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 01-26-2008, 03:14 PM
biobenz617's Avatar
Registered User
 
Join Date: Jan 2006
Location: Denver, CO
Posts: 180
Power Steering Strength Adjustment

I have two W123 300D turbos and they both have very different steering characteristics. One, 1984, has a heavy wheel with a little free play where the other one, 1983, is really easy to turn and also has too much free play. They both have good steering dampers because I've replaced both in the last couple thousand miles.

Is there a way to adjust the power steering assist on these cars? I don't like the '83 because it is sloppy and too easy to turn the wheel. I need to adjust the play on the box, but would that also tone down the assist strength?

Thanks,

__________________
Dave

2002 Audi S6 Avant
1983 300D
1984 300D (sold)
1990 560SEL (sold)
Reply With Quote
  #2  
Old 01-26-2008, 03:58 PM
Registered User
 
Join Date: Sep 2004
Posts: 8,731
There is an adjustment screw (with locknut) on the top of the gear box. CW loosens, CCW tightens.
Reply With Quote
  #3  
Old 01-26-2008, 04:00 PM
TheDon's Avatar
Ghost of Diesels Past
 
Join Date: Oct 2005
Posts: 13,217
adjusting requires two people.. you.. and a helper
Reply With Quote
  #4  
Old 01-26-2008, 06:15 PM
ForcedInduction
Guest
 
Posts: n/a
Adjusting slack is one thing, power assist is not adjustable.
Reply With Quote
  #5  
Old 01-26-2008, 06:48 PM
Registered User
 
Join Date: Sep 2004
Posts: 8,731
Quote:
Originally Posted by ForcedInduction View Post
Adjusting slack is one thing, power assist is not adjustable.
That's absolutely correct. You are actually changing the power required, not the power available.
Reply With Quote
  #6  
Old 01-26-2008, 09:02 PM
Palangi's Avatar
L' Résistance
 
Join Date: Dec 2000
Location: Republique de Banana
Posts: 3,496
I don't know the reason, but there is a big difference between my two 84's. Steering on the 300D is a bit heavier than what I would consider ideal. Steering on the 240D is very light, much more pleasant to steer.
__________________
Palangi

2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg



TRUMP .......... WHITEHOUSE
HILLARY .........JAILHOUSE
BERNIE .......... NUTHOUSE
0BAMA .......... OUTHOUSE
Reply With Quote
  #7  
Old 01-26-2008, 09:35 PM
ForcedInduction
Guest
 
Posts: n/a
Quote:
Originally Posted by Palangi View Post
I don't know the reason, but there is a big difference between my two 84's. Steering on the 300D is a bit heavier than what I would consider ideal. Steering on the 240D is very light, much more pleasant to steer.
Probably the 100lbs difference over the front end.
Reply With Quote
  #8  
Old 01-26-2008, 09:35 PM
Ara T.'s Avatar
Registered User
 
Join Date: Sep 2004
Location: Santa Rosa, CA
Posts: 2,075
Might be a difference in caster as well but I don't know if a couple of degrees difference would be a dramatic change in steering effort.
__________________
1985 CA 300D Turbo , 213K mi
Reply With Quote
  #9  
Old 01-26-2008, 09:40 PM
Palangi's Avatar
L' Résistance
 
Join Date: Dec 2000
Location: Republique de Banana
Posts: 3,496
Quote:
Originally Posted by ForcedInduction View Post
Probably the 100lbs difference over the front end.
There is quite a noticable difference. I don't think 100 pounds would account for it.
__________________
Palangi

2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg



TRUMP .......... WHITEHOUSE
HILLARY .........JAILHOUSE
BERNIE .......... NUTHOUSE
0BAMA .......... OUTHOUSE
Reply With Quote
  #10  
Old 01-26-2008, 09:44 PM
Palangi's Avatar
L' Résistance
 
Join Date: Dec 2000
Location: Republique de Banana
Posts: 3,496
Quote:
Originally Posted by Ara T. View Post
Might be a difference in caster as well but I don't know if a couple of degrees difference would be a dramatic change in steering effort.
There may be some alignment issues with the 240D. The 300D was aligned a while back, and the alignment seems good. No unusual tire wear or anything. The 240D front end is close to needing a rebuild, although the steering play is practically zero.
__________________
Palangi

2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg



TRUMP .......... WHITEHOUSE
HILLARY .........JAILHOUSE
BERNIE .......... NUTHOUSE
0BAMA .......... OUTHOUSE
Reply With Quote
  #11  
Old 01-26-2008, 09:46 PM
Craig
Guest
 
Posts: n/a
I have noticed that tire size, tire pressure, and alignment do make a noticeable difference in feel. My 240D (with 175 tires) does feel "lighter" than my 300D with 205 tires.
Reply With Quote
  #12  
Old 01-26-2008, 09:54 PM
Palangi's Avatar
L' Résistance
 
Join Date: Dec 2000
Location: Republique de Banana
Posts: 3,496
Quote:
Originally Posted by Craig View Post
I have noticed that tire size, tire pressure, and alignment do make a noticeable difference in feel. My 240D (with 175 tires) does feel "lighter" than my 300D with 205 tires.
Same Michelins at the same pressure on both cars. But I know what you mean though. The previous tires on the 300D were Bridgestones, and they had a heavier feel, as if the pressure was low.
__________________
Palangi

2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg



TRUMP .......... WHITEHOUSE
HILLARY .........JAILHOUSE
BERNIE .......... NUTHOUSE
0BAMA .......... OUTHOUSE
Reply With Quote
  #13  
Old 01-26-2008, 10:27 PM
PaulH's Avatar
Registered User
 
Join Date: Dec 2002
Location: Annapolis,Md
Posts: 442
Tire difference.

When I switched from Dunlops to Michelins, the SDL became a lot easier to turn. It was like the front end was lighter. And, I had 33 lbs in both sets of tires.
__________________
Paul 1987 300 SDL; 2000 ML; '69 MGB; '68 VW Fastback
Reply With Quote
  #14  
Old 01-29-2008, 07:00 PM
biobenz617's Avatar
Registered User
 
Join Date: Jan 2006
Location: Denver, CO
Posts: 180
I had an indie shop do the alignments on both cars within the last year. I should go through the records and see if he changed the caster.

Is there constant pressure in the power steering supply line from the pump, or does the pressure vary with an increase when the wheel is turned and the box requires power?

__________________
Dave

2002 Audi S6 Avant
1983 300D
1984 300D (sold)
1990 560SEL (sold)
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 12:37 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, 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