Oil pressure behavior - 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 04-20-2006, 04:48 PM   #1
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Default Oil pressure behavior

My oil pressure just kinda hovers between 40 and 60 when it'* cold, driving or idling. Once it warms up, it'll stick real close to 40 while moving, but at idle, depending on how long it'* been running, it'll get down as low as 12 psi sometimes. A little rev will bring it up to 40 for a few seconds, then it'll fall back down. Bad sign?
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Old 04-20-2006, 04:50 PM   #2
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Not a good sign. Might want to look into bearing replacement and what that entails.
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Old 04-20-2006, 04:50 PM   #3
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Default Re: Oil pressure behavior

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Originally Posted by J Wikoff
My oil pressure just kinda hovers between 40 and 60 when it'* cold, driving or idling. Once it warms up, it'll stick real close to 40 while moving, but at idle, depending on how long it'* been running, it'll get down as low as 12 psi sometimes. A little rev will bring it up to 40 for a few seconds, then it'll fall back down. Bad sign?
I have the exact same problem. could not have desribed it better.

Have a mechanical gauge to verify the 12psi reading?

I think it is part of the white curse.
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Old 04-20-2006, 04:51 PM   #4
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Like rod bearings?
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Old 04-20-2006, 04:51 PM   #5
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No, I've never put a guage on it.
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Old 04-20-2006, 04:54 PM   #6
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Yes, rod bearings.. maybe you and Hans can both check mechanically.

However with the pressure where you mention when cold or on throttle..that'* a classic worn bearing scenario
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Old 04-20-2006, 04:58 PM   #7
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Put a gage on it, and get the trur oil pressure... If it differs a good bit from the gage replace the oil pressure sending unit... If it tells the same story the gage does, start to worry

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Old 04-20-2006, 08:33 PM   #8
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Can the bearing be replaced on the car?
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Old 04-20-2006, 10:03 PM   #9
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Yes, you can. This is from a series II, but I'd think the series I would be about the same.

Connecting Rod Bearing
Service and Repair
.
Removal Procedure


* Tools Required
* J 41507 Connecting Rod Assembly Guide




1. Remove the oil pan.
2. Position the connecting rod to be serviced to Bottom Dead Center (BDC) by rotating the crankshaft.
3. Remove the connecting rod cap bolts.
4. Remove the connecting rod cap and lower connecting rod bearing. Important: Keep the bearings with the original connecting rod and cap. Do this in order to reassemble the connecting rod.
5. Remove the lower connecting rod bearing from the connecting rod cap.
6. Install the J 41507 to the connecting rod.
7. Use the J 41507, in order to push up the connecting rod and piston and access the upper connecting rod bearing.
8. Remove the upper connecting rod bearing.
9. Wipe the oil from the bearings.
10. Inspect the connecting rod bearings. Refer to, Crankshaft and Bearings Clean and Inspect.
11. Measure the bearing clearance.

Installation Procedure


* Tools Required
* J 36660 Electronic Torque Angle Meter
* J 41507 Connecting Rod Assembly Guide

Notice: Do not scrape, shim, or file bearing inserts. If the bearing surface of the insert is touched with bare fingers, the skin oil and acids will etch the bearing surface.

Important: Make sure that the connecting rod cap bolt holes and the connecting rod cap mating surfaces are clean and dry.




1. Dip the connecting rod cap bolts in clean engine oil.
2. Use clean engine oil in order to lubricate the bearing surface.
3. Install the upper connecting rod bearing.
4. Use the J 41507, in order to pull down the piston, connecting rod and upper connecting rod bearing.
5. Remove the J 41507.
6. Install the lower connecting rod bearing to the connecting rod cap.
7. Install the connecting rod cap.
8. Install the connecting rod cap bolts.
Tighten the connecting rod cap bolts to 27 Nm (20 ft. lbs.). Use the J 36660 in order to rotate the connecting rod cap bolts an additional 50 degrees.
9. Pry the connecting rod back and forth in order to check for binding. If necessary, loosen and then retighten the connecting rod cap bolts.
10. Measure the connecting rod side clearance
11. Install the oil pan.
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