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 01-02-2003, 02:05 AM
Joseph_H's Avatar
Registered User
 
Join Date: Nov 2002
Location: Texas
Posts: 231
Oil gauge dropped to zero

Question 1:
Does anyone know what might cause an oil pressure gauge on my '95 E420 to drop momentarily to 0 while driving during cold outside temp then goes back up to 3. I checked the oil level and was fine and was changed recently. I am suspecting the oil pressure sending unit. any ideas? This only happened once while it was cold outside. No malfunction light came on.

Question2:
Is it easy to replace the oil pressure sending unit?

Question 3:
If anyone has specific instructions on how to change the oil pressure sending unit on a 95 w 124.034 (E420) would appreciate an e-mail or something.
__________________
Joe95E420

Last edited by Joseph_H; 01-03-2003 at 01:12 PM.
Reply With Quote
  #2  
Old 01-02-2003, 10:17 AM
JetForeman
Guest
 
Posts: n/a
I would say your definitely on the right track thinking it is a faulty oil press. sending unit. Do a search in the archives, or if my memory serves me correct, look at the bottom of your oil filter housing, you should see a single wire sending unit there.

Dale
Reply With Quote
  #3  
Old 01-02-2003, 02:54 PM
J.HIDALGO's Avatar
Registered User
 
Join Date: Jul 1999
Location: Jax, FL
Posts: 1,785
Well, you can try what I did with my car...

flushing your engine with an over the counter engine flush and then change your oil. Sometimes sludge will build up in the engine and since the oil sender unit comes in contact with your oil... Please note that MB does not recommend engine flush but, it worked for me. However, my symptoms were different. Low oil level light on when turning (specially to the left) and oil pressure gauge would fluctuate. Obviously, before you do this, check ALL your connections.

By the way, were you driving in a straigh line when you noticed this? ANy warning lights on in the instrument cluster?
__________________
J.H.
'86 300E
Reply With Quote
  #4  
Old 01-02-2003, 04:16 PM
Joseph_H's Avatar
Registered User
 
Join Date: Nov 2002
Location: Texas
Posts: 231
Re: Well, you can try what I did with my car...

Quote:
Originally posted by J.HIDALGO

By the way, were you driving in a straigh line when you noticed this? ANy warning lights on in the instrument cluster?
Yes, I was on the highway. Here are my conditions when this happens:
Cruising at 80MPH, outside temp was 40 degrees F and engine temp was 90 degrees C. This happened after about 25 minutes drive after the car sat outside for about 8 hours. The oil gauge dropped to 0 for about 10 seconds then it backed up to 3. No warning light whatsoever. I haven't seen it do that before nor did it do it again. I am keeping an eye on it and will check the connections to the sending unit whenever I get a chance (have to remove lower cover and crawl underneath car to do that).
__________________
Joe95E420
Reply With Quote
  #5  
Old 01-02-2003, 07:09 PM
Registered User
 
Join Date: Nov 2002
Location: florida
Posts: 83
hello to all
i had the same problem i change the oil pressure sending unit
problem fix
Reply With Quote
  #6  
Old 01-03-2003, 01:08 PM
Joseph_H's Avatar
Registered User
 
Join Date: Nov 2002
Location: Texas
Posts: 231
I ordered the Oil Pressure Sending Unit

It seems that everyone i talk to about this incident tells me it is the sending unit that is staring to act up. I should get it in few days and will install it myself since it seems to be a DIY type of thing. Does anyone know if I will need a special tool to remove and install it? The thing has a weird shape ... see picture.
Attached Thumbnails
Oil gauge dropped to zero-oilsender.jpg  
__________________
Joe95E420
Reply With Quote
  #7  
Old 01-03-2003, 04:09 PM
jbaj007's Avatar
Registered User
 
Join Date: Jun 2001
Location: Santa Monica, CA
Posts: 2,053
It's an easy task. The hex head on the picture is easily visible and accessable from underneath (17 mm., I think). Have the new one ready (with the aluminum crush washer for sealing) so you can slap it right in and not get much "moter erl" on yourself. Don't over torque.
__________________
The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
Reply With Quote
  #8  
Old 01-03-2003, 05:27 PM
Joseph_H's Avatar
Registered User
 
Join Date: Nov 2002
Location: Texas
Posts: 231
Thanks Jbaj

I hope the part comes with the washer you mentioned.
__________________
Joe95E420
Reply With Quote
  #9  
Old 01-03-2003, 06:36 PM
Piotr's Avatar
Registered User
 
Join Date: Jul 2002
Location: Middletown, DE
Posts: 739
Joseph, this is really more in the realm of maintenance than repair. If you have an easy access to it (I had to remove the air filter housing in my 190), it will take you 5-10 minutes. No sweat.
__________________
1985 190D 2.2l Sold-to Brother-in-law
1996 Mustang 3.8l -"thinks it's a sports car"
1988 Grand Wagoneer - Sold (good home)
1995 Grand Cherokee Ltd -"What was I thinking??!!"
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 09:03 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