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Farmall & IHC Tractors Discussion Board

Farmall M miss on one cylinder, oil seeping from intake port


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Posted by scruffyia on November 25, 2012 at 14:54:23 from (71.7.53.63):

Yesterday when I started the old 1947 M to pull some stakes out of the ground with the loader, it was running on 3 cylinders. I figured it was ignition related, and it's been a while since it's had a tune up, so I put new plugs, wires, and rotor on it. It's still not firing the 2nd cylinder from the back (3rd cylinder counting from the front)? I can pull the wire on/off that cylinders spark plug and the engine doesn't change it's tune at all. I pulled the plug wire off the plug in the head and put another spark plug in it, and it's sparking the plug perfectly. So I know I have fire in the cylinder, just no boom.

When I pull the plug after the engine has been running it's got unburnt oil on it.

Also on the manifold side, I see oil seeping from the bottom of the intake port?

I don't know how many hours this tractor has on it. I think the bottom end was rebuilt before i got it 15 years ago, but the head could of stood a rebuilt back then, and when i bought it I put a 3 point and loader on it and have used the heck out of it mowing, snow plowing, splitting wood, pulling posts, pulling wagons, trees when cutting wood, etc. But most the hours are mowing with a 6ft brush hog every year.

So I know it's past due to have some work done to the head. I just don't understand the oil seeping from the intake manifold port for that cylinder? That kinda concerns me? But maybe it doesn't matter if I need to rebuild the entire head anyway?

Has anyone seen this before? The exhaust/intake manifold is really old and brittle looking, so I thought that was why I dropped that cylinder, got a hole in it, but that doesn't explain the oil seepage or oil on the plug.

It smokes a very little while running under load, almost can't tell it if it is. When the governor kicks in it will send some smoke into the air while it digs down deep and revs up, but doesn't seem to use a tremendous amount of oil or anything. Odd it's leaking that much from the valve in the head (assuming that's where the oil is coming from)???

anyway, rambling... Please let me know your thoughts, and anything to look for, look out for, etc.

My wallet feels like it's going to hurt.

thanks,

mark


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