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Allis Chalmers Discussion Forum

125 Head Gasket

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Author  [Modern View]

07-29-2020 20:44:48

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I know the bore of a 125 is 3and 3/8" but I wonder if anyone has the exact diameter of the cylinder hole of the 125 head gasket itself. There seems to be some discrepancy as the dealer claims that the right gasket comes with a 3 and 5/8 hole. At this point we have no old gasket to make the comparison with. I appreciate your input, thanks.

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07-30-2020 08:03:42

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 Re: 125 Head Gasket in reply to Nordic, 07-29-2020 20:44:48  
Thanks so much for your time and input.

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Dick L

07-30-2020 04:59:30

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 Re: 125 Head Gasket in reply to Nordic, 07-29-2020 20:44:48  
I never actually measured the new gasket but that most likely would be correct. The fire ring would set on top of the sleeve and as it is crushed it would be forced in to cover the top lip on the sleeve. The fire ring must not be crushed to beyond the inside of the sleeve. I found this out in one of my head modifications where the fire ring was exposed and acted as an ignitor causing a diesel knock until the fire ring burned thru.

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07-30-2020 04:57:57

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 Re: 125 Head Gasket in reply to Nordic, 07-29-2020 20:44:48  
Just went and checked an old one and it measured 3 5/8"

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