Posted by kopeck on May 21, 2013 at 08:16:39 from (64.45.111.241):
Ah...a loaded question for sure.
I've written here a few times about my poor Farmall A that just plain runs uneven. I really don't want to address that right now as I've done it already and I have a plan of attack to try and find the culprit.
None the less, while I'm waiting for my manifold gaskets to arrive I thought I would ask about compression.
Part of my trouble shooting I checked the compression. Each hole gave me a reading of 93/94 PSI warm.
This is on a gas tractor that has had it's head rebuilt probably about 30 hours ago. I also installed new rings at the the time. I honestly didn't know what I was doing, I was just learning about engines at the time so it all seemed like a good idea. The liners didn't look all that bad but today, knowing that for a few more dollars and a bit more labor the liners would have been replaced too.
According to data I found on Webster's site 102 PSI is speced for the C113 gas engine. I haven't a clue if that is suppose to be a hot reading or a cold one. Mine did read a bit lower cold.
With new rings, even in old liners does 93PSI seem a bit low or about right. It doesn't smoke, at least enough that's noticeable. When it was running well it drove my woods mower deck just fine.
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