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Low Oil Pressure While Driving Rb25det

R33 0wnerrr

By R33 0wnerrr,
in Engines & Forced Induction

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R33 0wnerrr Enthusiast

R33 0wnerrr

Posted
Posted

Hey guys,

My rb25det today while i was driving along was reading fine oil pressure on the factory gauge...about 5 on the cold start...then about 3.5-4 when i was cruising at 100 on the motorway at about 2800rpm...

But on the trip home it was only reading just a tiny bit over 2 on the gauge....no matter how fast i went...and it idles at just under 2...

It seems to be doing this randomly on and off lately...

So my question really is wondering if the oil pump is on its way out? its running a standard rb25det oil pump...its done nearly 140,000ks

I am doing the car serious damage to the bottom end or any other parts starving it of oil driving it like this arent i? is there any method of checking that its the oil pump or to check what it is causing this?

Thanks guys...any help would be appreciated..and yes i did search

bubba Grand Master

bubba

Posted
Posted

Does the light come on? if that comes on you really have to worry.. otherwise, the gauges/sender are notorious for being dodgy.

Get a quality electric oil pressure gauge and then you will know exactly what's going on.

R33 0wnerrr Enthusiast

R33 0wnerrr

Posted
  • Author
Posted
Does the light come on? if that comes on you really have to worry.. otherwise, the gauges/sender are notorious for being dodgy.

Get a quality electric oil pressure gauge and then you will know exactly what's going on.

Na it doesnt come on...going to try get a gauge tomorow...might aswell use this as an excuase to get a oil filter relocation kit while im at it :)

tridentt150v Grand Master

tridentt150v

Posted
Posted

Mine has done this as well, but I didn't care because I had an AM gauge that told me OP was OK. And strangely enough, the factory oil pressure gauge eventually came good and han't done it again [probably killed it by saying this out loud now...damn].

Granthem Mentor

Granthem

Posted
Posted
Does the light come on? if that comes on you really have to worry.. otherwise, the gauges/sender are notorious for being dodgy.

Get a quality electric oil pressure gauge and then you will know exactly what's going on.

That said, by the time the light is on, the damage is done. It needs nearly no pressure for the light to come on.

You have done the right thing OP, keep an eye on it. But i reckon a mechanical gauge will show its just a faulty sender

Granthem Mentor

Granthem

Posted
Posted
Please don't suggest he use a mechanical oil pressure gauge.

Even a cheap electric gauge is far superior than running a capillary full of oil into your cabin.

Whatever floats his boat I guess. Mech/Elec. Still involves dicking around with lines and or wires.

Maybe he likes oil sprayed on his interior :cool:

tridentt150v Grand Master

tridentt150v

Posted
Posted

Actually ther ones that you used to be able to get that were oil filled behind the viewing glass = so the gauge range and needle is swimming in oil - always looked very trick. But yeah electronic these days is the go, no charisma, but no oil over the carpet either.

bubba Grand Master

bubba

Posted
Posted
Actually ther ones that you used to be able to get that were oil filled behind the viewing glass = so the gauge range and needle is swimming in oil - always looked very trick. But yeah electronic these days is the go, no charisma, but no oil over the carpet either.

They weren't exactly oil filled, but some sort of silicon fluid, the point was to dampen any needle fluctuations so as to give a more accurate reading.

R33 0wnerrr Enthusiast

R33 0wnerrr

Posted
  • Author
Posted

If yours hovers around 2-4 while driving warm..im sure thats normaly what it should be,

Mine wasnt going over 2 while cruising on the motorway or watever revs i gave it, but this chops and changes everytime so ill post a reply when i get my oil pressure gauge..as soon as money permits!

Btw i would be interested to know if the oil light does come on if a pump is stuffed or stuffing up...not if your engine has no oil haha

Wheezy Mentor

Wheezy

Posted
Posted
Does the light come on? if that comes on you really have to worry.. otherwise, the gauges/sender are notorious for being dodgy.

Get a quality electric oil pressure gauge and then you will know exactly what's going on.

QFT!

Granthem Mentor

Granthem

Posted
Posted
Btw i would be interested to know if the oil light does come on if a pump is stuffed or stuffing up...not if your engine has no oil haha

The light comes on when there is no oil pressure (or very very low) so it will come on when you have no oil OR if your pump shits itself :laugh:

The standard nissan oil pressure recommendations can be found on this site, just do a search. Either way, the standard acceptable figures are lower then what 99% of skyline guages show

  • 4 weeks later...
cr4ig0 Contributor

cr4ig0

Posted
Posted

I'm having a similar problem, my car has 150,000 and each day the car is running less pressure (went from 3.5 to 2 to 1.5 and this morning i noticed it on 1) I'm pretty concerned about something damaging like oil pump especially since the high km's.

I read above that its probably the gauge but will the gauge still read okay only lower? When i boost it moves up to 4 on the gauge but on idle or cruise it will drop again.

paulr33 Grand Master

paulr33

Posted
Posted

on light cruise / driving at 100km/h i would expect 2 kgcm2 oil pressure

my 220,000 rb25 with old oil in it has this pressure and its reasonble

when cold it will peak past 4kgcm2 and slowly decay to 2 when warm

1 kgcm2 at idle is too low

if oil pressure is critically low, oil pressure idiot light comes on

if this comes on during heavy load id say your engine is toast

if it comes on at idle, check the guage, and try an external tester/reader/mechanic

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