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Tractor Pulling Discussion Forum

low compression

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jdjack

08-10-2006 16:53:50




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I have a 44 A. It is a hand start. Checked compression on left cylinder 45-50 psi hard to turn over. Checked on right side, 25 psi easy to turn over. Throttle was open and engine cold. I bored it and installed .125 alum pistons a few years ago. Not many hours on engine. What should the compression be when I spin this by hand. Was thinking of pulling it with another tractor and checking it.




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B-maniac

08-12-2006 21:16:25




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 Re: low compression in reply to jdjack, 08-10-2006 16:53:50  
People put too much credence in the compression test. There are too many variables in the way different people do it. The wide range of "acceptable" results doesn't really tell you a lot. Is your tractor running badly or are you just wanting to check the rings you put in to see if they are seating in? The BEST thing to do to tell the condition of any engine is to run a leak-down test on it. Take out the plugs,Put one cyl. on TDC (compression--both valves closed),install an air fitting in the spark plug hole and put abt. 60-80# of air pressure to it. Liston to where you hear air escaping excessively. Out the exaust--exhaust valve leaking. Out the breather--intake leaking.Out the crankcase ventilation tube or oil filler or wherever the crankcase is vented--worn rings or piston problem.Out of the radiator--you've got big time problems.Do the same on the other cylinder. I'm sure you already have heard of this but it sure makes more sense than trying to do a compression test on a hand start tractor. Let us know what you find out.

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