No power H

Farmall H, HV & Super H, 300 & 350, 1939-1958

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Dusty B
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No power H

Postby Dusty B » Tue May 05, 2020 3:50 pm

Carb has been rebuilt twice - last time by IH shop! Has no power under load, w/die down almost completely, then RPM's w/pcik back up but still no power. Ajusting needle valve does no good! Had complete tune up is shop last fall.. :help:
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ricky racer
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Re: No power H

Postby ricky racer » Tue May 05, 2020 4:23 pm

Dusty, can you do a compression test? Maybe the valves are not closing due to carbon buildup. Maybe the valves are out of adjustment. A quick dry/wet compression test will tell you the general health of the motor.
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John *.?-!.* cub owner
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Re: No power H

Postby John *.?-!.* cub owner » Tue May 05, 2020 9:05 pm

This may be a stupid question, but have you checked the timing?
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pokitisme
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Re: No power H

Postby pokitisme » Wed May 06, 2020 2:39 pm

Mine is doing the same thing I took it to a tractor shop named Bates City tractor in Missouri they're giving me a whole load of stuff about the engine needs to be completely rebuilt. I got the impression that they're being very shady.. the compression on the tractor has been the same since I first got it when it was operational. But now under load it will either die or has absolutely no power.
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Re: No power H

Postby Eugene » Thu May 07, 2020 10:31 pm

Dusty. Do it yourself, double check with a complete engine tune up. I'm with John, my guess is that something happened to the ignition timing, ignition system. Replace the coil with a known good one and the condenser.

Tractors/engines will some times run with a faulty condenser, just like crap. A quicky check for faulting condenser is to observe the arc at the points when cranking over the engine, ignition on. Yellow spark, faulty condenser.
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Re: No power H

Postby KETCHAM » Wed May 20, 2020 2:34 pm

OK....here is what guys at the tractor pull told me.....condensation drops down the exhaust pipe...rusts over time....puts a hole between the exhaust and intake....so your fuel air mixture gets less fuel and more air...also heats up and the hole gets bigger..Might want to check.....I just bought a manifold[about $200.00] tractor has a flat so no results yet...runs better and sounds better...compression was good...timing good...power got worse every year....valves adjusted....Kevin
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