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Possible bad exh manifold gasket? 700 1988

posted by  Erwin on  Fri Feb 28 05:44 CST 2003
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last visit: Thu Oct 23 10:39 CST 2014
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Well my 745t project-car/daily-driver is living up to expectations. For the price I knew I'd have some work to do. Thank God I have a garage.

I might have what I think is a bad exhaust manifold gasket or maybe it's the spark plug hole.

I hear the "snap" or "tick" when the boost guage nears 11 o'clock and it intesifies the higher the boost. If I short shift and keep it out of boost it isn't noticeable.

At 2000rpm the sound occurs at about a 15 cyles/sec which would be about right for a leak at the ex port / manifold junction or a plug leak.

I know I have a buggered up spark plug thread in the #3 cylinder. When I pulled the plugs to check them after buying the car, #3 was hard coming out. I found that it's crush washer wasn't compressed and it couldn't be run in far enough to seat it properly.

The sound didn't start until after I pulled the plugs so it could also be pressure escaping past the #3 plug.

Looking at the plug's seat and hole it's apparant that a plug hasn't seated properly there for a while. I've been emailing a couple of guys about chasing the threads with the proper tap but I think the sealing surface needs to be dressed as well. Of course I'd like to do all this without pulling the head. Any tips?

Thanks,

--
Erwin in Memphis, '88 745t 183,000 miles, '95 855t For Sale






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