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Sudden shift of oil pressure from 4.5 bar to less then 2 bar over 2.5 months 200 1990

posted by Art Benstein on Tue May 18 14:22 CST 2021
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last visit: Fri Oct 17 20:10 CST 2014

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The sudden reduction of oil pressure could be explained by a common o-ring displacement at the end of the oil delivery tube output from the oil pump. I can't envision a connection between oil pressure and crankcase ventilation pressure which you'd see as an oil leak around seals, oil dipstick, cam cover, and of course, that aftermarket oil separator.

Rough running is often a vacuum leak. Stalling when wet has so often been a distributor cap in my experience, followed closely by a worn old set of ignition wires.

A '90 240 doesn't come with an oil pressure gauge, and its stock warning switch is set at 0.5 bar (7 psig) so your added gauge sender is always a suspect tracking over long term, especially as to the 4.5 bar history.

What is the oil maintenance history? Filter change affect the trouble?

--
Art Benstein near Baltimore

Nobody sees a flower - really - it is so small it takes time - we haven't time - and to see takes time, like to have a friend takes time. - Georgia O'Keeffe

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Sudden shift of oil pressure from 4.5 bar to less then 2 bar over 2.5 months [200][1990]
posted by Strackerjack subscriber on Mon May 17 19:34 CST 2021 >

Sudden shift of oil pressure from 4.5 bar to less then 2 bar over 2.5 months [200][1990]
posted by OwenF on Tue May 18 01:28 CST 2021 > V
- Sudden shift of oil pressure from 4.5 bar to less then 2 bar over 2.5 months [200][1990]
  posted by derek uk subscriber on Tue May 18 05:31 CST 2021 > V
- Sudden shift of oil pressure from 4.5 bar to less then 2 bar over 2.5 months [200][1990]
  posted by Strackerjack subscriber on Tue May 18 09:10 CST 2021 > V
  - Sudden shift of oil pressure from 4.5 bar to less then 2 bar over 2.5 months [200][1990]
    posted by OwenF on Tue May 18 10:19 CST 2021 > V
    - Sudden shift of oil pressure from 4.5 bar to less then 2 bar over 2.5 months [200][1990]
      posted by Strackerjack subscriber on Fri May 21 08:07 CST 2021 > V
  - Sudden shift of oil pressure from 4.5 bar to less then 2 bar over 2.5 months [200][1990]
    posted by someone claiming to be Volvodad on Wed May 19 17:50 CST 2021 > V

Sudden shift of oil pressure from 4.5 bar to less then 2 bar over 2.5 months [200][1990]
posted by james_a_sousa subscriber on Tue May 18 12:10 CST 2021 > V

Sudden shift of oil pressure from 4.5 bar to less then 2 bar over 2.5 months [200][1990]
posted by Art Benstein subscriber on Tue May 18 14:22 CST 2021 > V
- Sudden shift of oil pressure from 4.5 bar to less then 2 bar over 2.5 months [200][1990]
  posted by Strackerjack subscriber on Mon May 24 16:48 CST 2021 > V
  - Sudden shift of oil pressure from 4.5 bar to less then 2 bar over 2.5 months [200][1990]
    posted by Art Benstein subscriber on Mon May 24 18:15 CST 2021 > V
    - Sudden shift of oil pressure from 4.5 bar to less then 2 bar over 2.5 months [200][1990]
      posted by Strackerjack subscriber on Tue May 25 20:22 CST 2021 > V
    - Sudden shift of oil pressure from 4.5 bar to less then 2 bar over 2.5 months [200][1990]
      posted by Strackerjack subscriber on Tue Jun 8 09:57 CST 2021 > V
      - Sudden shift of oil pressure from 4.5 bar to less then 2 bar over 2.5 months [200][1990]
        posted by Art Benstein subscriber on Tue Jun 8 14:36 CST 2021 > V
- Sudden shift of oil pressure from 4.5 bar to less then 2 bar over 2.5 months [200][1990]
  posted by Strackerjack subscriber on Tue May 25 20:13 CST 2021 > V

Sudden shift of oil pressure from 4.5 bar to less then 2 bar over 2.5 months [200][1990]
posted by Strackerjack subscriber on Fri May 21 08:24 CST 2021 > V

Sudden shift of oil pressure from 4.5 bar to less then 2 bar over 2.5 months [200][1990]
posted by Strackerjack subscriber on Mon May 31 12:41 CST 2021 > V

Sudden shift of oil pressure from 4.5 bar to less then 2 bar over 2.5 months [200][1990]
posted by Strackerjack subscriber on Mon May 31 13:18 CST 2021 > V

Sudden shift of oil pressure from 4.5 bar to less then 2 bar over 2.5 months [200][1990]
posted by Strackerjack subscriber on Fri Jun 25 09:35 CST 2021 > V

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Sudden shift of oil pressure from 4.5 bar to less then 2 bar over 2.5 months 200 1990