Posted by Eric Bergstrom on July 26, 2009 at 22:15:51 from (98.240.239.156):
I spent most of this weekend trying to figure out the reason my W-4, which has an identical engine to an H Farmall, (in case anyone didn't know already) keeps losing compression when it's hot. It will run PERFECTLY when first started and operated, but then as it warms up, it will eventually begin to miss and die. Even if you shut if off before it gets hot enough to act up, it will spin over way too fast (for what a normal 6 volt system would do) and not start without a pull.
Anyway, I started by replacing my valve springs, as they seemed quite weak (although the new ones from Case IH didn't seem all that much stiffer).
Then, I tested the compression and it ranged anywhere from 45 psi to 75 psi per cylinder. I then compared that to my H, which works perfectly, I found that it has 110 psi across the board.
This obviously raises red flags. However, I'm uncertain how to know if it's my rings or my valves causing the problem.
The engine does not smoke at all. It also runs perfectly at high or low RPM when it's not too hot. I would have thought that bad rings would cause smoking and bad valves would have caused a rough idle. I could hear air escaping in some of the cylinders when I had them under pressure to replace the valve springs.
Also, it has a mag, which seems to put out good spark. Sorry for the long novel of a post, but I'm stumped and I don't want to fix one "problem" only to find out it was being caused by something else.
Any input would be greatly appreciated and thank you for your time!
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