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kenmill1958

Allis 917 / Kohler M-18 Fuel in Crankcase

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kenmill1958
My recently re-engined 917 with a Kohler M-18 is filling the crankcase with fuel. I know in most cases the float can cause this condition. I am not too familiar with these engines and fuel pumps. I thought the fuel pump might cause this also. Any help much appreciated. Thanks Ken

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Simpleton7016
I think it has to do with the positioning of the fuel tank (and gravity) and you MUST put a fuel shut-off on before the carb....and never forget to use it. I have forgot twice and discovered my mistake when I needed my snowthrower most! Ended up doing oil changes while a blizzard roared outside. Fortunately, both times I had oil in stock.

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427435
Hmmmm. I've never had that problem with my 917, 7117, or Scag. I would try replacing/rebuilding the fuel pump-----it should block the gravity feed of the fuel tank if everything is clean and working in it.

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HubbardRA
If the bottom of the gas tank is above the top of the carb, then you don't even need a fuel pump. One common reason for fuel in the crankcase is a leaking diaphram in the fuel pump. I eliminated the fuel pump on one Kohler engine I have and it ran even better than with it, because the carb was below the gas tank. Another problem is a leaking needle valve, which can be counterracted by putting a shut-off valve between the tank and the carb. I thought the M18 had the electric shut-off valve in the carb, or am I mistaken. If it does, make sure it is working when the engine is shut down.

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