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cub engine problem

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RP-40-9n

10-04-2006 17:09:27




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i bought a farmall cub, engine stuck, could not free it up so i opened it up and found, 3 pistons with stuck rings and 1 valve stuck open. i freed up the valve and ordered rings and rod bearrings, everything else was in good shape. now the problem the new bearrings work fine but the rings are so aggressive that you can barely turn it over, so i honed sanded and polished the cylinder walls to where they are like glass, it helped a little but not much. you can push one of these rings in a cylinder with your finger and you immediately feel the cutting and grabbing, these are standard size rings and bearrings and the rings are definately the problem. and yes i have .020 ring gap. could these rings be defective? im at wits end and this is one cub that might not live long enough to grow up. thanks for any help RP

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El Toro

10-04-2006 18:33:56




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 Re: cub engine problem in reply to RP-40-9n, 10-04-2006 17:09:27  
I think you should've used a glaze breaker with plenty of oil. When this is completed wipe out
all of the oil and any fine particles. Then wash each cylinder with warm soapy water using clean rags. Since the bore is so small you may need to push the rags through the cylinders. then dry them and coat them with engine oil.
Those rings may have a dot on them that should face up. It should be in the instructions. My manual has the ring gap on the compression rings at .007 to .017" and oil ring at .007 to.015". Hal

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old

10-04-2006 18:20:41




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 Re: cub engine problem in reply to RP-40-9n, 10-04-2006 17:09:27  
Did you clean the ring grooves with a groove cleanr tool?? Did you size the rings before you put them in?? The rings need to be put in the cylinders and have the correct gap in them before putting them on the piston. If you didn't do all or part of what I said you can/will have problem.



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Chuck's Repair

10-04-2006 17:47:41




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 Re: cub engine problem in reply to RP-40-9n, 10-04-2006 17:09:27  
Is there carbon buildup in the bottom of the piston grooves?Did you clean all of this carbon out?That would be the first thing I would check.



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Janicholson

10-04-2006 18:18:51




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 Re: cub engine problem in reply to Chuck's Repair, 10-04-2006 17:47:41  
I agree with Chuck, Rings will feel very stickie if placed by hand. THe ring grooves need to be cleaned with a ring groove cleaner, or scraped out with a piece of broken ring (very carefully to avoid scarring the ring lands) If the hatching is 45degrees, and done with 350-400 grit stones, and the grooves are clean, and the gap is spec, run it. New engines will be tight at startup. Change the oil at 10 hours, and use 15-40 oil. Prime the oil pump through the pipe plug near the filter with a squirt oilcan till it is not going to take any more. (this primes the oil system, they are notorious for loosing prime. I hope this helps. JimN

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