Farmall H no load engine miss/kinda long

Anonymous-0 · Nov 29, 2010

Got a problem with my H since I bought it,it has a no load miss & will run correctly on a little pull or when you open throttle & about 30 seconds after you start it. a little info on what i have done, it had a cracked head, but ran same way when i bought it.
had another head reconditioned,Pressure checked block, adjusted valves, rechecked clearance at least 3 times, carb. actually i have an extra carb & rebuilt both, same on both. new plugs twice now have 3116 Autolites in it, new points,condenser, wires, cap & rotor, switched dist with a buddy, no help.
checked cam lobes,O.K. it has aftermarket manifold on it, i took it off & checked for internal cracks with water. seems ok. no leaks.
checked around new manifold gaskets many times for leaks. Also after running a short time the 2 outside plugs are firing good, but 2 inside ones are all sutted up. Anymore ideas guys?

CJ_1080 · Nov 29, 2010

Are the spark plugs fouling because of oil, or over fueling? Also, I never liked 3116 plugs. Maybe try a set of 386 or 388 if you like autolites, or D19 or D21 for champions. The higher number of both being the hotter plug.

Janicholson · Dec 1, 2010

If it were mine (and i had invested as much time in it as you) I would replace the manifold with a IH used original. Though it would not be the easiest replace to check solution, it would make sure the manifold was distributing fuel correctly. I assume the load screw has been adjusted to attampt to clear it up with no success. Jim

mkirsch · Dec 1, 2010

Compression check?

rustyfarmall · Dec 1, 2010

The 2 inside plugs being sooted while the 2 outside plugs are clean tells me something, but I'm not sure yet what it is telling me. The manifold has only 2 intake runners. One of the runners feeds cylinders 1 and 2, and the other runner feeds cylinders 3 and 4, or in other words, each runner feeds an outside as well as an inside cylinder, so I don't think the manifold is at fault. (I could be wrong)

My little pee brain is telling me that maybe there is a problem with the exhaust valves on the 2 inside cylinders? Maybe they are not closing completely? Or adjusted incorrectly?

My thoughts also keep coming back to the possibility of a worn distributor, and yes, I know you already tried a different distributor, but I still can't rule it out.

Anonymous-0 · Dec 2, 2010

Thanks Guys! The manifold is my next idea, Son has been looking for a Original IH one, Had a friend who had an aftermarket Manifold that was made wrong. We have tried everthing, also compression is good & even around 100 on all cyls. carb is adjusted correctley many times, have some good farmall mechanics around here,(I Think) & they are stumped. Have always prided myself by making these old tractors run, this has got me stumped. thanks again for your help.

Anonymous-0 · Dec 2, 2010

Also the aftermarket manifold, probably Chinese is the one that fits a H & super H, plus others that has the bigger carb. intake hole with bolt slots for a bigger carb. Thanks

Farmall H no load engine miss/kinda long

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