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rskaug 12-30-2007 06:48 PM

Kubota oil pressure
I'm considering purchase of a catamaran with newer Kubota engines. Both are under 500 hours. On a survey done back in April the surveyor noted that oil pressure on the port engine was 40psi at 2100 rpm and 60 at 2000 on the starboard. Both within manufacturer's specs. Is this a big red flag? I will get a new survey if I decide to go ahead, question is should I hire a mechanic for an engine check?


bogdog 12-30-2007 07:02 PM

40 psi or 60 are not considered low. Was there a temp. difference at the time of the test? Could the lower psi engine been run more recently relative the other before the test? Engine temperature makes a big difference in oil psi the colder an engine the higher the pressure. Also why didn't they test both at the same RPM (one at 2000 and the other at2100)? I would talk to the surveyor and get their take on the difference.

rskaug 12-30-2007 07:23 PM

Bogdog, All good questions that I don't know the answer to. I guess if/when I get my own survey I'll pay attention to those items and call in a diesel mechanic if we get the same results. Thanks very much. Dick

Rockter 12-31-2007 06:04 AM

Oo cold start-up, my olde Volvo MD17c will have an oil pressure of about 55 psi at approx 1800 rpm.
At steady-state operating temperature, and it takes some time to reach it, the oil pressure will be about 32 psi.
As the oil ages, that will drop very slowly.
Bodog is right, oil temperature has a huge effect on oil pressure.
Try both motors stone cold, and worked at the same rate thereafter. Al eyes on those guages.

JimsCAL 12-31-2007 10:18 AM

There is a chance the port engine was run a bit longer before the measurement and thus the oil was warmer. As long as the pressures are within spec, I wouldn't worry.

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