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Allis Chalmers Discussion Forum

Compression on B question

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01-25-2008 08:12:46

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I did a hot compression reading and found that 3 and 4 are 120 and 1 and 2 are 115.
So, what causes this as the book says 95?

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01-25-2008 15:45:50

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 Re: Compression on B question in reply to Plowjock5, 01-25-2008 08:12:46  
Could be carbon build up. There is a procedure to spray a water mist into the throat of the carb while running at a fast idle to loosen it up and blow it out. I've used it successfully on my Ferguson for the same problem. Then disassemble your air cleaner and clean thoroughly with kerosene. When clean and dry, add the same oil you use in the engine to the cup to the right level and then keep it maintained according to the manual. Mine had sucked winter oil up through the carb when it was not changed out to heavier summer oil.

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01-25-2008 13:19:25

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 Re: Compression on B question in reply to loveshisallis, 01-25-2008 08:12:46  
Appreciate the good comments fellas.
My thing is that when I use it to cut five acres once a week, in about three cuttings the oil is BLACK and smells BURNT. I have tried cleaning out the crankcase, etc,and still the same thing. I get some blue smoke out of her on load. Starts good enough though, and thinking of replacing the distributor with a hot mag that i have.

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01-25-2008 14:26:36

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 Re: Compression on B question in reply to loveshisallis, 01-25-2008 13:19:25  
Try this and it may help. The next time its say a half qt. low on oil top it off with transmission fluid, no more the a pint. Also next time you gas it up use 1QT ATF t 5 gal. of gas. Doing that will help clean up carbon and old sludge. Oh by the way its common for oil to turn black after just an hour or so in an old engine, just part of have it is

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01-25-2008 12:52:32

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 Re: Compression on B question in reply to loveshisallis, 01-25-2008 08:12:46  
Those numbers are nothing to complain about but brag about. Over the years the head could have been shaved some, or different pistons installed etc.

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gary tomaszewski

01-25-2008 09:42:34

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 Re: Compression on B question in reply to loveshisallis, 01-25-2008 08:12:46  
50 + years old, MIGHT have been overhauled once or twice,(bigger sleeves and pistons, maybe the head surfaced), newer thinner head gasket. Could even be carbon build up on pistons. Books have always only been a suggestion of how things are in a perfect world.

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