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Allis Chalmers Discussion Forum


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ac bear

07-11-2009 16:38:51

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I have a allis chalmers wc that has so much compression that i can not crank it, so it has to be pulled to start it and then it is hard to turn over. Someone has rebuilt it with M&W pistons. I'm 70 and looking for a simple way to lessen the compression. Can a person go to a different head or put more than one head gasket on it and will this help? I really like the tractor, but do not want to do a complete rebuild at this age. Thank you.

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07-12-2009 14:17:17

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 Re: compression in reply to ac bear, 07-11-2009 16:38:51  
M@ w pistons up the compression from factoru 5.4 to 5.7 not enough to make it hard to start. I would say it was put together incorrectly and is to tight. as they posted if you take the plugs out and cant turn it easy by hand the mains or rods are to tight . Its a common mistake.

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07-11-2009 19:04:28

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 Re: compression in reply to ac bear, 07-11-2009 16:38:51  
Have you taken all the plugs out to see how easy or hard it turns over?? If it turns over hard with the plugs out it is time to drop the pans and check the bearing clearance.

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Jerry Coulter

07-11-2009 17:34:42

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 Re: compression in reply to ac bear, 07-11-2009 16:38:51  
Are you sure it is compression? How much has it run since overhaul? I'm thinking that the crankshaft bearings are adjusted too tight and may burn out. Hopefully the mechanic didn't install a WD45 crank with flat top pistons, then it would have excessive compression.

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