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Wayne 962 Wayne 962 is offline
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Project 959 Continues: Oil Pressure Sender Replacement - Completed!

Hi everyone. After several months of not having any time to work on the 959, I was able to park it in my garage after the Callas Rennsport tech session this past Saturday. The Boxster project car is still over at Callas getting an alignment and corner balance, so I had some free space to wrench on the 959! This car is a lot of fun to work on, you can almost feel the spirit of the 962 race car - the car almost hums in the background, just waiting to get back on the track again (like the ark from Raiders).

Anyways, the 959 has a really advanced warning system unlike any of the other production Porsches from this era. The oil pressure sender and gauge are tied into an alert system: if the engine's RPM goes above a certain level and oil pressure is not high enough, then an ear-piercing alarm goes off. This alarm has been going off quite a lot in the car, and it's very annoying. At first I thought that it might be the oil pressure "idiot" switch, so I replaced that previously (959 Porn: Today's progress (10-23-07)). But that didn't fix the problem. So, I have to replace the more difficult-to-get-to oil pressure sender.

As with any big problem, the key is to replace the easy part first. In this case, the sender may be defective giving off a poor reading. OR, the engine may have a true oil pressure problem. So, every time this alert has been going off, I've been having to drive the car very cautiously, keeping the RPMs under about 3000 - very annoying. When I was having this problem, I once took off the air cleaner (while the car was running), and tapped on the canister with a long screwdriver, which temporarily fixed the problem. This led me to believe that the problem was with the canister. Not to ruin the end of the movie, but I did get the canister out, and it rattles really terribly inside. So, although I don't have the new one in yet, I'm about 99% sure that the sender is the problem.

Okay, here are some pics...
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Wayne R. Dempsey, Founder, Pelican Parts Inc., and Author of:
101 Projects for Your BMW 3-Series 101 Projects for Your Porsche 911 How to Rebuild & Modify Porsche 911 Engines 101 Projects for Your Porsche Boxster & Cayman 101 Projects for Your Porsche 996 / 997
Coming Soon:
101 Projects for Your MINI Cooper
Old 04-02-2009, 10:52 PM
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