924Board.org

blurred_line · Posted: Fri Aug 06, 2010 4:18 am Post subject: Oil Pump?

I'm currently rebuilding the motor in my 81 931, my question is should I replace or rebuild my oil pump? I noticed that a new one is over $600! What have you guys done?
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1981 924 Turbo

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

blurred_line · Posted: Fri Aug 06, 2010 6:04 am Post subject:

Thanks ideola! I'll also be ordering some stuff from you throughout the project.
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1981 924 Turbo

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Cool, let me know how I can help. And FWIW, if your pump ever does fail, I have several spares that I've been stock-piling...
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erstwhile owner of just about every 924 variant ever made

v8carreragts · Joined: 05 Sep 2003 Posts: 665 Location: Tucson, AZ

I had an oil pump failure once. A really odd one. My ex-wife came home from work one day in her 82. She pulled into the driveway and shut it off. A little while latter it wouldn't start. I thought it was something with the starter because the solenoid clicked but it didn't spin the engine. So I got in and rolled it backwards (we had a long sloping driveway) and let the clutch pedal up and it skidded to a stop. The engine was locked.

I pulled the engine expecting the worst. I took off the oil pan and everything was perfect. Nothing broken. The head and cam looked the same. I was stumped until I took off the oil pump. What happened was a piece of TIG wire got logged between the outer oil pump gear and the casting. This is what locked the engine. I brought it to work and we froze the gear with nitrogen and heated the casting and we couldn't get it out. Then we just cut the casting. The piece of TIG wire was fused to the gear and it cut into the casting.

I looked at the pick up and the screen was in perfect condition but it looked like a piece of TIG wire had broken off from inside of the pick up from the weld between the tube and the large end. All I can figure was that it took 82000 miles to break off and it happened just as she turned off the engine.

peterld · Posted: Mon Aug 09, 2010 12:07 am Post subject:

The oil pump is the least of your worries...like much of the basic bottom end structure of the 924 it is over-engineered and very sturdy. certainly you should disassemble it , check it and clean it, but I doubt very much you will find any significant wear.
One of mine has done over 200k and was on the motor when shrapnel from a piston spread itself throughout and yet is most serviceable. As Dan mentioned - relief springs can go 'soft' but usually that's it.
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80/81 932/8 ROW

blurred_line · Posted: Mon Aug 09, 2010 12:01 pm Post subject:

Can you get a "rebuild kit" or a spring replacement? If I'm pulling the engine out and doing a rebuld/ clean the if I can replace it now rather then later that would be perfect.
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1981 924 Turbo

Paul · Posted: Mon Aug 09, 2010 12:25 pm Post subject:

Don't worry, it's very easily replaced even with the motor in the car. If it's not broke, don't fix it.
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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.