Oil pressure sensor

[Fred79]

Hi All

I have to replace the oil pressure sensor on my patrol. I got a new one from Nissan last week and want to replace it myself. The new one does not look the same as the old one that is currently on the car. I need to buy the right size sockets/spanners to replace the old one and fit the new one.

The new sensor can be fitted by using a 27mm deep socket which I do have but what do I need to remove the old sensor

Any one done this before? I don't fancy paying some one to replace this sensor.

Your help will be much appreciated

Old Sensor still in

New sensor

 

[The Patrolman]

Find a socket that fits :thumb2
Unscrew the old one, carefully as it looks a bit weak, throw it away:thumb2
Screw in the new one, not too tight, plug it backk in.:thumb2
Job done!:clap

 

[Adz]

Shed loads of WD40 & or Penetration fluid :thumbs

 

[firebobby]

Remember there are 2 oil switches on these, I changed the one on the drivers side when my oil light came on, no problems since.

 

[Barrbeast]

Hey bud, first off what year is your Trol as unless it's a very early 3.0 (and possibly even then) then as firebobby says you actually have two oil pressure sensors, a high pressure sensor and a low pressure sensor.

The one in your pic looks like the low pressure sensor (high up on the passenger side of the engine, behind the oil filter and underneath the turbo).

The high pressure switch is on the driver side of the engine low down just above the starter. It's not easy to get to on any Nissan but unfortunately a lot harder to get to on the Trols than it is on the Terranos. I've just managed to unplug my high pressure sensor before (and plug it back in) by removing the sump guard to get at it but it ain't easy. I should point that I have a bit more access under there anyway as I removed my plastic underbody covers a while ago (they're plastic so not guarding anything!) as they can collect grass and other debris up against the front prop shaft - fire hazard waiting to happen :doh and in Aus they stopped putting them on new workhorse spec Trols for that reason.

I'm guessing your oil pressure warning light is staying on which means it's highly unlikely to be the low, easy to get to, pressure switch. Far more likely to be your high pressure switch and if I were you I would fit an oil pressure gauge using a t-piece on the low pressure switch point (that's what I did) as it's a) easier and b) better than the on/off warning light anyway. That way you can see exactly what's going on with the oil pressure.

Anyway, if you want to replace or remove the low oil pressure switch this is what you do...

Don't worry about WD40 etc as it'll do stuff all since the switch will be loctited into the turbo banjo bolt. You'll need either a 26mm long socket or a 26mm ring spanner with the handle cut down to about 100mm. Drain and remove the oil filter and filter housing before you start as it'll give you more space to work with.

When you unscrew the oil sensor it's likely that the turbo banjo bolt will unscrew instead so be careful as there's a special metal gasket on the banjo bolt that will disappear into the bowels of the engine compartment if you don't catch it when you're unscrewing things. Just feel under and along the pressure switch and banjo bolt, towards the engine, and you should feel it there. If the banjo bolt comes out with the pressure switch just stick the banjo bolt in a vice and whack a spanner on the switch

Refitting is pretty easy, just refit the banjo bolt (and gasket) if it came out and tighten to the correct torque. Whack some high temp pipe thread or liquid thread sealant etc on the pressure switch thread, screw back into the banjo bolt and torque it up, then refit the oil filter.

If you're fitting a t-piece just fit it into the banjo bolt first :thumbs

 

[Fred79]

Hey bud, first off what year is your Trol as unless it's a very early 3.0 (and possibly even then) then as firebobby says you actually have two oil pressure sensors, a high pressure sensor and a low pressure sensor.

The one in your pic looks like the low pressure sensor (high up on the passenger side of the engine, behind the oil filter and underneath the turbo).

The high pressure switch is on the driver side of the engine low down just above the starter. It's not easy to get to on any Nissan but unfortunately a lot harder to get to on the Trols than it is on the Terranos. I've just managed to unplug my high pressure sensor before (and plug it back in) by removing the sump guard to get at it but it ain't easy. I should point that I have a bit more access under there anyway as I removed my plastic underbody covers a while ago (they're plastic so not guarding anything!) as they can collect grass and other debris up against the front prop shaft - fire hazard waiting to happen :doh and in Aus they stopped putting them on new workhorse spec Trols for that reason.

I'm guessing your oil pressure warning light is staying on which means it's highly unlikely to be the low, easy to get to, pressure switch. Far more likely to be your high pressure switch and if I were you I would fit an oil pressure gauge using a t-piece on the low pressure switch point (that's what I did) as it's a) easier and b) better than the on/off warning light anyway. That way you can see exactly what's going on with the oil pressure.

Anyway, if you want to replace or remove the low oil pressure switch this is what you do...

Don't worry about WD40 etc as it'll do stuff all since the switch will be loctited into the turbo banjo bolt. You'll need either a 26mm long socket or a 26mm ring spanner with the handle cut down to about 100mm. Drain and remove the oil filter and filter housing before you start as it'll give you more space to work with.

When you unscrew the oil sensor it's likely that the turbo banjo bolt will unscrew instead so be careful as there's a special metal gasket on the banjo bolt that will disappear into the bowels of the engine compartment if you don't catch it when you're unscrewing things. Just feel under and along the pressure switch and banjo bolt, towards the engine, and you should feel it there. If the banjo bolt comes out with the pressure switch just stick the banjo bolt in a vice and whack a spanner on the switch

Refitting is pretty easy, just refit the banjo bolt (and gasket) if it came out and tighten to the correct torque. Whack some high temp pipe thread or liquid thread sealant etc on the pressure switch thread, screw back into the banjo bolt and torque it up, then refit the oil filter.

If you're fitting a t-piece just fit it into the banjo bolt first :thumbs

wow! Thanks for all the info. Yes the oil light started to come on and went off again but has been staying on permanently lately.

My Patrol is a 54 plate with the face lift.

 

[Barrbeast]

No bother bud. You're Trol will just be a few months younger than mine then ('54 pre facelift).

More than likely gonna be your high oil pressure sensor causing the issue then I'm afraid. Common recurring problem, sensor can't cope with the pressure fluctuations, Nissan tried tried to cure it by fitting a resistor and an adaptor on the sensor but I understand that while it does help it doesn't cure it permanently.

Choices are get it replaced/try to replace it yourself and then do the same when it happens again or like I said fit an oil pressure gauge to allow you to keep a proper eye on the pressure and ignore the warning light.

I fitted a gauge myself and tbh am much happier as I think it's better than an off/on warning light anyway - for example when my first t-piece started to crack (my own fault when fitting) I knew something was up before I spotted the oil leak as the pressure had dropped a bit at idle.

 

[Fred79]

Thanks, I will order a new high pressure switch for now and get both fitted by some one. At the moment chaos at work and in middle of a house move. If it gives me problems again in the future then I will go down the route of changing it with a gage.

Thanks for the info :thumb2