Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 10-10-2002, 01:58 AM
Registered User
 
Join Date: May 2001
Location: Las Vegas, Atlanta
Posts: 669
Oil pressure at idle...is 1 bar too low?

I am looking to purchase a 500SL. All but one of them have what I tend to regard as low oil pressure at operating temperature while idling. Is this normal, even allowing for the possibility of light-weight oils? (One I drove today was about 2.5 bars at idle -- same as my 300SL).

Last edited by bobterry99; 10-10-2002 at 02:21 AM.
Reply With Quote
  #2  
Old 10-10-2002, 02:02 AM
MikeTangas's Avatar
Senior Member
 
Join Date: Apr 2000
Location: So. Cal
Posts: 4,430
That's still within acceptable limits. Specs allow the idle pressure to go as low a .3 bar at temp, as long as the gauge pegs by 1K RPM.

FWIW my 4.5 shows 1 bar (~15PSI) idling at temp while the 5.6 show 1.5 bar. The 4.5 pegs as soon as it is off idle and the 5.6 pegs well before 1K RPM. What did this car do upon accelerating?
__________________
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.
Reply With Quote
  #3  
Old 10-10-2002, 02:04 AM
Registered User
 
Join Date: Jan 2002
Posts: 352
Year and mileage. Did you register the 1 bar at cold startup or after you drove it around for awhile. Looking at the cluster, I think it is the R129 90-95 sl. If so, it would be equiped with the M119 Motor. I have had two oil pressure problems with my 99 s420 and the dealer replaced oil pump and oil sending unit. If this is the problem then it shouldnt cost more than $700 to fix. If you got 1 bar on a cold startup then something is very wrong. How did the needle move, did it quickly pin to 3 or slowly?
Reply With Quote
  #4  
Old 10-10-2002, 02:27 AM
Registered User
 
Join Date: May 2001
Location: Las Vegas, Atlanta
Posts: 669
These cars are 93s and 94s with between 40K and 95K on the clock. In my original post I included a picture, but in a subsequent edit I lost same and can't get it back! Oh well.

The car that has 2.5 bar at operating temperature and idle is a '91 with 120,,000 miles. I actually drove this car. All of the ones with low oil pressure are being sold on eBay. I can see the temp. gauge and have nothing else to go by.
Reply With Quote
  #5  
Old 10-10-2002, 12:36 PM
yal's Avatar
yal yal is offline
Benz-smart
 
Join Date: Oct 1999
Location: New York, Long Island
Posts: 2,705
The type of oil used and how long the car has been running can dictate the oil pressure at idle. So if you use synthetic and have been driving for a few hours it will be pretty low (around 1 on my car anyway) but if you are using dino oil it will be up a bit and if you have been driving or idling for less than 30 or so minutes it stays up there in the 2-3 range until the car really gets going for bit.
Reply With Quote
  #6  
Old 10-10-2002, 02:36 PM
Holson Adi's Avatar
Registered User
 
Join Date: Jul 2001
Location: Boston, MA
Posts: 2,561
Am I right then to say that the oil pressure is not indicative of an engine's health?

Check this out... low oil pressure.. 7000 mi! The 98F temperature worries me a little too. But then again the idle speed of this car is pretty low. Is it the way it's supposed to be?

http://www.ebizautos.com/fischermotors/photo_viewer.cfm?iid=4191&w=830&pid=11

It's the cleanest old car I have ever seen...
That engine bay is sooo clean...
Beautiful SL.
__________________
2008 BMW 335i Coupe
Reply With Quote
  #7  
Old 10-10-2002, 02:53 PM
yal's Avatar
yal yal is offline
Benz-smart
 
Join Date: Oct 1999
Location: New York, Long Island
Posts: 2,705
It looks perfect to me.




Anybody else think so?
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 03:26 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page