my oil presher drops - Page 2 - 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.

Reply
 
 
 
Thread Tools Search this Thread
Old 03-23-2007, 12:28 AM   #11
Senior Member
Certified Car Nut
 
Join Date: Oct 2003
Posts: 19,756
Thanks: 0
Thanked 0 Times in 0 Posts
1993 SLE is on a distinguished road
Default

have you ever had a mechanical gauge on there to see if the pressure is infact dropping....the stock gauges are only for reference
1993 SLE is offline   Reply With Quote
Old 03-23-2007, 01:00 AM   #12
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Mar 2007
Location: Michigan
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
OakleyTW03 is on a distinguished road
Default

Quote:
Originally Posted by BillBoost37
The pumps in the 3800 are driven by the crank and are such that as Napa mentioned, they don't really go bad. It'* a great system.

Oil pressure is created as oil is forced through the crank and out the bearings and other bearing areas. The only pressure regulating item in the car is behind the oil filter adapter. The spring and slide regulate pressure based on spring pressure.

With the motor out, this would be an easy item to inspect and possibly replace. The oil filter adapter gasket (to my knowledge) is only available at the dealer or performance places like Intense/ZZP. Cost is ~$2.50 for the gasket.

My odometer doesnít work it didnít even when I got the car witch was 1 year ago it reads 176,000 and its got to be a good number over 200,000. The car has went through 2 Trans and im pouting in a 3rd. Tonight I am guna pull off my oil filter adapter and see what im working with
OakleyTW03 is offline   Reply With Quote
Old 03-23-2007, 02:02 AM   #13
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Mar 2007
Location: Michigan
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
OakleyTW03 is on a distinguished road
Default

The oil filter adapter is off, The spring and slide look and feel like new. It slides smoothly and i can push it in a ľinch ití* a really strong spring.

Im debating if im gnu take off the timing chan cover and take a look inside.
what do u think?

Name:  oilfilteradapteroffs.jpg
Views: 0
Size:  21.9 KB
OakleyTW03 is offline   Reply With Quote
Old 03-23-2007, 08:06 AM   #14
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

I forget how far out that piece should stick. I'm wondering if the spring might be getting weak or if I'm totallly in left field.

Going to ask Bill Buttermore and Bob Dillion to hop in here..they have much more experience in this area.
BillBoost37 is offline   Reply With Quote
Old 03-23-2007, 09:43 AM   #15
Junior Member
 
Join Date: Mar 2003
Location: Purgatory
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
vital49 is on a distinguished road
Default

Oakley - Please follow the posting guidelines found in this thread:

http://www.bonnevilleclub.com/forum/...ic.php?t=73691

This will help us help you!
vital49 is offline   Reply With Quote
Old 03-24-2007, 03:53 AM   #16
Senior Member
True Car Nut
 
Join Date: Mar 2004
Location: Ames, Iowa
Posts: 3,066
Thanks: 0
Thanked 1 Time in 1 Post
bill buttermore is on a distinguished road
Default

Boosty, I can't remember how far that little piston is supposed to stick out. Maybe Bob can? But, seems to me that buying a new spring would be the best way to tell. If the length and strength of the new spring are the same as the old one, then look elsewhere. Also check the piston and bore for scratches or scuffs or evidence that the piston was stuck in the bore. Otherwise, what has been said seems correct to me. That is, the higher the engine temperature, the lower the oil pressure. The slower the engine speed, the lower the oil pressure. But with 200K+ mileage, as the others have said, worn bearings are the likely cause.

Oil pressure is very sensitive to engine temperature. Some oils really thin down when hot. Was the car running hotter than it used to? Here are some things you can try in addition to the new spring. Try heavier oils: 15W-40 or even 20W-50 at your mileage. Run a 180 thermostat. Install a transmission cooler. It is not an obvious benefit, but in addition to making your transmissions live longer, a separate transmission cooler will drop your engine operating temperature (and increase your oil pressure) noticeably.

And, since the engine is out anyway, if you have the time, put it on a stand, pull the pan and plastigage the main and rod bearings. Better to find a bearing problem now than after it is back in the car.
bill buttermore is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Oil pressure drops (random) gmh5760 2000-2005 6 05-07-2012 01:16 PM
Oil Pressure Drops to Zero in Park Garb 1992-1999 32 08-09-2005 02:26 PM
oil pressure drops when sitting with foot on brake cvc 1992-1999 14 04-10-2005 04:01 PM
oil pressure gauge drops and stalled. Hojekang 1992-1999 14 08-01-2004 08:16 PM
Cruise control drops out TitZonAritZ 1987-1991 2 12-30-2002 07:48 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 12:54 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.