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Allis Chalmers Discussion Forum
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Advice on motor problem

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Wayne G

11-06-2006 12:44:45




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Just installed reworked head on 1946 WC, repaired holes in carb float. Previous owner said front crank seal leaked. Motor runs great, but the fornt seal pours, and crank moves back and forth about 1/8". Rear seal also leaking, but not as bad. My question to anyone is, how serious a problem do I have?




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Wayne G

11-06-2006 15:59:56




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 Re: Advice on motor problem in reply to Wayne G, 11-06-2006 12:44:45  
My neighbor brought over a dial caliper, and I should have said end play to start with, anyhow he checked the end play, and it is .060. How normal is this?



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old

11-06-2006 13:24:16




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 Re: Advice on motor problem in reply to Wayne G, 11-06-2006 12:44:45  
To fix the seals you need to pull the engine out. Also if all you did was a valve job you stand a good chance that the rings will soon go bad because you raised the compression by working on the head and now you have new/rebuilt valves and old rings. Engine wear at the same rate so its never good to just do the head or just the rings. You will probably need to do a rebuild of the engine to fix it the correct way

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Dick L

11-06-2006 13:23:47




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 Re: Advice on motor problem in reply to Wayne G, 11-06-2006 12:44:45  
When You say the crank moves back and forth an 1/8" are you meaning the crankshaft??? If so it is time for a rebuild. I wouldnt start plowing a 20 acre field that you wanted to finish. LOL Any more slop in the crank over .002 not the best. Any slop over .006 is bad. An 1/8" slop?? Never heard of that much. I would guess that it will take a crankshaft. That is if you were meaning crankshaft when you typed crank. Never can tell though unless you pull the thing apart and measure. If someone put in a crankshaft that was ground .040 under and put in standard bearings and didnt run it only a short short time you could still have a good crankshaft that needs proper bearings.

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Wayne G

11-06-2006 15:37:25




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 Re: Advice on motor problem in reply to Dick L, 11-06-2006 13:23:47  
Yeah, I meant the crankshaft, there is alot of end play, maybe 1/8" is exaggerated, but it is enough where when it is running, you can see it going in and out good, plus the oil leak, and also when the valve job was done the man asked about the type job the tractor would be doing, I told him the tractor was retired, so it would be taking it easy, so I don't think he fit everything tight. Thanks for the advice.

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