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Old 25-05-2008, 16:59   #1
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Question Still have high oil pressure-ideas please?

Bula from Fiji,
Did some searching of past threads- couldn't remember if I'd posted this problem before or if it'd been covered- I have an old Isuzu Pisces 40 (three banger) that originally had no oil pressure gauge, only a burned out idiot light. We installed a sender and gauge, and it has always read high, like 60psi+, but lately reads off the numbers like 80+, 90 if the gauge read that high.
Obviously I'm concerned about blowing out seals if this is correct.
So what could be causing it? Stuck pressure relief valve, clogged oil lines? I have removed what I was pretty sure was the pressure relief valve (located near the filter, little spring-loaded pin-type deal) and it seems to move fine, not gummed up or anything.
Recently, from Tahiti on, I've been running a multi viscosity diesel grade oil (15-40) because I couldn't find a mono anywhere. Could that be the problem somehow?
Engine has about 2000 hours, oil changed every 100 hrs, no smoke, purrs like a kitten, but I'm concerned.
Thanks in advance for any help,

Mike
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Old 25-05-2008, 17:13   #2
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Could be the sender or gauge itself. Check those first. There are many posts on the forum on how to check the senders.

Check this thread

http://www.cruisersforum.com/forums/...sting-645.html
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Old 25-05-2008, 19:06   #3
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Thanks, we tested the sender and it seems to change resistance with changes in RPM, so maybe the gauge itself is bad. Will replace both and see what happens. Love it if it's a simple fix.

Mike
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Old 26-05-2008, 01:42   #4
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In regards to the Oil grade, the 15w40 is fine. The jap engines are designed for those types of grades. Being in a warmer climate, the 40 is a good number and you cold even get away with a 50. The lower number is for colder climates, so don't go for anything below the 15. Anything above 15 will also be fine.
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Old 26-05-2008, 01:59   #5
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Temporarily replace the sender with an accurate pressure gauge to verify the actual high reading first. If the pressure has increased that much you would see the results in other ways. Higher oil consumption, leaks, etc.
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Old 26-05-2008, 16:57   #6
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I have not worked on that particular engine but I am a diesel mechanic, usually high oil pressure happens when the oil pressure bypass valve gets stuck, this valve is usually a plunger and spring thats tensioned to bypass the oil from the mains if it gets too high, however they usually get stuck in an open position thus lowering the oil pressure. On some diesel engines these regulators have an external adjustment and its possible to mistake it for something else and somebody just cranks it tighter thus tightening the spring and creating high pressure, Hope this helps.
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