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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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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