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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 on  Mon May 17 19:34 CST 2021
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last visit: Wed Oct 8 19:11 CST 2014
[RELATED]

so I replaced my son's breather box when the aftermarket breather box it had in it broke in two and slathered oil all over everything.

I noted at the time that his oil pressure was seemingly (to me) very high at almost the top of the 5 bar gauge. I wondered if the high oil pressure blew up the breather box until others here told me that aftermarket boxes are not always that good and have broken before.

Needless to say I cleaned and buttoned it all back up and the pressure was still pretty high around 4.5 bar and 3.5 bar at idle after long warmup.

my son drove it for 2.5 months or so then it started to stall when it was wet out... once stalling when dry. I switched my S70 to him and took his 240 and noticed it was running kind of rough and saw the oil pressure gauge was hovering just above 1 bar!

so now I'm wondering if the oil pump seal/o-ring wore out suddenly or if the valves wore out that fast...

I'm afraid I'm pretty much a novice about anything from the valve cover to the oil pan.
--
2 1990 Volvo 240s - 1 is my son's sedan the other my 245 in restoration, 1 1999 S70 is my current daily driver until I can get back into the 245!






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