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-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 04-14-2000, 10:27 PM
dacia's Avatar
Member of the board
Join Date: Mar 2000
Location: Here.
Posts: 315
This is a follow up to my previous post.
My speedometer stopped working on Thursday on my '86 300E. I checked the cable while I was driving and it was spinning. Today I took out the instrument cluster spinned the speedo and it is running, the odometer is working as well. Now what? Benzmac suggested it may be the plastic gears inside the tranny. Would it be a DIY job, does the transmission have to come off for this repair? Also is it possible that the end of the speedo where the cable joins it wears out and the cable just spinns inside of it. Because when I am driving the car I hear a whirring sound coming from behind the instrument panel.
But there is no movement at the speedo. Of course the sound was not there before the speedometer quit.
Thanks for your advice.


Reply With Quote
Old 04-14-2000, 10:39 PM
Registered User
Join Date: Jan 2000
Location: New Bedford, MA USA
Posts: 1,583
Quick check for speedo gear in tranny. Get the car up in the air, disconnect the speedo cable at the tranny, push a q-tip into the square hole that the end of the cable goes into. start the engine, select Drive and then get under the car to see if the q-tip is spinning. If it is, grab the end of the q-tip and see if the gear still wants to turn. If the gear continues to turn, it's your cable. If not, then it's either the pinion gear on the speedo cable fitting in the tranny (can be removed) or the worm gear on the tailshaft (not likely suspect, rare failure item) Of course, be sure that all safety considerations are observed with the vehicle on a lift. I believe that if the gear is broken, the tailshaft can be removed w/o dropping the whole tranny, but, I am not sure. Maybe Benzmac has that answer.. Good luck..

Jeff L
1987 300e
1989 300e
1987 BMW 325
Reply With Quote
Old 04-15-2000, 11:01 PM
dacia's Avatar
Member of the board
Join Date: Mar 2000
Location: Here.
Posts: 315
Thank you for your advice Jeff. I did exactly what you suggested and the q-tip is turning.
But so does the cable at the other end of it when it is connected at the tranny. In anycase I will replace the cable it is not that expensive. Thanks again.

Reply With Quote
Old 04-16-2000, 08:59 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
This might be a good time for a little instrument cluster removal warning.

On clusters with cable type mechanical speedos, you must disconnect the speedo cable from beneath before pulling the cluster. Many will pull the cluster just far enough to reach behind to unscrew the cable. Doing this stretches the cable housing. When this happens the cable doesn't have enoug length to reach one or the other end.

The way you describe the problem sounds like this has happened.

Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician
Reply With Quote
Old 04-17-2000, 06:33 PM
dacia's Avatar
Member of the board
Join Date: Mar 2000
Location: Here.
Posts: 315
Steve you are right on the money!
The cable is not broken anywhere, it is spinning but it is not reaching into the speedometer. Looks like the housing is overstreched. I bought the new cable already, however I will follow your advice and connect it at the cluster end first.
Thank you very much for your input.


Reply With Quote


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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Why are Mercedes part numbers so hard to find? JamesStein Diesel Discussion 13 01-05-2005 03:07 PM
*CLEAN* W124 Gray MB-Tex Front Seats / 300E 260D 300D (300E 2.8) and (W124 Wagons) FA22 Mercedes-Benz Used Parts For Sale & Wanted 5 03-01-2004 08:40 PM
300E OVP question jimmyny Tech Help 2 10-05-2002 05:49 PM
300E Fail-Start Part Deux Ammadeus Tech Help 5 06-11-1999 04:34 PM
300E Idle Speed E. Lee Tech Help 3 06-03-1999 09:59 PM

All times are GMT -4. The time now is 08:19 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2021, 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