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Cub rod knock, oiling problem

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Steve Sawyer

01-22-2007 21:34:49




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I resently purchased my first cub, a 57. It sat for a long time, Got it running with a manifold with a hole in #4 exhaust runner. After getting it to run I replaced it with a good manifold. Now that it is quiet I noticed some faint rod knock. It may have run the engine a total of 3 minutes. OIl guage doesnt work. I pulled engine apart and out of tractor. #4 rod & #2 rod journal have slite grooving,but are tight. Everthing else in engine looks good, including cylinder walls. The insides of the crankcase and all the inturnals locked very dry, Something you wounldnt expect from an engine that had just been running a few hours before. I didnt measure it but there was quit a bit of crank end play. After reading on this site about cub oil pump priming problems, I started to wonder if all that was wrong with my engine is that it lost its oil prime. Did I tear it apart for nothing. Guess I shoulda read up on this sooner. I have found a lot of good info on this site And appreciate All the responses I have received to my past questions. Any input?

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El Toro

01-23-2007 04:08:38




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 Re: Cub rod knock, oiling problem in reply to Steve Sawyer, 01-22-2007 21:34:49  
I think that is quite common on the Cubs on losing their prime on the oil pump. I would buy a new oil pressure gauge and I would plasti-gage
all those bearings for clearance. Check those cylinders for wear too. There's an allen head plug at the left side of the block and you can squirt oil in here and remove the oil filter cap and fill the housing with oil and replace cap.

All the Farmall tractors have their oil pump bolted directly under the engine and is submerged in oil and as are most American cars and truck engines. The Cub pump is mounted at the rear of the block and that could be a design problem. I would pay close attention to the oil pressure gauge when starting the engine. I think this has happened when changing oil too. Hal

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