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Old 17-03-2009, 11:22   #1
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Perkins 4-236 low oil pressure

The engine stalled out at sea and was later to find that oil was full of water. oil changed and oil heat exchanger changed and now ok except that when warm engine only has 25 psi oil pressure. This is my brothers boat in Mexico and trying to help with problem. My thought was maybe he damaged oil pump but I am not a diesel mechanic. Any advice I could pass on to him would be appreciated.
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Old 17-03-2009, 18:35   #2
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Any advise would be mearly a guess but the loss of oil pressure can be oil pressure sending unit. not likely.oil pump check valve not likely. oil filter, should have been changed when oil and water mixture was drained,not likely. oil pump likely but not #1
since you stated the engine stalled at sea I would check the bearings. If rebuild is not possable at this time a heavier weight oil could bring the pressure up 5 or 10 pounds but this is not a cure. an overhaul in Mexico could be less expensive than in the states
good luck
Roscoe
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Old 17-03-2009, 18:58   #3
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Perkins Says ...

Alibaba.e,
Not sure what kind of library you have down there, but here is the excerpt from my 4.236 workshop manual.

Section D - Fault Finding
Fault: Low Oil Pressure
Possible Causes: 4,36,37,38,39,40,42,43,44,53,58
4 - Incorrect grade of lubricating oil
36 - Worn or damaged bearings
37 - Insufficient oil in sump
38 - Inaccurate gauge
39 - Oil pump worn
40 - Pressure relief valve sticking open
42 - Broken relief valve spring
43 - Faulty suction pipe
44 - Choked oil filter
53 - Choked gear box or engine oil cooler
58 - Blocked sump strainer

You can eliminate many of these based on the original symptoms. But then again, if someone cracked into the oil system to do major maintenance, then you may want to physically eliminate these one by one to be sure unrelated faults haven't been introduced.

Good Luck ... Amigo!
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Old 17-03-2009, 19:05   #4
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Multiple oil changes are necessary until no trace of water remains. Suggest adding one pint of Marvel mystery oil to each change. Run the engine for a couple of hours and get the diesel up to operating temperature. ...then change the oil. Probably will take at least 5 changes.
This assumes he is not seeing black smoke or other evidence of oil present in the exhaust.
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Old 17-03-2009, 19:44   #5
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Marvel Mystery

Cam! You like that stuff, too? A friend of mine just introduced me to it. I thought I would put some in my Perkins. To hear the other guys talk about it, it could cure the common cold.
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Old 17-03-2009, 21:24   #6
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oil full of water...busted head gasket. DO NOT RUN until it is changed out, and the oil is flushed several times. if you are lucky you can save the engine.

don't ask me how i know about a busted head gasket in a perkins diesel...
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Old 19-03-2009, 02:39   #7
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I am based in gran canaria and am looking for a perkins 4236 low line marine engine oil cooler.
Any ideas, anyone
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Old 27-03-2009, 18:55   #8
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Oil Cooler

Is it discontinued?
You can't get a suitable replacement?
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