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Oil pressure sender

TTM

TTM

Well-known member
It's located on the right side of the engine, at the bottom of the oil thermostat housing on which sits the oil filter. On an S2 it will point rearwards.
 
you might need a special tool* to get it off - access is quite tight. Never seen it on the 16v, but it's a bit awkward on the 8v and turbo. * - spanner cut in half [:D]
 
You'll recognise it as it is a bit like an upturned egg-cup with a couple of wires coming out of it. You can replace it without having to drop the oil, the sender itself contains a small quantity of oil which you'll probably loose as you unscrew it. Access is a PITA - my specialist concocted a spanner head welded onto its shank at a funny angle to enable him to get on it.
 
Chaps

It's been at least a week since we've had a thread about oil....[;)]

Moving on, I've gone to the car this evening and I have the oil pressure guage reading max and not getting below 4 bar even when hot. Quick spin through previous posts has me pointing the finger firmly at the oil pressure sender.

So, firstly can somebody advise where in the engine it is? And secondly, is there a quick fix (i.e. contact cleaner) or is a new sender the likely only option. As you know I am happy wielding some spanners, so I'll hopefully be fixing it myself.

Cheers

James
 
What is it with me and having to fashion my own tools!! Thanks chaps - is there anyway of knowing if it's kaput, or just a dodgy connection?
 
I thought that the gauge would peg at max if the sender was faulty. Can't harm trying a new one though - I have a spare (turbo) sender - don't know if they are the same
 
Hi, IIRC, you can get away by using a "Crow's Foot" wrench with either a 1/2 or 3/8th drive ratchet, also think it is either a 22 or 24mm, I can check to make sure if you wish to just purchase a Crow's foot from a tool shop. Regards Stu James just noticed, you are in Guildford, if you ever make it in the direction of Croydon or Bromley you are more than welcome to borrow the correct size Crow's foot. Stu
 
You don't need specialist tools, a normal open-ended spanner will do the job (just!) but it's a prize fiddle. It's much easier to access from underneath. Take the engine undertrays off (if your car still has them) and look up, under the drivers' side of the engine. It's as Scott said - like a small egg-cup sized cylinder with a couple of terminals on top of it. It looks tempting to grab the thing with your hands and unscrew it, but you risk breaking it if you do this; underneath it is a nut which you need to get the spanner onto, and you can loosen it that way. However, as has been said, when this fails it usually fails either to max or to min (it shorts to earth or +12v). I've never heard of one failing and giving an artificially high but variable reading. Are you sure there isn't a blockage anywhere (guessing here), or possibly the oil pressure release valve is playing up? If you have access to another pressure gauge it may be worth using this to see what the pressure really is, and work from there. Oli.
 
It's a good point Oli and one worth investigating, although my symptoms match those explained at the Clarks site [link=http://www.clarks-garage.com/shop-manual/lube-03.htm]here[/link]. I shall monitor it over the next few days as I know the car has plenty of oil, and has shown no oil pressure issues before so I'm happy driving in the short term "blind" to the real oil pressure. Stu - thanks for the offer. I am fairly regularly over in Sandersted so if I have no joy with my open ended spanner I may well take up your generous offer of tool loan. ETA: Let's hope it's not the pressure release valve, that's £228 from the local OPC!
 
James, You're not as blind as you think; there is also a low-oil-pressure warning system built in, so if things are really bad you will be informed. Doing what you are doing is not as much of a risk as it may appear to be. (Most cars don't have an oil pressure gauge anyway - just the warning system.) Pressure release valve problems almost always go away with a good engine flush and oil change, and if that fails they can be taken out and cleaned. I don't think I have ever heard of anyone needing to replace one. Oli.
 
HI James, good luck with the issue, and Sanderstead is not far from me so if you do need the Crow's foot, just let me know a day or so before and I will meet up with you and hand over. It is as I said a 24mm and I also understand that whichever spanner u use it need to be quite thin, mine has not been used for this particular job so is standard thickness. So let me know and I will grind it down, it is not often I would use a 24mm and the torgue on the pressure switch is only 24ft lbs (35mn) so it is not an issue for me. Cheers Stu
 
I am pleased to report that whilst other parts of my 944 are giving me grief, this issue has been quickly sorted. While under the car investigating I discovered that one of the wires had come adrift from the oil pressure sender so quickly popped it back on and........ all sorted. Thanks all for the suggestions for tooling and tool modifications.
 
James, Glad to hear it ... that sounds like the sort of 'fault' I could do with more often (namely, very very simple fix!) Oli.
 
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