I recently bought a M farmall. Turns over but has no compression. Put a little PB Blaster and 10 W30 down the spark plug holes to see if the rings might be stuck. On the compression gauge, none of the cylinders have any compression that is measureable though you can feel compression and a little vacuum. Any ideas, am I missing anything?
- Thread starter IH Guy
- Start date
Check to make sure valves are not stuck. Pull the valve cover and rocker arm assembly easy job. Rap them with a hammer, should have a nice 'spring back to them if you get a valve that does not come back up or does not spring then you need to lube them up well and keep tapping.
Andrew
Andrew
Anonymous-0
Well-known Member
another possibility is timing gears out check by pulling dist. cap if rotor doesn't turn gears are gone, another check is if valves move when cover is off.
Janicholson
Well-known Member
I am with Andrew on this. There are probably 4 or 5 pushrods off and laying to one side. Lubing the valves through the springs with PB Blaster, waiting a day, then rapping the valve keeper with a plastic mallet gently until they begin to work loose can in some cases fix the issue. Jim
Nebraska Cowman
Well-known Member
My buddy bought a John Deere A. Not stuck. When he took the head off it had no pistons in it. Surprise!
toymaker 27
Member
valves and seats could be bad
old
Well-known Member
- Location
- Camdenton Missouri
Well first off PB and motor oil is not very good for freeing up sticking rings. Fill the cylinders with ATF and let it sit a week. In the mean time pull the valve cover off and check that it doesn't have stuck valves. Also pouring some ATF down the muffler pipe will help free things up
tractor vin
Member
also check for bent push rods ,if the valves where stuck fron sitting you can bend turning over ,I tell every one starting old sitting engine to pull cover and crank buy hand and check pushrods
Tom Fleming
Well-known Member
as others have said, stuck valves or junk cam gear. I would bet 1 of those 2 is your issue.
All the other info in this post is good, try it. Maybe someone else can explain this. I also am working with a non running M. I hooked up my pressure guage and let it dangle and tried a couple of cylinders and got zero and my heart sank, so on the next one I held the guage upright and got 100 psi. I redid the earlier ones holding the guage upright and got the same 100. I have a cheap guage and maybe was not using it correctly at first or later. Looking forward to hearing from you and others on the subject.
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