oil pressure - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-28-2006, 06:08 PM   #1
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ok my motor was knocking the other day, crank bearing went bad. so today i had to move it so i figured i would start it and move it (im getting a new motor so not a big deal) i put it in the spot i wanted it to be in and the knock stopped and i had oil pressure again... my question it why did the pressure come back? yes there is metal in the oil. thanks
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Old 12-28-2006, 08:23 PM   #2
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The bearing probably spun and doubled up under itself, temporarily closing up the clearance under half of the journal, and quieting the knock. Oil pressure maybe came back because the bearing is now blocking the oil hole in the crank, which will also block flow to some other bearings I think. I'm betting it will look pretty nasty when you unbolt that cap. I replaced a crank on one where the bearing was actually extruded out of the rod and journal like thin taffy, leaving a spiral coil kinda' like a ribbon, all nice and blue colored from the incredible heat of friction. I think you will be safe leaving it parked.
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Old 12-29-2006, 08:30 AM   #3
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To paraphrase my fellow GH...

The motor was cold and would have decent pressure showing on the gauge until it warmed up.
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Old 12-29-2006, 08:40 AM   #4
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Quote:
Originally Posted by BillBoost37
To paraphrase my fellow GH...

The motor was cold and would have decent pressure showing on the gauge until it warmed up.
Well, sure Boosty, it COULD have happened that way too. But why offer a simple explanation when a complex one will do?
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Old 12-29-2006, 09:24 AM   #5
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Quote:
Originally Posted by bill buttermore
Quote:
Originally Posted by BillBoost37
To paraphrase my fellow GH...

The motor was cold and would have decent pressure showing on the gauge until it warmed up.
Well, sure Boosty, it COULD have happened that way too. But why offer a simple explanation when a complex one will do?
Us younger folks still have lives to lead...
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Old 12-29-2006, 07:52 PM   #6
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i just thought it was odd that is showed no oil pressure then had it again. thanks guys
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