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Coolant Bypass Valve on '38 248 eng. - Question


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The coolant bypass valve for my '38 Series 40 engine is showing about a 0.1" gap around the seat area. The gap is very uniform and tells me that it isn't an artifact of corrosion but perhaps something like a rubber seal or something else missing? See the pics below - they show this gap, especially the pic of the inside view. Maybe this just acts likes an orifice during normal running; allowing an always present bypass of hot water back into pump suction? If so, I don't really like that thought but I guess it must have worked. Anyhow, does anyone know if what I've got is normal or should I modify it to close this gap?

Thanks for your help and input,




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