Posted by Jim Stordahl on June 13, 2014 at 08:26:05 from (66.219.8.179):
Over the years, I posted questions of problems with my “experienced” tractors and you have never failed to solve the problem. I have another one and hope you help solve this mystery.
I have a 1948 M with a 325 Dual loader, Schwartz front end with full PS and an add-on two speed splitter which gives me the ideal forward and reverse speeds for picking up round bales after harvest – it’s primary job around the farm. It’s a perfect job for this tractor and I love being in the fresh air after baling.
Here’s the problem… The engine does not run smooth. When it idles, it sounds like its missing, it’s a bit better a low-mid range rpm, worse at higher rpm. When I put it under a bit of a load (I grab a bale and take off quickly, going uphill), it seems to smoothen out and sounds like it’s hitting on all four. When the “pressure” is off, it’s back to running uneven.
I have changed plugs (not wires), which has not helped. I have gone through the carb, no difference. Someone suggested a bad valve so I checked compression on each cyclinder – all four are equal, all hold (for at least 10 sec) and have about 80 psi – so not sure if it’s a sticky valve. Is this a correct assumption?
Another clue… The temp guage shows it runs cool, and I assume the guage works. If I forget the winter cover on front, it will get hot. When I get the temp up, it does seem to run better. When I’m in the field, the guage shows it to be below normal temps. Could I have a bad thermostat? Would that explain the symptoms?
Someone else suggested a leak in intake manifold, would that create these symptoms? Could it be multiple problems? Any other ideas?
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