaks.

This will avoid an unnecessary transmission removal and installation to gain access to a rear crank shaft main seal or coolant channel gasket which may not be leaking.

Thanks to fermunky for this contribution.

E32 750iL 11/88, E32 750iL Highline 03/90
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• oil leaks at engine valley M60 - Here's the full TSB (pic) - shogun 2007-12-01 22:47:46 (621 views)