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Charlane · Joined: 25 Jul 2005 Posts: 50 Location: San Antonio, TX

Just when I thought I had everything worked out and installed a bunch of new ground wires for solid grounding, the oil pump gives out. My local dealership quoted me $415 not to include shipping. Does anyone have a place to go where the price tag isn't so painful? I'm on short change and this is now my daily driver. Thanks.
_________________
Electra is Here......

One 1980 924 Turbo
One 1990 KZ1000P (CHPS) Motorcycle
One 1984 244 Turbo Volvo (B21FT) (I installed this engine myself)
One 1977 240D Mercedes Benz
One 1970 Chevy Impala

Mike924 · Joined: 12 Aug 2004 Posts: 2601 Location: IoW UK

What's up with the oil pump? Are you sure of your diagnosis?

It's a very simple unit and, unless something actually breaks off, I don't see that there's much to go wrong.
_________________
1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org

Paul · Posted: Sat Sep 02, 2006 12:08 am Post subject:

Has one checked to make sure the pressure relief valve is not stuck?
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

-nick · Joined: 16 Nov 2002 Posts: 2699 Location: Cambridge, MA

I've got an extra one lying around if you need it. Was giving excellent oil pressure before I pulled it off. Send me a PM
_________________
1980 931S
15psi boost, MS-II, EDIS, 951 IC, custom intake, Ford 5.0L throttle body, Forge BOV, WB o2, G31 w/LSD, 964 wheels, 968 rear sway, Bilsteins, 200# Welt. springs. A laptop, and a partridge in a pear tree.
1991 964 C4 Cabriolet

OutOfTheBox · Joined: 31 Mar 2006 Posts: 434

Charlane · Joined: 25 Jul 2005 Posts: 50 Location: San Antonio, TX

Hi Paul. You might be onto something there because the oil seal is leaking oil. I could see if the oil pressure backed up how this would affect it. I need to look into this more. Do you have any more information? I'm getting ready to take off the pump on Wednesday of next week because I'm working on location.

Thanks in advance.
_________________
Electra is Here......

One 1980 924 Turbo
One 1990 KZ1000P (CHPS) Motorcycle
One 1984 244 Turbo Volvo (B21FT) (I installed this engine myself)
One 1977 240D Mercedes Benz
One 1970 Chevy Impala

Paul · Posted: Sun Sep 03, 2006 5:22 am Post subject:

Are you replacing it because of the leak or due to the lack of oil pressure?

The pressure relief valve is very easy to check, it's part of the oil pump. All you have to do is to remove the big cover (looks like a large nut). Behind it you will find a spring and a small piston. Makes sure the piston moves freely.
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

Charlane · Joined: 25 Jul 2005 Posts: 50 Location: San Antonio, TX

Hi Paul. I thought that the oil pressure switch shut off the electrical start if there was a problem. My car starts. It just runs very rough after a while and now I understand why I'm getting flat lobes on my camshaft. There is just no oil reaching the top. This could be by blockage or because the oil pump is not functioning. I was reading in my Haynes where the oil pan should be removed and cleaned every 22K miles because it might block the oil feed tube, which makes sense to me.
_________________
Electra is Here......

One 1980 924 Turbo
One 1990 KZ1000P (CHPS) Motorcycle
One 1984 244 Turbo Volvo (B21FT) (I installed this engine myself)
One 1977 240D Mercedes Benz
One 1970 Chevy Impala

924RACR · Posted: Tue Sep 05, 2006 1:04 am Post subject:

No, most likely it's that the plastic cam oiler tube elbow, a $5 part, has failed, is leaking oil everywhere in the cam area, and not providing oil to the cam.

Parts you'll need to fix this:
cam cover gasket set - new
cam oiler tube elbow - new
camshaft - good used, or regrind - hey, time to upgrade!
lifters - good used, as needed, won't know how many you need if any till you get the old cam out

I recommend EBS Racing for the new parts. Should be able to get a replacement cam from someone here on the board, unless your budget allows an upgraded regrind. Same for lifters.

New oil pumps are like $400 or so. If your oil pump was bad, the whole engine would be trashed from top to bottom, not just the cam. Your oil pressure likely also reads low, since the sender is up there by the cam.

Sorry for the bad news, but on the bright side, this should be cheaper and easier than putting in a new oil pump.
_________________
Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

Charlane · Joined: 25 Jul 2005 Posts: 50 Location: San Antonio, TX

It's not that bad of news since I already knew that I had to replace the camshaft but I sure am glad that you wrote about that elbow. I read that somewhere before and it sure did get my interest and moreso when my car decided to put it on my table. Can I get that number to EBS from you? Where does that elbow sit btw? I think I'm going to get another oil pump anyway just to be safe.

One other thing. I read in my Haynes where the camshaft could be one of four choices because of timing differences in the North Americas (this must be relative to elevation I think). I have another camshaft I bought on the fly and I know it's for a 924 of the same year as mine but reading this makes me realize I need to find out for sure what this is all about. Do you have any info on the camshaft differences in timing for a given 924? This camshaft might fit but then some other nasty problem springs up and I don't want that to happen, no sir.

Thanks in advance.
_________________
Electra is Here......

One 1980 924 Turbo
One 1990 KZ1000P (CHPS) Motorcycle
One 1984 244 Turbo Volvo (B21FT) (I installed this engine myself)
One 1977 240D Mercedes Benz
One 1970 Chevy Impala

D Hook · Joined: 02 Nov 2002 Posts: 3158 Location: Omaha, NE

This is for your 931 (aka 924 turbo) correct?
_________________
'80 924 n/a SOLD

Charlane · Joined: 25 Jul 2005 Posts: 50 Location: San Antonio, TX

Damn, I need to pm Nick on that. He has a 931 I believe. I need to clarify the difference between 924 and 931. I do have what I believe to be the K-Jetronics setup (air flow diaphram/vacuum plate housing attached to the airbox/also known as a 'thingie') on mine but that shouldn't change the model number. What is the difference between the 931 and 924? Does it have anything to do with the crankcase or is this strictly dealership modification for the vacuum/exhaust system? I would have to determine where my booster would be if what I have is even that. I'm familiar with Swedish turbo systems but not Porsche....yet.
_________________
Electra is Here......

One 1980 924 Turbo
One 1990 KZ1000P (CHPS) Motorcycle
One 1984 244 Turbo Volvo (B21FT) (I installed this engine myself)
One 1977 240D Mercedes Benz
One 1970 Chevy Impala

Mike924 · Joined: 12 Aug 2004 Posts: 2601 Location: IoW UK

I'll try to keep this simple

Open your bonnet (hood).

Look inside.

If the 'thingie' is on your right-hand side, your car is NA (normally aspirated,at least originally) aka a straight 924.

If the 'thingie' is on your left, it's a turbo, otherwise known as a 931. You won't be able to see the turbo unit beacause it's tucked under the engine, but you will be able to see the induction pipe coming up from your left and over the top of the cam cover. It will have 'turbo' written on it. That's a bit of a clue.
_________________
1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org