I only asked because I thought the timing cover is gasketed to the front main bearing cap as well as the block. If so then by loosening the front main bearing you have a chance for a leak between the cap and timing cover if the gasket was disturbed at all. It may seal after tightening it again, it may not, if you're lucky you're lucky if not then you know what the issue is.

Grigg

Last edited by Grigg; 01/21/2013 12:40 PM. Reason: oops, I was confused, see reply below
•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-