Burned oil around exhaust valve


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Posted by David Sherman [24.32.202.83] on Friday, May 14, 2010 at 14:46:31 :

I think I mentioned before I'm working on the slant 6 in the old mine tour trolley. It had lots of small things wrong with it but the big one is no compression on #4 cylinder. This might also be why the automatic choke wasn't shutting off since the bimetallic coil is in a pocked on the #4 leg of the exhaust manifold. I'm hoping I can just pull the head, get the valves done, and have the engine be good. I suspect the timing chain and/or distributor gear are wearing out because I have to turn the distributor to maximum advance to get it to run well, and even then it never knocks under load.

Anyway, today's puzzle is that with the valve cover off, I see that the oil on top of the head is black and burned (coked) all around #4's exhaust valve. The rocker arm clearance on that valve is almost nothing, which confirms my opinion that it is burned. What puzzles me is why the head around the exhaust valve would overheat and coke the oil on it. It seems to me that with no compression in that cylinder, it shouldn't even fire, but if it did fire, it would heat up the automatic choke coil in the #4 leg of the exhaust manifold, which it appears not to be doing. Why would the oil on the head around the exhaust valve of a no-compression cylinder be burnt? Is this a sign that the head is now warped?



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