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Old 15-05-2014, 08:40   #1
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diesel in oil

I checked the oil level and is higher rather than lower on dipstick. No sign of water in oil, so I suspect that it is fuel. It is not a lot higher level, but it is higher.
It is a perkins m-20/18 hp. I am currently in Marathon, and can make it on one engine to Ft.Lauderdale, but would rather not.
There is no smoke, and engine runs good, I am thinking it is an injector pump seal, but I am guessing!!!
Question is if Ineed that engine for an emergency, is it going to blow engine, and would it be better to send pump out for rebuild?
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Old 15-05-2014, 08:55   #2
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Re: diesel in oil

Does this engine have a lift pump? I would guess it is more likely to have a leaky diaphragm than the injection pump leaking into the engine.
I would change the oil if I were going to make a run for it.
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Old 15-05-2014, 09:06   #3
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Re: diesel in oil

It does have a lift pump
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Old 15-05-2014, 09:13   #4
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Re: diesel in oil

The fuel pump seal probable broke/leaked which would allow fuel to be pump direct into the oil pan. Good thing you caught it as that is how engine run away as the engine start to feed it self and many times blow the engine. However the good side is your engine is sparkling clean like new.
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Old 15-05-2014, 09:21   #5
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Re: diesel in oil

Two likely places where fuel can get into the oil are the lift pump diaphragm and the injection pump seals. See if you smell can diesel on the dipstick oil. The fuel in the oil will drop the oil pressure and can damage the bearings. If you want to go somewhere to get it fixed, I'd change the oil and reserve that engine for short term/emergency use.
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Old 15-05-2014, 09:40   #6
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Re: diesel in oil

Most likely source lift pump diaphragm.
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Old 15-05-2014, 11:39   #7
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Re: diesel in oil

Quote:
Originally Posted by Vasco View Post
Most likely source lift pump diaphragm.
Yanmar yes, Perkins no.
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Old 15-05-2014, 11:57   #8
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Re: diesel in oil

I've had this happen on Perkins and it was a fouled injector spraying a stream of diesel. This washed out the cylinder and went past the rings into the pan. It would make about 1-1.5 quarts in 8 hours.
If the level gets too high you could end up with a runaway engine. The same engine had a push rod that came off. long story. but that cylinder had low compression, but after correcting the injector the compression came up to normal after a couple hours running time. Engine ran fine the whole time.
As mentioned it could simply be the lift pump too.
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Old 15-05-2014, 12:32   #9
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Re: diesel in oil

Quote:
Originally Posted by donradcliffe View Post
Yanmar yes, Perkins no.
Why do you say that?
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Old 15-05-2014, 13:02   #10
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Re: diesel in oil

Definitely can be a bad injector.
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Old 15-05-2014, 15:12   #11
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Re: diesel in oil

Does the oil smell like diesel?

I say run it if you need to and check it often. If it definitely is making oil then don't run it, since you have two engines. Maybe crank it up just for docking if you NEED to, after an oil change, if it is a slow intrusion that doesn't raise the level noticeably in just a few minutes. But FIX IT IMMEDIATELY when possible. If you have a problem, it will probably get worse, and soon.
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Old 14-06-2014, 06:06   #12
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Re: diesel in oil

assuming the mechanical lift pump was the problem, I installed an electric pump and completely bypassed the lift pump. But now the problem seems to be worse, so injector pump or bad injector?
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Old 14-06-2014, 10:00   #13
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Re: diesel in oil

As engine runs well with no smoke (so its not an injector), and the lift pump isn't the problem (Yanmar lift pumps are more prone to failure than Perkins)--all signs point to a seal in the injector pump. Time to get the IP rebuilt.
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Old 14-06-2014, 10:23   #14
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Re: diesel in oil

The "slightly" over-full oil sounds more like dip-stick/operator malfunction. If you can't see, feel or smell diesel in the oil, you might be imagining it.
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Old 14-06-2014, 11:14   #15
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Re: diesel in oil

Is there any oil sheen on the water from the exhaust? I had little smoke at all with my really bad injector, but was getting a pretty good oil sheen on the water.
If no oil on the water, then... yeah... bad news...
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