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Too Much Oil Pressure? 700 1990

posted by  beemrdon on  Fri Apr 30 09:40 CST 2004
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last visit: Tue May 6 16:48 CST 2014
[RELATED]

Hi All,
I own a 1990 740 gl auto and it has about 185,000 mi on the clock. (one of)My new problem(s) is that the engine is leaking oil. Well, not just leaking but leaking pretty bad now, mostly under highway speeds. Oil has saturated all the way to the rear axle from driving. I have just gone through a quart in about 300 mi of mixed driving and the motor does not BURN oil. I noticed that oil has stained the valve cover around the oil fill cap and down to the bottom of the valve cover making a wide swarth. Not a lot there but it suggests to me that there is too much pressure for some reason. Is this cap supposed to have a small vent somewhere? I could not see one. I don't have an oil pressure guage and the idiot light has not come on as of yet.
I read on another post that these motors will leak around the distributor.Is that right? This one is in back of the rear of the valve cover and hard to view. It looks from the bottom of the car that the leak is coming from the rear of the motor somewhere. I am just hoping that it is not the rear main seal. I checked the flame trap and it is clean. The car runs ok but needs to be tuned again.
Any help or ideas that anyone can give will be greatly appreciated.
Thanks,
Don








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    Too Much Oil Pressure? 700 1990

    uid 7678's pic
    posted by  Yvan Lacroix on  Fri Apr 30 15:59 CST 2004
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    last visit: Fri Oct 3 13:45 CST 2014
    [RELATED]

    Ditto on what John said. If you have an older b20 volvo the oil fil cap has a hole in the to with a hose that goes to the intake. With one of these caps you can see if the internal pressure is elevated(if you don't have a classic volvo, at least buy a few, they are great investments;). Also I have purchased cars that the previous owners were ready to discard because thier mechanic quoted them an outragous price to change all the engine seals to fix leaks. I repaired more than 1 car with 2 miniuts time and a .69c investment. Change the seal on the oil cap, it's more that likely brittle and doesn't seal a thing. Also You can purchase at the parts store a dye that reacts to UV light, Claen the engine thouroly put the dye in and drive for 5 min(at night) then check with a uv light (cheap blacklight that plugs into lighter, available where they sell accessories)Your leak will glow making it easy to trace.

    Enjoy

    Yvan
    --
    65 122s/73 1800es/80 262c(350ci v8)/81 242na/89 745t/87 780/89 740/89 740t/ 86 745 and too many parts cars and projects to list








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    Too Much Oil Pressure? 700 1990

    uid 55's pic
    posted by  john sargent on  Fri Apr 30 10:04 CST 2004
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    last visit: Wed Oct 22 09:07 CST 2014
    [RELATED]

    Have you checked the oil trap, and made sure it is clean? If it is dirty, you'll have high crankcase pressure and oil will be forced out the seals.
    --
    john







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