125 Head Gasket

Nordic · Jul 29, 2020

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.

VACLee · Jul 30, 2020

Just went and checked an old one and it measured 3 5/8"

Dick L · Jul 30, 2020

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.

Nordic · Jul 30, 2020

Thanks so much for your time and input.

125 Head Gasket

Nordic

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VACLee

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Dick L

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Nordic

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