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Driver
 
Join Date: Jan 2004
Location: Gahanna, Ohio
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Oil Pressure Relief Valve

OK, can somewhat tell me where this thing is? I mean I need CLEAR directions!

Also info I what I need to do to remove it (once I find it) how difficult it is etc. would be most appreciated.

Thanks!

GHEN
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Old 02-04-2004, 05:50 PM
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Standing at the front of the car looking at the engine.

Under the oil filter on the left.

Behind the oil pressure sender.

Item 36.

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Hugh - So Cal 83 944 Driver Person
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When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
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Old 02-04-2004, 07:51 PM
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Thank you Hugh!

A couple of follow up questions if you don't mind:

1. Can I access t from the top or the bottom?

2. What do I need to remove to get to it?

3. Do I simply unscrew it and screw in the other, replace any oil lost, and I'm done; or is it more involved than that?

Thanks again,

GHEN
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Old 02-05-2004, 05:36 AM
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Also, is it worthwhile to try and clean it before I buy a new one, or is that not feasible?
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Old 02-05-2004, 05:47 AM
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The real question is why do you want to change it?

But to answer your others:

Access is only from the bottom.

Either a 17 mm or 19 mm hex head. Unscrews nomally.

Should replace the O-ring if you think there is any oil pressure problems.
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Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
New Users please add your car's year and model to your signature line!
Never break more than you fix!
Old 02-05-2004, 07:09 AM
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If you are experiencing low oil pressure readings without any other low pressure symptom:
Check item #41 in the drawing, the oil pressure sending unit. I replaced the relief valve on my N/A and found no change in the guage reading, changed the sending unit and magically the pressure registered on the guage as normal. I have heard that a switch in lubricants can throw the sending unit into a low reading reaction.
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Old 02-05-2004, 07:18 AM
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Have plenty of oil, but showing low pressure once the car gets up to operating temperature.

Appreciate the help
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Old 02-05-2004, 07:19 AM
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What is low oil pressure?
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Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
New Users please add your car's year and model to your signature line!
Never break more than you fix!
Old 02-05-2004, 07:25 AM
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I'll give the whole story:

I was experiencing some starting / stallings problems, so I added some gumout fuel system cleaner and some heet to my fuel tank. At the same time I added some 4 cylinder formula engine restorer to my engine oil (recommended by a friend). This is a thick blue liquid.

I took the car out to get everything moving through the system when I noticed a huge cloud of blue smoke belch from my muffler. Concurrent with that I saw my oil pressure drop to 1.5 bar while driving. My car has never blown smoke before, and the oil pressure sender is about a week old and working perfectly before this.

I pulled over and checked the underside expecting to see major oil leakage...nope . I drove the car home (at times smoking heavily) along with oil pressure between 1.5 & 2.5 bar.

I checked the oil when I got home and it is full.

I was hoping that the blue cloud was the the fuel systen cleaner degunking something and it was getting burned up, but that is probably wishful thinking. Now I am thinking it was that blue gunk and something has gone wrong.

With low pressure and no significant leaking, I am thinking it may be the OPRV.

Any thoughts or help would be greatly appreciated.
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Old 02-05-2004, 08:03 AM
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BTW,

Driving the car it feels strong and sounds smooth. Although there is still some smoking.
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Old 02-05-2004, 08:05 AM
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Drain the oil and replace with fresh. Use a new filter too. You just might have to change the oil a few times to clear the system.

Stay away from 'Mechanics In A Can' solutions to your engine/performance problems. A quality injector cleaner is OK but NOT the thick oil additives. ATF is sometimes used as a cleaning additive right before an oil change -- mostly for noisy lifters.

Most performance problems with the 944 are DME in nature. That is the electronic fuel injection system and it's supporting electricals and vacuum manifold.

There is a structured testing plan to go through so you don't check something twice.
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Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
New Users please add your car's year and model to your signature line!
Never break more than you fix!
Old 02-05-2004, 08:42 AM
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Check your coolant tank for oil. If so cooler seal kit is needed. Sman
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Old 02-05-2004, 03:47 PM
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