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Old 11-06-2021, 11:50   #1
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Westerbeke 30- diesel fuel in oil?

I have an old westerbeke 30 and discovered the oil is full of fuel. I was hoping for any help or where to start. I am going to start with the fuel lift pump.
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Old 11-06-2021, 15:12   #2
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Re: Westerbeke 30- diesel fuel in oil?

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Originally Posted by jmurray109 View Post
I have an old westerbeke 30 and discovered the oil is full of fuel. I was hoping for any help or where to start. I am going to start with the fuel lift pump.

Yes thats the best place to start. I don't know yr engine but lift pump diaphragm leak is a common cause of that problem.
It can be an injection pump leak too but far less likely.
Is engine running ok otherwise?
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Old 11-06-2021, 15:40   #3
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Re: Westerbeke 30- diesel fuel in oil?

Fuel lift pump
Possible push rod off a rocker arm. (I had this happen)
Possibly a leak in the injection pump.
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Old 11-06-2021, 16:44   #4
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Re: Westerbeke 30- diesel fuel in oil?

The engine is probably original to the Cal 34, built in early 70ís. Had the high pressure fuel injection pump rebuilt 2 years ago. Engine starts up almost immediately without glow plug even when cold. Engine sound and runs great. I donít think I have any compression issues, since the engine runs fine.

Somebody else mentioned the fuel injectors could be cause. I am not sure how this could be a cause, since the fuel is pushed into the cylinder. The fuel would have to travel back up into the head area.
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Old 11-06-2021, 17:19   #5
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Re: Westerbeke 30- diesel fuel in oil?

A third opinion, to check the lift pump.
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Old 11-06-2021, 17:53   #6
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Re: Westerbeke 30- diesel fuel in oil?

I have a W30, swapped mechanical for electric pump. Easy to do , makes bleeding easier.
And then I got a fuel injection pump leak. It is not the injectors but the high pressure pump. Gear driven off the oil pump shaft I think. Pretty easy to remove, 3 nuts 1/2Ē wrench. They can be hard to get at and you need a crow foot adapter for the bottom one.
I got mine rebuilt by advance Diesel Systems and he seemed very familiar with them. Less than $300.
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Old 11-06-2021, 17:57   #7
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Re: Westerbeke 30- diesel fuel in oil?

Diaphragms are not available from Westerbeke I don’t think, but one from an old MGA as it is the same engine block and likely pump. Might require a trip to a local British specialty garage to confirm. Moss Motors carries nearly every MGA part, many of which fit.


Edit- this is now coming back to me. MGA has an electric pump. Blocking plate available. Try Nash Metropolitan 1500 for fuel lift pump. The earlier 1200 model had a different block.
https://metpitstop.com/product-categ...tem/fuel-pump/
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Old 11-06-2021, 18:00   #8
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Re: Westerbeke 30- diesel fuel in oil?

Part #38 (or make your own) allows mechanical pump removal.

https://mossmotors.com/mga/engine-pe...ernal-engine-1
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Old 11-06-2021, 18:33   #9
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Re: Westerbeke 30- diesel fuel in oil?

And don’t run it until fixed. This can cause a runaway.
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Old 11-06-2021, 18:55   #10
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Re: Westerbeke 30- diesel fuel in oil?

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Originally Posted by sanibel sailor View Post
Diaphragms are not available from Westerbeke I donít think, but one from an old MGA as it is the same engine block and likely pump. Might require a trip to a local British specialty garage to confirm. Moss Motors carries nearly every MGA part, many of which fit.


Edit- this is now coming back to me. MGA has an electric pump. Blocking plate available. Try Nash Metropolitan 1500 for fuel lift pump. The earlier 1200 model had a different block.
https://metpitstop.com/product-categ...tem/fuel-pump/


Thank you this is very helpful. I had just ordered a new mechanical pump. I think I found the very last one. If for some reason it does not arrive, I will use your suggestion for an electrical one.
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Old 11-06-2021, 19:30   #11
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Re: Westerbeke 30- diesel fuel in oil?

Hopefully that is the fix. Easier to swap than the other. If you do have to pull the high pressure pump, mark the rotational position as it determines injection timing.

And I trust you will change your oil...

Where are you located?
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Old 11-06-2021, 19:49   #12
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Re: Westerbeke 30- diesel fuel in oil?

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Hopefully that is the fix. Easier to swap than the other. If you do have to pull the high pressure pump, mark the rotational position as it determines injection timing.



And I trust you will change your oil...



Where are you located?


Have already drained the oil, waiting for new pump to arrive. I had the high pressure pump rebuilt 2 years ago. It was a pain in the ass to get to, due to the location. Had to remove the sink.

I am in Dana Point and Voluteer for the Dana Point Sea Scouts (mariners936.com). I volunteer my time and limited skills to fix their boats, so the dues for the kids remain low.
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Old 11-06-2021, 19:51   #13
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Re: Westerbeke 30- diesel fuel in oil?

I had the same motor, same problem. Replaced the pump with a facet solid state. I used the lift pump gasket as a template to make a steel plate to cover the opening in the block......

A word of warning - there’s an oil cooler on that motor - a year after replacing the lift pump, the cooler developed a pinhole leak - I was leaving a sheen trail, and got seawater in the oil pan - took 3-4 oil changes to get it clean, and of course I was on a cruise at the time. Had to limp home - sea cock closed as soon as i shut down, and opened immediately before starting, stopping to replace lost oil hourly. I believe it was built into the oil filter housing if I’m not mistaken.

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Old 11-06-2021, 20:15   #14
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Re: Westerbeke 30- diesel fuel in oil?

Quote:
Originally Posted by sanibel sailor View Post
Diaphragms are not available from Westerbeke I donít think, but one from an old MGA as it is the same engine block and likely pump. Might require a trip to a local British specialty garage to confirm. Moss Motors carries nearly every MGA part, many of which fit.


Edit- this is now coming back to me. MGA has an electric pump. Blocking plate available. Try Nash Metropolitan 1500 for fuel lift pump. The earlier 1200 model had a different block.
https://metpitstop.com/product-categ...tem/fuel-pump/
I have had no trouble getting replacement lift pumps or rebuild kits. 1983 Westerbeke. The internet is a wonderful thing.
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Old 11-06-2021, 20:52   #15
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Re: Westerbeke 30- diesel fuel in oil?

I just recalled a source for w30 parts - w30parts.com

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