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Discussion Starter #1 (Edited)
My R32 seems to suddenly have very low oil pressure. The needle is actually on 0 at startup but the warning light is not on. If i blip the throttle it doesn't really move .... then suddenly it jumps up to 2 where it will then happily sit a idle and where it stays regardless of what revs the car is doing. :confused: Now if I’m to believe what the gauge is telling me I’m fairly sure i should be very worried. :eek:

There are two things that make me think that the gauge may be telling porkies:

1: Having just fitted Apexi power intake induction kit I’m wondering if i have got a dodgy connection to the sensor which i have disturbed somehow???

2: The other possibility is that another problem i have at the moment with a dodgy alternator which is causing me to have really dim lights when i first start the car, is somehow effecting the power supply to the gauge. Is that a possibility or is that just wishful thinking on my part?

How reliable are the standard oil pressure gauges in an R32?

Any ideas on things I can eliminate before panicking more than i am now and resigning myself to a possibly large bill??
 

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BLZBUBB - probably a faulty Oil Pressure Sender Unit and / or a faulty gauge.

I had my sender unit changed while my car was in having the turbo's done. I think my gauge is also faulty (going off what it displays anyway).

If you are worried about it, take it to a specialist and ask them to check it out.
 

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Discussion Starter #4
Cheers guys.
I did do a search but this is one of those things where I see a possibly large bill heading my way so thought it was best to ask :D

I'm just about to order some Defi gauges including a Oil pressure gauge... do these come with a sender?
 

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Mine had exactly the same symptoms and the sender was broken... along with the oil pump, resulting in a full bottom end rebuild. Be very gentle (or preferably don't drive it at all) untill you know what pressure it's making. Good luck, fingers crossed it's just the sender.
 

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Discussion Starter #6
Ok thats a little worrying!

I have just started it up and have been trying to diagnose the problem.

When it first started the pressure went straight up to just below 6. I let the car run and as the water temperature reached its normal place the pressure was around 4. I left it running to see what effect the oil temperature would have. As the oil temp got to 75-80ish (which is about as high as it will go without driving it) the pressure read around 2 until I blipped the throttle and it dropped to just between 0 and 2! I turned the car off and let it sit for a minute then turned it on again. This time the reading was 0! until i blipped the throttle again and the alternator kicked in and it went up slightly to about 1/4 of the way between 0 and 2.

Now assuming for the moment that the gauge is ok, to me this would point to a knackered pump
:(
 

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A mate of mines GTR 33 had this problem a few months back ,changed the pump as it was bugg*rd and then changed the bottom end shells as a precaution .The shells were just showing a slight sign of wear and cost about 90 quid ,he did it himself as he is a Mechanic ,all has been fine since :)
 

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BLZBUBB said:
Ok thats a little worrying!

I have just started it up and have been trying to diagnose the problem.

When it first started the pressure went straight up to just below 6. I let the car run and as the water temperature reached its normal place the pressure was around 4. I left it running to see what effect the oil temperature would have. As the oil temp got to 75-80ish (which is about as high as it will go without driving it) the pressure read around 2 until I blipped the throttle and it dropped to just between 0 and 2! I turned the car off and let it sit for a minute then turned it on again. This time the reading was 0! until i blipped the throttle again and the alternator kicked in and it went up slightly to about 1/4 of the way between 0 and 2.

Now assuming for the moment that the gauge is ok, to me this would point to a knackered pump
:(
I'm not entirely sure - if it does read 6 bar from cold at some point then then pump can't be completely shot... mine only ever went to 2 bar max after I had the sender changed.

Stealth - my shells were completely and utterly worn... i.e. down to the copper :eek:
 

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That sounds like a knackered sender / wiring / gauge to me :)

Get a garage to remove the oil pressure switch and replace it with a proper mechanical oil pressure gauge. Then you really will know what's what.

Its no more than about 15 minutes work, so shouldnt cost you a packet. :D
 

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Pikey said:
That sounds like a knackered sender / wiring / gauge to me :)

Get a garage to remove the oil pressure switch and replace it with a proper mechanical oil pressure gauge. Then you really will know what's what.

Its no more than about 15 minutes work, so shouldnt cost you a packet. :D
Good advice.

How's your car going?
 

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Discussion Starter #11
Cheers guys. I'm going to try and get a mechanical gauge on it and see what’s going on. Is the another more accessible point where i can get a reading from? If I’m reading the engine manual correctly the pressure switch is right down by the filter which will be a pain to get to. Again thanks for the help.
 

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It really isnt that bad, nowhere near as bad as getting to the filter. Its a big gold cylinder thing. 17mm thread IIRC :)

vennuth - car isnt going anywhere for the moment, just up on ramps while we sort this damn gearbox mount out. It should be ready to roll sometime next week :smokin:
 

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Pikey said:
It really isnt that bad, nowhere near as bad as getting to the filter. Its a big gold cylinder thing. 17mm thread IIRC :)

vennuth - car isnt going anywhere for the moment, just up on ramps while we sort this damn gearbox mount out. It should be ready to roll sometime next week :smokin:
Bet you can't wait :smokin:
 

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Discussion Starter #14
Pikey said:
It really isnt that bad, nowhere near as bad as getting to the filter. Its a big gold cylinder thing. 17mm thread IIRC :)

Hmm I cant even get my hand to it? I'm going to try and get my hands on a gauge tomorrow and give it a go. The problem is it's my daily driver so I really need it. If I manage to get the pressure test done and it does show a knackered pump I cant really drive it to a garage.

Anyone know what pressure levels i should be expecting cold and warm??? (assuming i manage to get a gauge and manage to actually dislocate all my fingers and get to the pressure switch).
 

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Discussion Starter #16
Well I have had a busy morning :D

First I went to halfrauds on the off chance they would have a mechanical oil pressure gauge. Well they didn't have a oil gauge but they did have a fuel pressure gauge which with some different fittings does exactly the same job.

Now for the sake of just diagnosing the problem i wasn't prepared to spend much. So i ask the spotty youth how much it was and off to the computer he went to find out, meanwhile I checked the catalogue above the gauges and it said £59.99!!! Sod that I thought! But then the youth returns and says "that’s £5 sir" :eek: ..... The moral of the story, halfrauds may be full of thick people but sometimes that’s a good thing :D

Anyway after mashing my hand into a bloody pulp I finally managed to get the pressure switch out. Once the mechanical gauge was in these are the figures I got:

Startup : 90 psi
2mins : 50 psi
Water at normal temp : 32 psi

oil at ~72C @ idle (1k rpm) : 32 psi
(2k rpm) : 50 psi
(3k rpm) : 75 psi
(4k rpm) : 85 psi

oil at ~80C (1k rpm) : 30 psi
(2k rpm) : 45 psi
(3k rpm) : 72 psi
(4k rpm) : 84 psi
(5k rpm) : 90 psi
(6k rpm) : Neighbours whould have killed me!

According to the RB26 manual it should be:
( 800 rpm) : ~21 psi
( 2k rpm) : ~43 psi
( 6k rpm) : ~65 psi

So to me my pressures look good. If anything they look to high to me? I there an oil pressure release valve somewhere? Does this seem about right?
 

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Top job mate, well done - especially for getting a pressure gauge for a fiver :D lol

Oil pressures are perfect mate :smokin:

Now you just need to get a permanent readout in the car. Either try and fix the standard system (new pressure switch, wiring check, new gauge) or just get an aftermarket oil pressure gauge / sender and install it somewhere else in the car.

Spa do a rather tasty oil pressure / oil temperature gauge which you could fit as a direct replacement to the standard oil pressure gauge in the centre console :)

Jeff
 

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Discussion Starter #20
Just about to order myself some nice Defi gauges (oil, boost and a pillar pod). :cool: It's still a little disconcerting having the standard gauge saying 0 pressure though. So i probably end up getting a new standard pressure switch too :)
 
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