The Ford Barn - View Single Post

Terry Burtz, Calif · 12-14-2013, 01:22 PM

Hi Eric,

We had one leak because the seal rubbing surface was not concentric with the rear main bearing.

With engine stopped and inverted on an engine stand, we pressurized the rear main drain tube to 60 psi and there was no leak.

The engine would not leak around town (up to 40 mph).

The engine leaked at high speed (over 40 mph).

At slow speed the seal lip was able to flex and maintain contact with the seal rubbing surface. At high speed the seal lip was whipped out and was unable to maintain contact with the seal rubbing surface.

12-14-2013, 01:22 PM	#10
Terry Burtz, Calif Senior Member Join Date: May 2010 Location: Campbell,CA, USA Posts: 319	Re: strange rear oil leak, advice needed Hi Eric, We had one leak because the seal rubbing surface was not concentric with the rear main bearing. With engine stopped and inverted on an engine stand, we pressurized the rear main drain tube to 60 psi and there was no leak. The engine would not leak around town (up to 40 mph). The engine leaked at high speed (over 40 mph). At slow speed the seal lip was able to flex and maintain contact with the seal rubbing surface. At high speed the seal lip was whipped out and was unable to maintain contact with the seal rubbing surface.