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 > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 05-20-2019, 01:29 AM
Registered User
 
Join Date: Oct 2017
Posts: 50
w123 steering box issue

The power steering box on my 85 300d was leaking from the input seal. To make things easy, I just swapped in the box from my 83 300d parts car. The box didn't appear to have any leaks and did not have any slop. Once installed, it steers too easy to the left and not easy enough to the right. Comparing to the old box I'd say 50% easier steering left and 50% harder to the right. It steers way too easy to the left and just slightly easier than manual steering to the right. this is not just from center either, steer all the way to the left easy and as soon as you start turning right it's harder and vice versa.


Any idea what would cause this? Worse case scenario I'll just reseal my old box but would like to fix this one if possible.
__________________
1985 Mercedes 300D bought for $400 work in progress. Video Playlist: https://www.youtube.com/playlist?list=PLeYmvdiw3Xm87mFck3FjQ12ZoTSFXZ0Rr
Reply With Quote
  #2  
Old 05-20-2019, 04:07 AM
Stretch's Avatar
...like a shield of steel
 
Join Date: Sep 2009
Location: Somewhere in the Netherlands
Posts: 14,453
Quote:
Originally Posted by michael0584 View Post
The power steering box on my 85 300d was leaking from the input seal. To make things easy, I just swapped in the box from my 83 300d parts car. The box didn't appear to have any leaks and did not have any slop. Once installed, it steers too easy to the left and not easy enough to the right. Comparing to the old box I'd say 50% easier steering left and 50% harder to the right. It steers way too easy to the left and just slightly easier than manual steering to the right. this is not just from center either, steer all the way to the left easy and as soon as you start turning right it's harder and vice versa.


Any idea what would cause this? Worse case scenario I'll just reseal my old box but would like to fix this one if possible.
Three possible problems that I can think of


1) There's something wrong with the rest of the steering system - steering dampers for example can cause some weird **** - probably not the case if it was all working well before but I thought I'd mention it


2) Pitman arm - check to make sure the same P/N - ID on the new steering box is the same as the old one. There are subtle differences - all explained (ad nauseam) in the FSM


3) Shuttle valve got a bit of crud in it


I did a bit of a big DIY a few years back on the steering box here =>


What a feeling it will be! A properly adjusted W123 / W116 / W126 power steering box


If you have the time to read it there's probably more than enough information in that thread for you...
__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
Reply With Quote
  #3  
Old 05-20-2019, 06:56 AM
A guy who likes to Benz
 
Join Date: May 2010
Location: DC Metro/Maryland
Posts: 5,719
Quote:
Originally Posted by michael0584 View Post
The power steering box on my 85 300d was leaking from the input seal. To make things easy, I just swapped in the box from my 83 300d parts car. The box didn't appear to have any leaks and did not have any slop. Once installed, it steers too easy to the left and not easy enough to the right. Comparing to the old box I'd say 50% easier steering left and 50% harder to the right. It steers way too easy to the left and just slightly easier than manual steering to the right. this is not just from center either, steer all the way to the left easy and as soon as you start turning right it's harder and vice versa.


Any idea what would cause this? Worse case scenario I'll just reseal my old box but would like to fix this one if possible.
The o-ring on the end of the pitman shaft is leaking badly. It's not allowing part of the box to pressurize and essentially reducing the power assist when turning right.

You need both boxes rebuilt. One due to the external leak, the other due to the internal leak.
__________________
I recondition w123/w126/w124/w140/r107/r129/ steering boxes!


1984 300D "Elsa" odo reset 6/2011 111k
1983 300TD "Mitzi" ~268k OM603 powered
1995 E300 "Adelheid" 262k [Sold]
Reply With Quote
  #4  
Old 06-04-2019, 11:11 AM
Registered User
 
Join Date: Oct 2017
Posts: 50
Thanks guys, I ended up ordering a seal kit and have resealed my original box. Now I just need to swap it back in. I may open up the other box at some point and see if I can see the issue.
__________________
1985 Mercedes 300D bought for $400 work in progress. Video Playlist: https://www.youtube.com/playlist?list=PLeYmvdiw3Xm87mFck3FjQ12ZoTSFXZ0Rr
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 09:51 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, 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