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Diesel This is a new forum dedicated to diesel engines and their applicable accessories.


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Old 09-09-2013
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Assistance neeed for Volvo high oil pressure (jump) above 1300 rpm

Hello.

Today, our Volvo Diesel TAMD41H-B(BT) engine had oil pressure problems. Everything is fine until the RPMs get above around 1300. At that point, the oil pressure gauge shoots up to 120 PSI or higher. This is not normal. Normally, we run at 55-60 psi at 1700-1800 RPM. We caught this problem fairly quickly as we monitor the engine closely.

However, there is very little guidance on troubleshooting the problem in any of our manuals. Does anyone have any ideas?

Thank you,
Paul Fowler
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Old 09-09-2013
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Re: Assistance neeed for Volvo high oil pressure (jump) above 1300 rpm

First check it with a mechanical gauge. The electric gauges can short out. If it turns out to really exceed normal pressures then you have a problem with the relief valve. (Usually mounted in the oil pump)

Mechanical gauges are available in most auto parts stores fairly inexpensively.

I have seen a stuck relief valve blow the oil filter off. Not good.
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Re: Assistance neeed for Volvo high oil pressure (jump) above 1300 rpm

It looks like I have some study to do. The Volvo operator's manuals don't show the locations of the oil relief valve, etc... Luckily, I am anchored close to an auto parts store, so I can go there.

Could a semi-clogged oil filter, cause this issue? Or would that simply cause lower oil PSI? Also, my wife notices some "squeaking" from the front of the engine about the time that the PSI jumps up. I was thinking it was a normal belt squeak, but could that be related?
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Re: Assistance neeed for Volvo high oil pressure (jump) above 1300 rpm

From what I can remember of oil pressure relief valves they're designed for the viscosity of the oil which changes with oil temperature as well as the output of the oil pump.

Is there any difference in oil pressure when the oil is cold vs warm and if so at what rpm's?

I'm having problems with my electrical fuel level gauge so I like the comment of checking the oil pressure gauge for a short. My problem is with the sending unit.

Last edited by kentobin; 09-09-2013 at 06:54 PM.
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Re: Assistance neeed for Volvo high oil pressure (jump) above 1300 rpm

We noticed the oil pressure problem fairly quickly, and it remained a problem after the engine warmed up, so I don't think the temperature of the oil is impacting our problem. I am still curious if anyone has seen high PSI with filters that need replacing.

I should give a little more background. Three weeks ago, the engine flooded.

We replaced all of the oil and filters about 5 times until the oil was very clean and the engine ran smoothly. The oil currently looks very clean and is at the correct level. The engine has been running smooth since the incident. I wonder, however, if the oil filter might have taken out more contaminant and simply replacing the oil filter will fix the issue?

However, if high oil PSI is never associated with an oil filter, then there is no need to replace another filter. Perhaps something got into the relief valve, but why happen now after running the engine for 30 hours since the incident?

Should I go get the manual pressure gauge first, or should I change the oil filter first?
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Re: Assistance neeed for Volvo high oil pressure (jump) above 1300 rpm

I don't know what brand of oil pressure gauge you have but vdo has had a number of people complain about their sending units on boat forums. I came across that info several years ago when I was researching which gauges to buy.

That's the extent of my knowledge base.

I did come across this site today: http://boatdiesel.com/index.cfm?FM=1

It allegedly has manuals for your engine in its library but you need a $25 subscription. It also has engine forums/blogs. Not sure how much if anything is free. Depending on how desperate you get you might want to give them a try.

One review for boatdiesel.com site: boatdiesel.com - worth subscribing?
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Re: Assistance neeed for Volvo high oil pressure (jump) above 1300 rpm

The oil pressure relief valve has to be situated before the filter. There is also one in the filter housing. In that case it is called an "oil filter bypass valve".

The squeaking noticed could be the result of a short putting a high load on the alternator.

First it's good to determine what is broken. Hence the mechanical gauge. Guessing is seldom fruitful.

The auto parts store may have a picture of the oil pump and perhaps also a picture of the sending unit. It's usually helpful to know what you are looking for. That is where you will put the mechanical gauge.
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