IH 460 misfiring

I just had a problem with my 1959 IH 460U. I went overboard with the solutions, but it is working well now, except I have to time the thing and there are no marks left on the crankshaft pulley.

There is a weighted shutter between the intake and exhaust manifold. The shutter basically diverts exhaust gases to preheat the intake manifold when the engine is cold. I suspect the intake manifold getting hot keeps the attached carburator from icing up. On the outside of the manifold should be a small shaft with a spiral spring. As the spring warms up, the shutter is opened so exhaust gases no longer warm the intake manifold. That little piece of spring cost about $25 (ouch). Anyway, the weight should be reachable behind and just visible above the exhaust manifold. See if it is moving freely and that it moves as the engine warms up.

I hope this helps.

Doug Stockman
Penfield, NY

Real easy way to tell if a miss is fuel related or electrical related is to use a shot of propane in the intake.

A small coleman LP tank and needle vavle with a hose ran to the intake works well.

It the miss goes away when LP is added then it's fuel related.

If not then it's electrical or mechanical.

T_Bone