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Oil Pressure

It's not a massive job to replace the engine compared with rebuilding it, partly because there is very little you would do when replacing it that you wouldn't have to do in a rebuild as well.

It's not a good first time rebuild proposition though I'd suggest as it has a number of unusual features and traps you can fall into.

Based on the time I've spent with my indie and my car I'd say 8-10 hours would see the engine swapped, but there will be extra time if there are any issues with things like an ECU swap due to loom differences, and if you have to swap ancillaries between engines then that is time, too.
 
If there is actually no oil pressure, the top end will rattle like a rattly thing. I would check the wiring to the oil pressure sensor.
 
Oil pressure switch? I'm assuming there is one!

Take a look at Clarks - http://www.clarks-garage.com/ - there is a trouble shooting section under oil pressure, hope that helps?

Cheers
Andy
 
I'm no mech but I know of people disturbing the wiring on the oil pressure sender/switch when doing other work on the car ( a garage did it to my 944) .

If there was no problem before hand then it has to be suspect number one surely ?

Best of luck

Mas
 
Hopefull it is just a disturbed wire but i cannot see any and i was unsure as to why both the oil pressure guage and the oil light would come on or are they both fed from the same sensor?
 
It is one sensor with 2 terminals, it lives on the drivers side, towards the front of the engine. You will have to get under the car.
 
From the symptoms you're describing (i.e. all fine before lay up and then some work) I would concur with other posters, most likely cause = oil pressure sender and/or faulty wiring. If you read the Clarks manual trouble shooting section for oil pressure readings it states that most false oil pressure issues are down to the sendor and/or gauge.

There are two wires into the sender, one = variable pressure 0 - 5 bar the other = 1bar low pressure warning light (large red light on dash).

I had a similar ish issue last year at the Ring - sender was going off and sitting at idle in the queue to get back into the car park the red warning light was flashing on. I replaced the sender (having carefully checked the wiring) and all is well again with a healthy +4 bar.

BTW, if you have to change the sender = bitch of a job ! Might be easier on a N/A car but very tight with oil pipes, PAS work and ARB mounts,

Chris
 
Looks to be plenty of room around the sender, may be one joy of an early car with no power steering!
How do i check sender or is it just a case of trying a new one?
Thanks for all help so far, just hoping it is nothing too serious. Tom
 
http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/387542-can-anyone-good-uninstalled-oil-pressure-sender-check-something-me.html

Just came across that - hope it helps.
 
Ok so i tested the sensor, and i was getting the same resistance weather the car was running or not, so i thought it must be the sensor, but a niggling doubt in my head said what if it is not the sensor and their really is no pressure, surely then i would also get the same resistance weather the car was running or not.
So i removed the sensor and turned the engine over expecting (hoping) to spray oil out of the hole thus proving that i have oil pressure and a faulty sensor, alas no oil came. So i removed the oil pressure relief valve and also turned the engine over, long shot but still hoping for some pressure to reveal itself, alas also nothing.
So now i am thinking i have got a broken oil pump or something, wondering if the pump could need priming? Or is it going to be a full strip down to reveal what is amiss?
Thank you for any help, Tom
 
Got the oil sorted (i hope) stripped the front belt covers off and felt a little daunted by the prospect of going further into the engine.
I was still baffled by the fact that the engine seemed to sound ok and not rough or tappety, as i would have imagined if their was no oil travelling around the engine.
So i thought i would try taking the pressure sensor out again, this time i blipped the throttle and ended up with oil everywhere! wahey!!! I think when i took the sensor out previously the oil ran out of the filter so it had to fill it back up before it would come out.
Then i put the car back together and refitted the sensor, when i next started the car the oil light went out and the presuure guage went up to 5, so i think all is well!
Just need to clean the inside of the wheel and garage next!
Any way happy days and thanks for all of your help Tom
 
Always a relief when you expect the worse and it turns out to be nothing, you wont be so miffed at having to clean all the oil up [:D]
 
Sounds like your gauge could be dodgy Mike with it going to full delfection with minimal volts. One of mine does it sometimes.
Alasdair
 
Hi Mike,

A long time since I had this problem ( about 15 years ) and it was on a 924S, had problems on a 944 turbo and a 944S too.

In fact I've had problems with a couple of senders one actually leaked through the body and to be honest the cars have got a bit mixed up in my memory as being down in the engine bay they look so alike close up and getting to feel personal!

Try changing the sender then if you still have the problem remove the instrument cluster and peel the membrane off the back to remove the instrument itself. You should be able to get a replacement from PH Sportscars at Shardlow about 20 miles from you, or alternatively try the other usual suspects.

changed the sender then found it needed a replacement gauge to fix it but didn't get around to changing the sender back to prove it out
 
Thanks guys for the ideas, however I have just changed the instrument pod, with the same results (I waited until I'd swapped them before posting) and it goes to full even with the sender disconnected.

 
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