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Old 29-05-2008, 10:37   #1
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Rising Oil level 3QM30

Hi,
I posted in December asking about a rebuild on a yanmar fuel injection pump. The pump was rebuilt and re-installed and everything seemed fine. However now I notice a rising oil level and the oil has a fuel smell to it. I'm getting about .5-.75 QT more oil in 60 hrs of engine time.

I've removed the lift pump and inspected the diaphragm. There are some small cracks in the surface of the diaphragm, but no obvious failure. I replaced it just in case that's where the fuel is getting into the oil.

My question is: Is it possible for fuel to get into the lube oil through the injection pump?

The motor runs fine, though after re-installing the rebuilt fuel injection pump it has been a little hard to start. It used to fire up after 1-2 seconds of cranking, now it takes 3-4 and may 'ka-chunk-ka-chunk-ka-chunk' a bit before starting. I think I may have the timing a degree or two retarded and am attributing this hard starting to the timing.

Any ideas/comments would be appreciated...

John
S/V NAKIA
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Old 29-05-2008, 14:24   #2
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Why would the timing have been altered?? Have you had the IP out??
Usually no, the fuel can not get pat the IP seals and into the sump.
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Old 29-05-2008, 16:29   #3
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Yep, the IP was removed to have it re-built. New Plungers/barrels, new delivery valves and seats, new gaskets.

When I removed the pump, one of the shims got destroyed so I had to replace the shims. This required checking the timing. Not that hard really, just a lot of slowly turning the motor...

John
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Old 29-05-2008, 16:36   #4
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svnakia:

No info on the engine but I was impressed with the brief look I took at your blog. I'll read more after work.
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