Perkins 4-108 with fuel in crankcase - SailNet Community

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Old 06-01-2007
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Perkins 4-108 with fuel in crankcase

Has anyone had this problem? I recently did an engine oil change and took out much more fluid than the was put in on the last oil change. After looking closely at the oil, it was less viscous than oil should be and it smelled like diesel fuel. I could not find how it got into the crankcase. So I put in new oil, did a short engine run and the oil pressure looked good, 45 psi. The following week I pulled the dip stick only to find that it had more fluid/oil in it than when I had changed it the week before and it smelled of diesel. The oil seems to be able to get in the crankcase even when the engine is not running. Is it the low pressure mechanical fuel pump, or the high pressure pump, or something else?
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Old 06-01-2007
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Perkins 4-108 fuel in crankcase

Had a similar problem on a friends 4-108. Check the cam shaft driven low pressure fuel pump. The diaphragm may have developed a leak. Youll have to pull the pump to find out.
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Thanks for the input. That is the direction I was leaning. It will be sometime next week before I can check it out and get a new one.
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Had the identical problem in my 28hp Volvo diesel and traced it to the fuel pump as well... replaced pump, no more leakage of fuel into oilpan.
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Old 06-02-2007
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It is more likely the high pressure fuel pump seals--get it fixed soon, as diesel is not as good a lubricant as engine oil.
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