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1948 Farmall Cub - Exhaust manifold overheating/sm
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Posted by Dave from York Haven PA on August 11, 2006 at 07:00:27 from (12.108.117.125):
I've been having power drop off problems on my 1948 Farmall Cub. Spark Plugs have been replaced, and I just now replaced the distributor cap and spark plug wires, because they were pretty badly corroded. I have a condensor replacement, but haven't installed that yet-kind of intimidated by that repair right now. Anyway, after I installed the wiring, which went without problems, I replace all (5) one at a time (4 plugs + main). I know from the doc that the firing order is 1-3-4-2, and I'm assuming the cylinders are numbered sequentially 1 to 4 from front to back(can someone verify 1-to-4 front to back please. If I trace the wiring from the distributor cap starting at the top (1) position, the spark plug wires run 1-3-4-2. Now my concern:
When I crank start the tractor (battery needs replaced), it fires up and runs fairly smooth. After about 5 minutes, I notice 'fumes' or 'smoke' or thin, veiled vapors coming up from the engine's exhaust manifold up the outside length of the exhaust pipe (I have a vertical exhaust). Is this gasoline vapors that haven't been ignited and will they eventually ignite while running the tractor? I haven't seen any doc on this condition and how to correct it. It never did that before. I just think maybe something is not right with the firing order. I had removed the rotor once when I found the old distributor cap was corroded, but I thought I put it back in place the way I had found it, but I guess it's possible the teeth on the underside of the gears my not be exactly right. When I had removed it the one time, I had the tractor in gear so that nothing would move, because I was scared. I was trying to figure out how to replace the condensor. Is this thin wispy vapor problem the result of a timing problem? Please advise when you can...this is beyond me.
I am not a mechanic, but I need to cut grass-now hay-soon, and I need my baby back in good health.
Thanks ahead of time,
Dave Rhan
(717) 541-7176
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