Parkhurst,

I also think that low oil pressure caused by worn bearings would come on gradually.

Though you don’t have many miles on the oil and filter, I think you need to eliminate that as a cause even if it is not the problem.

Many oil filters have check valves in them, so maybe it is possible that they could cause a problem, or the filter media may have collapsed. I think the oil should bypass it if this happens, but I’m not sure.

For something that could cause a rapid drop in oil pressure, the oil pressure relief valve comes to mind. It could be stuck or have a broken spring. Unfortunately, though I’m not sure, I think it isn’t accessible from the outside of the engine.

Anyway, here is the low oil pressure list from the trouble shooting guide in the Intereurope workshop manual for the Saab V4:

e) Faulty oil pressure gauge, switch or wiring
f) Relief valve defective
g) Oil pick-up pipe strainer blocked
h) Oil filter over-flow valve defective
i) Worn oil pump
j) Damaged or worn main and/or big-end bearings
k) Incorrect grade of engine oil
l) Oil level low
n) Oil leak of the pressurized side of the lubrication system

I didn’t leave “m” out. It is not for that symptom.

Cheap Charley


posted by 64.12.116...

• Oil Pressure running at 20 psi. Is that too low?, Parkhurst, Wed, 6 Feb 2008 20:19:13
  • Me too - maybe a little different problem, Bob Conolty, Sun, 17 Feb 2008 15:12:00
  • Re: Oil Pressure running at 20 psi. Is that too low?, Bob Smith, Sun, 10 Feb 2008 17:14:29
    • Light was removed, but gauge never shows < 18 psi..., Parkhurst, Mon, 11 Feb 2008 08:29:16
      • Re: Light was removed, but gauge never shows < 18 psi.., Bob Smith, Mon, 11 Feb 2008 17:46:02
        • W H A T _ E L S E _ S H O U L D _ I _ DO . . ., Parkhurst, Tue, 12 Feb 2008 07:42:05
          • Re: W H A T _ E L S E _ S H O U L D _ I _ DO . . ., Cheap Charley, Tue, 12 Feb 2008 09:08:52
            • Re: W H A T _ E L S E _ S H O U L D _ I _ DO . . ., Parkhurst, Tue, 12 Feb 2008 09:25:15
              • Re: W H A T _ E L S E _ S H O U L D _ I _ DO . . ., Cheap Charley, Tue, 12 Feb 2008 09:44:16
                • You're right. Sorry! nm, Parkhurst, Tue, 12 Feb 2008 10:51:47
      • Re: Light was removed, but gauge never shows < 18 psi..., Cheap Charley, Mon, 11 Feb 2008 10:18:23 <-- Viewing This Message
  • Is it possible that the copper oil..., Parkhurst, Sat, 9 Feb 2008 15:04:54
    • Re: Is it possible that the copper oil..., Cheap Charley, Sat, 9 Feb 2008 21:43:54
  • Re: Oil Pressure running at 20 psi. Is that too low?, kansas, Thu, 7 Feb 2008 15:17:11
    • Re: Oil Pressure running at 20 psi. Is that too low?, Parkhurst, Fri, 8 Feb 2008 14:08:35
      • Re: Oil Pressure running at 20 psi. Is that too low?, Parkhurst, Fri, 8 Feb 2008 20:11:04
  • Re: Oil Pressure running at 20 psi. Is that too low?, Brian, Thu, 7 Feb 2008 05:54:06
    • Re: Oil Pressure running at 20 psi. Is that too low?, Parkhurst, Thu, 7 Feb 2008 08:31:52
      • Re: Oil Pressure running at 20 psi. Is that too low?, Brian, Thu, 7 Feb 2008 12:56:14

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