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 > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 05-04-2009, 02:29 AM
Basstrip
 
Join Date: Dec 2008
Location: California
Posts: 111
Question temp gauge, what's the trick to repair?

92 300SD temperature gauge goes up an down, some times is steady and some times jumps. It will go steady after I put presure on the back of gauge with my finger. My question is, is there something to replace the gauge?. Can we exchange parts of it with out changing the whole gauge unit?. Can the miles be reset if I buy a used from recycling yard? Please advise.
Reply With Quote
  #2  
Old 05-04-2009, 03:21 AM
ForcedInduction
Guest
 
Posts: n/a
Change the sender on the engine.
Reply With Quote
  #3  
Old 05-04-2009, 05:28 AM
oldsinner111's Avatar
a parent should die first
 
Join Date: Nov 2008
Location: bristol,tn
Posts: 5,087
Also check the plug, on mine the plug opens.The wire had come losse,and I resolder it.
Reply With Quote
  #4  
Old 05-04-2009, 11:33 PM
nickofoxford's Avatar
2 doors, 5 cylinders
 
Join Date: Jul 2008
Location: S.E. PA
Posts: 447
As said, i'd resolder as much as possible on or around the gague, sounds like it could be a loose ground too.
Reply With Quote
  #5  
Old 06-26-2011, 10:23 AM
Registered User
 
Join Date: Dec 2009
Posts: 427
Whats the easiest way to get to this temperature gauge and where is the sender located?
Reply With Quote
  #6  
Old 06-26-2011, 10:42 AM
oldsinner111's Avatar
a parent should die first
 
Join Date: Nov 2008
Location: bristol,tn
Posts: 5,087
Like the w123 cars,I also added a ground to my dash.The sender on the side of the head is for the gauge.The one near thermostat is for the glowplug unit.As I said before the plug on these senders open up.Some times the wire breaks I had to solder mine.
Reply With Quote
  #7  
Old 06-26-2011, 11:24 AM
Jeremy5848's Avatar
Registered Biodiesel User
 
Join Date: Mar 2006
Location: Sonoma Wine Country
Posts: 8,393
Quote:
Originally Posted by jmbeam View Post
Whats the easiest way to get to this temperature gauge and where is the sender located?
Pull the cluster and take it apart. The three gauges (fuel, oil pressure, coolant temp) are a unit and that is the only way to replace it. You do not have to replace the whole cluster so don't worry about resetting miles. The cluster is in 3 parts -- gauges, speedo, clock/tach. They are separately replaceable. Speedo and clock/tach may vary from model to model, the gauges are all the same except that gassers get a vacuum "Economy" gauge and later ones say "Must use unleaded gas." My '87 300D in fact has a cluster from a gasser, it works just like the diesel ones.

It is theoretically possible to take a gauge apart but I don't recommend it. As the others have speculated, you probably have a bad connection somewhere in the cluster.

The sender is located in the water jacket, on the left side of the block at about the midpoint. You have an OM602 engine and I am not quite as familiar with it as I am the 603. If you can put your finger on the gauge and it stops jumping then it is probably not the sender.

Jeremy
__________________

"Buster" in the '95

Our all-biodiesel family
1995 E300D (W124) . .239,000 miles My car
1996 E300D (W210) . .313,000 miles Wife's car
Santa Rosa population 170,685 (2012)
Total. . . . . . . . . . . . 722,685
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
Reply With Quote
  #8  
Old 06-26-2011, 01:51 PM
Registered User
 
Join Date: Feb 2011
Location: Redding, California
Posts: 219
Sounds to me like an electrical short somewhere between the sender and the gauge. Could be a crystallized or corroded joint in the wiring.

As for taking the gauge itself apart, it's quite simple. You have the windings which plug into the circuit board. If you pull the needles off all the gauges and remove the faceplate, the winding for the gauge comes right off the pins. You might clean off the corrosion and resolder the circuit board, which also is known to crystallize the solder joints leading to poor connections.



This is the bare circuit board with gauges removed. In the center/left you see two connectors for the windings of the fuel gauge. Above center are the two for the fuel gauge and to the right, the oil. Picture taken just before resoldering all the connections.

If you choose to pull it apart, repaint your needles while you have them off, much easier that way.

Last edited by Bob338; 06-26-2011 at 04:39 PM.
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 06:59 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page