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F-20 missing issue for you advance problem solvers
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Posted by Pete L on June 12, 2004 at 06:33:26 from (198.36.89.4):
Guys - - - Purchased a '36 F-20 last year with a missing problem in the engine. Much work has been done to cure this, but the tractor is getting the best of me and I'm about ready to shoot the dumb thing. Work done thus far is as such: new rings & sleeves, professional head rebuild, mag rebuilt, carb rebuilt, new wires & AC plugs, mag and valve timing verified by 2 other people, spark is consistand and hot, mag and carb were temporarily swapped from good running tractors with no change. All these things should result in a good running engine, but after all this work, the original missing problem is still there. It's eludeing me. Here's the symptoms: 1) engine misses 20-40% of the time, at any speed. 2) engine runs smoother at full spark retard. 3) as load is increased, engine progressively runs smoother to near perfect at full load. 4) intake manifold pressure is 10-12" Hg, and drops as the engine recovers from missed firing. 5) Adjusting carb gives engine reaction as you'd expect, but doesn't effect the missing problem. Need some help here! All of the basic stuff has been done and verified, but there's something on this engine that's still not right that I am missing. NEED HELP FROM YOU ADVANCED PROBLEM SOLVERS ! Will provide more information if you ask for it. Thanx !
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