Question about 1991 Geo Metro

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1991 Geo Metro very low oil preasure at idle

1991 Geo Metro very low oil preasure at idle (5lbs)when cold and when it warms up no oil preasure at idle and only 35lbs at 3000 rpm.
Engine has lots of miles 100k plus. Bottom end sounds fine. Compresion is 85lbs,150lbs and thrid cyc is 105lbs...
Can the cam shaft bearing be bad? This means replacing the head??

Thanks for any help/ideas...

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  • Mike Heltborg Sep 12, 2009

    Hi Folks,
    Yes I tried heavery oil, replaced the oil pump and I have a oil preasure gage on the car right now...
    Also does any one know if the oil preasure is set by the cam shaft clearences?
    I have a another head that is good condition that I can put on this block.
    But I need to put some oil in the cycs and recheck compression first...

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Your compression indicates you need to replace your rings and head gasket and the oil pressure issue tells me you need to repair your oil pump. Basically you need to rebuild the engine as once you get all these parts off you might as well do the rest of the service. You have to disconnect the connecting rods anyway to do the rings so you may as well have the crank serviced if you are pulling the engine out. This will let you have both roods and crank turned and the bearings matched.

Posted on Sep 12, 2009

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Try heavier wt oil, check oil pump pressure, replace oil pump if needed

Posted on Sep 12, 2009

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I had a 97 Geo 3 cyl. motor overhauled for 850$. If you are somewhat of a gearhead, they arent too hard to take in and out. Just peel back the intake and exhaust and leave them untouched. Motor only weighs about 175#.

Posted on Sep 13, 2009

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