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Join Date: Nov 1999
Location: Santa Clarita, CA., USA
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Unhappy Compression leak on 914-6

My #3 Cyl. is squeezing air out on it's compression stroke. Valve's are moving fine and closing. I re-torqued the head, actually all three on that side. I loosend them all then torqued again. All of the nuts tighten down just fine, however when I loosen one of them it feels like the stud is spinning with the nut. I have the carb and headers off right now too.

When it happend, the engine was making a slight cherping sound, but only under load. I thought it was an intake leak. Then as I was climbing a hill near home, engine under load, something just let go. It turned from a cherp into a loud puff, puff, puff...and now always, not just loaded.

I have no experience with pulled head studs, so I don't know what to look/listen for. But I would imagine that pulled stud wouldn't be able to tighten down again.??

Any one have any ideas? - Any six experts in Santa Clarita want to come over for a beer tomorrow?
-Mike D.
Old 11-27-2004, 07:10 PM
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Sounds like you've pulled a head stud. Time to tear the motor down--at the very least it needs a top-end, and since that's about 80% of the cost of doing a full rebuild on a 911 engine... (Plus to do the case-savers and time-serts correctly you may need to tear it down the rest of the way.)

This is a big enough and expensive enough thing to fix that you really need to get a real professional expert second opinion. Take it to a 911 mechanic and see what he has to say.

--DD
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Old 11-27-2004, 08:50 PM
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