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R32 Gts-t Oil Pressure

adamp_r32
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adamp_r32 Explorer

adamp_r32

Posted
Posted

OK guys,

Oil pressure on my skyline is at a tad under 4 when driving (never goes over 4) and abit under 2 when idleing and that to me seems low, im positive it used to be higher. So my oil pump is obviously on the way out and ive been told its an engine out job? Any information would be good.

Cheers, Adam.

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**RB2530** Proficient

**RB2530**

Posted
Posted

Dude,

I think the most common cause of low oil pressure is worn main bearings in the engine...The bigger the bearing clearance, the easier the oil can flow through them and therefore lowers the back pressure on the pump.. It is rare that low oil pressure it is due to a dodgy oil pump...Pumps do fail but I think they often fail completely...more commonly low oil pressure is caused by something else...

BUT your oil pressures are fine by the sound of it...Also remember that oil pressure will change with different oil viscosities..If you change oil weight your oil pressures will definately change...

One more thing...it is well known that the Nissan oil pressure sensors can get a bit dodgy...I had one in a 98 model GTSt fail...I was worried about low oil pressure...I put an aftermarket mechanical gauge and found the oil pressure was above specification...

**RB2530** Proficient

**RB2530**

Posted
Posted
The senders seldom fail. What normally happens is the screws holding the backing on the pump loosen up and let oil bypass the pump. Best to check with a mechanical gauge also, I have both fitted.

There is actually several accounts of failed oil pressure sensors on these Forums...Mainly they lose their calibration over time..I class this as a failure...The sensor is failing to give an accurate enough indication of oil pressure...That is a failure...Trouble is this failure is a "hidden failure" and sometimes never detected...Reliability Engineering 101 here...

The factory gauges are also highly damped so they are slow to react to transients in pressure...

But I do agree with you regarding second gauge..For any highly critical parameter such as oil pressure, two independant sensors is best. Nissan kind of do this by having a oil warning light, plus an oil pressure gauge...Only trouble is both indicators use the same sender...

Shaun Mentor

Shaun

Posted
Posted

^^^^^Yeah the senders are shite. My standard one commonly reads zero while my greddy gauge says 4 o r 6 or something like that. Its well known the senders fail.

Why is this thread in the drivetrain section?

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