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Low oil pressure

Well a bit of an update so far. The crank bolt wasn't finger loose at least, it seems tight but I will check the torque on it just to be sure.

I removed the OPRV and it's the old 3-piece type.

2013-07-06115524_zps8ded18ca.jpg


Worryingly when I went to undo it I didn't need any force - I couldn't unscrew it with my fingers at any point when trying to take it out but I needed very little force applied to the ratchet so maybe it wasn't tight enough in the first place? It wasn't leaking any oil out though.

I'm going to turn the eninge over with the valve out to check oil is coming out, re-insert it, check the crank pulley bolt then run the engine again to see if it's cured. Maybe the OPRV has just had it, I've read that the springs can go weak over time
 
Worryingly when I went to undo it I didn't need any force - I couldn't unscrew it with my fingers at any point when trying to take it out but I needed very little force applied to the ratchet so maybe it wasn't tight enough in the first place?
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It shouldn't need any force - doesn't need to be ridiculously tight. It's similar to when people do up the filler and drain plugs on gearboxes, often silly tight (and the next time they can't undo them).
 
No it really was not tight at all, I re-tightened to 45NM and it wasn't that tight to undo. Anyway, after about 8+ hours stuck under the car, I don't feel any further forward [:(] Here's the update of what I've done since the last post this morning;

1. Turned the engine over by hand with OPRV out, no oil came out the hole.
2. Put OPRV back in and turned engine over with coil lead and DME removed, no oil pressure
3. Removed oil filter and primed the oil pump (Poured oil in filter housing and turned engine over by hand backwards.)
4. Fitted new oil filter
5. Locked flywheel and checked crank pulley bolt. Torque was ok at 210NM

I then started the engine and it fired up ok, instantly went to about 3.5 bar oil pressure. Prior to starting with ignition on, oil pressure showed 0 and oil light was on. Then I left to idle and after engine was warm, about 10 minutes later oil pressure started to drop - same symptoms as yesterday.

I'm not sure if this helps diagnose anything but I took one wire off the oil pressure switch, with ignition on it still showed 0 and red light on. Then removed the other wire and with ignition on it reads 5 bar. I took this to mean that switch is ok, but then I guess that may not be so as there's no switch connected to the circuit at that point.

So after a long day under the car I guess I've at least checked some things but no solution still. My next plan is to change pressure switch, if that does nothing then change OPRV.

Elliot, I'll be PM-ing you in a mo!!
 
Andy,

Two thoughts;

1. Is it possible for the oil pump to fail in such a way as it is not pumping efficiently and hence is not producing the pressure in the first place? (This may be a stupid question, in which case I apologise!)

2. Do you happen to have the dimensions for the OPRV seal? Mine leaks and I don't know what size washer to replace it with.


Oli.
 
Hi Oli

Ref 1, I hope not as really don't want to have to be doing that! I'm guessing though if the oil pump fails, it just goes completely so I'd have no pressure at all. The engine still runs as good as ever and no strange performance or noises - I'm hoping it may be the sender although it's not usual symptoms for that.

Ref 2, mine doesn't have a seal - it's the early 3-piece one which doesn't have a seal. The later one has an O-ring which is approx. 10mm dia. I'd guess. You can get them from OPC still, I think it was only pennies?

Cheers
Andy
 
Well I'm very surprised but very chuffed tonight! Picked up a replacement sender today (cheers Elliot [;)]) and problem solved!! Really wasn't expecting that but so pleased I don't have to take the sump off or anything daft like that!

Happy days! [:D]

Thanks again for everyone's help [;)]
 
Oil pressure sender ?
Keep us posted on your findings Rob, hopefully something simple, usually is (fingers crossed)

Nice One [:)]
 
Great result! Very glad to hear it.

Doubly satisfying; not only is the repair simple, but the oil pressure was fine all along so no expensive damage done to your engine.


Oli.
 
Indeed. Had hoped but didn't expect this to be the issue but I was baffled as the engine sounded so sweet still. Everything has had a good look over though so all is well [8D]
 
Oh one thing I noticed at the weekend when I was checking the crank pulley bolt. There's what look like small balance weights stuck to the pulley. Did Porsche fit these or does it indicate that the engine has been apart and balanced at some point? There's nothing in the history file to show engine work to that level ever although that doesn't mean it didn't happen!
 
Aye spotted that on mine ! good engineering, i will bet loads of other manufacturers would not bother.
 

ORIGINAL: Hairyarse

Well I'm very surprised but very chuffed tonight! Picked up a replacement sender today (cheers Elliot [;)]) and problem solved!! Really wasn't expecting that but so pleased I don't have to take the sump off or anything daft like that!

Happy days! [:D]

Thanks again for everyone's help [;)]
Click to expand...

Orcam's Razor syndrome.
 

ORIGINAL: Frenchy

Aye spotted that on mine ! good engineering, i will bet loads of other manufacturers would not bother.
Click to expand...

Indeed - you can here the conversation - "well the long thready thing fits in the round spinny thing so that's all good then!"

Orcam's Razor syndrome
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I had to google that! LOL
 
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