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

Reply
 
LinkBack Thread Tools Display Modes
  #16  
Old 03-22-2009, 08:28 AM
Registered User
 
Join Date: Jan 2002
Location: England
Posts: 1,841
A manual ASD install would be possible for someone experienced and knowledgeable but not an easy job. I know in the factory installation it is powered through the OVP (asd cars tend to have a different ovp relay); also there is a switch on the brake pedal which activated and presumably cuts out the ASD operation for some reason.

Have a look a the video I posted on the first page to see it in action. You don't strongly notice it activating. The only time I notice it is if it's wet and I pull away at speed inducing wheelspin. When you hit a certain speed (19mph by the looks of things) the acceleration occuring can reduce - this is I presume due to the ASD cutting out and me being left with less rear lock up and less traction.

In the dry, in bends, and making a tight turn while pulling away, I don't notice it operating, so either it's quite subtle, or the existing LSD effect is making a good difference already, or my clutch packs are worn out.

Incidentally my ASD diff has slack in it and makes the drivetrain clonky; is it rebuildable and could I do it myself?
__________________
190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg
Reply With Quote
  #17  
Old 03-23-2009, 12:08 PM
babymog's Avatar
Loose Cannon - No Balls
 
Join Date: Jan 2006
Location: Northeast Indiana
Posts: 10,767
In LSD work I've done, I was able to specify how much lockup (what %) I wanted, I've gone up to 60% for some racing applications.

Dave or others might know if the parts are available to create a tighter rear diff for these cars also, I'm guessing yes. Looser also.

Quote:
Originally Posted by Bio300TDTdriver View Post
YIKES! That sure doesn't sound easy. So if I just switch to the LSD and not all the electronics, it would give me 35% lock up, if I rebuilt the clutch packs, is that correct? Would I still need to hook up the hydraulics?

Does my wagon and the 90-93 sedans have the same rear differential?
__________________

Gone to the dark side

- Jeff
Reply With Quote
  #18  
Old 03-23-2009, 06:24 PM
gsxr's Avatar
Unbanned...?
 
Join Date: Aug 2001
Location: USA
Posts: 8,002
Quote:
Originally Posted by pentoman View Post
In the dry, in bends, and making a tight turn while pulling away, I don't notice it operating, so either it's quite subtle, or the existing LSD effect is making a good difference already, or my clutch packs are worn out.

Incidentally my ASD diff has slack in it and makes the drivetrain clonky; is it rebuildable and could I do it myself?
The clutch pack is rebuildable, and is an "advanced" DIY if you're willing to tackle the job. If the diff itself is worn (bad bearings, or gears, etc)... forget it, much easier (and cheaper) to replace with a good used diff.
Reply With Quote
  #19  
Old 03-23-2009, 06:28 PM
gsxr's Avatar
Unbanned...?
 
Join Date: Aug 2001
Location: USA
Posts: 8,002
Quote:
Originally Posted by babymog View Post
In LSD work I've done, I was able to specify how much lockup (what %) I wanted, I've gone up to 60% for some racing applications.

Dave or others might know if the parts are available to create a tighter rear diff for these cars also, I'm guessing yes. Looser also.
Nope, not with the Mercedes design. If you try to make the clutch pack tighter, you cannot assemble the diff (the spider gears will not rotate into position). BT, DT. When set to spec, it immediately (within 100-200 miles of driving) wears enough to allow turning left vs. right sides by hand. It only offers the ~35% lock when under load (torque applied from engine to the wheels), this puts presure on the clutches and causes them to engage.

You can add a spring block, which adds pressure to the clutch pack at all times. This basically simulates ASD engagement at all times. You adjust the "percent" lockup by stronger or weaker springs. The only drawback is that you cannot use circlips to hold the axle flanges in place, they will float in & out. The folks who have done this (usualy the 190E-16 crowd) say it works ok though. For street use, I have not found it necessary to do this. I'm sure on the racetrack (road course or autox, not dragstrip!) it's a bigger deal.


Reply With Quote
  #20  
Old 03-27-2009, 08:12 AM
Registered User
 
Join Date: Jan 2002
Location: England
Posts: 1,841
Quote:
Originally Posted by gsxr View Post
The clutch pack is rebuildable, and is an "advanced" DIY if you're willing to tackle the job. If the diff itself is worn (bad bearings, or gears, etc)... forget it, much easier (and cheaper) to replace with a good used diff.
Let's hear more about the rebuild.....
Can it cure looseness in the diff? Cure jerking at low speed and changing gear?
__________________
190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg
Reply With Quote
  #21  
Old 03-27-2009, 11:33 AM
gsxr's Avatar
Unbanned...?
 
Join Date: Aug 2001
Location: USA
Posts: 8,002
Quote:
Originally Posted by pentoman View Post
Let's hear more about the rebuild.....
Can it cure looseness in the diff? Cure jerking at low speed and changing gear?
The rebuild is pretty straightforward, and covered in the factory service manual (the W126 manual has really good photos of the procedure). If the diff is "loose" as in sloppy, meaning excess gear backlash, or bearing movement... that's when you replace the entire diff with a good used unit. The clutch pack rebuild ONLY will improve the limited-slip action. When the clutch pack is worn out, the diff acts like a plain open diff. Rebuilding the clutch pack restores the limited-slip functionality only.

Jerking at low speed and/or when changing gears sounds like a tranny issue, or flex disc problem, and if it is the diff... again, that sounds like a worn-out differential. A tired LSD clutch pack would not cause any of that behavior, it simply wouldn't provide any connection between left & right wheels.

Reply With Quote
  #22  
Old 03-29-2009, 01:53 PM
Registered User
 
Join Date: Jan 2002
Location: England
Posts: 1,841
Quote:
Originally Posted by gsxr View Post
The rebuild is pretty straightforward, and covered in the factory service manual (the W126 manual has really good photos of the procedure). If the diff is "loose" as in sloppy, meaning excess gear backlash, or bearing movement... that's when you replace the entire diff with a good used unit. The clutch pack rebuild ONLY will improve the limited-slip action. When the clutch pack is worn out, the diff acts like a plain open diff. Rebuilding the clutch pack restores the limited-slip functionality only.

Jerking at low speed and/or when changing gears sounds like a tranny issue, or flex disc problem, and if it is the diff... again, that sounds like a worn-out differential. A tired LSD clutch pack would not cause any of that behavior, it simply wouldn't provide any connection between left & right wheels.

Okay... well that's what I have, a jerking. Flex discs are (were) new and gearbox was rebuilt so I presume is fine, which brings me to the diff. You can't rebuild the part of the diff that makes it jerky then? Replace the worn gears or something??
__________________
190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg
Reply With Quote
  #23  
Old 03-29-2009, 02:14 PM
babymog's Avatar
Loose Cannon - No Balls
 
Join Date: Jan 2006
Location: Northeast Indiana
Posts: 10,767
Change the fluid, be sure you have the correct fluid for LSD.
__________________

Gone to the dark side

- Jeff
Reply With Quote
  #24  
Old 03-29-2009, 05:57 PM
Registered User
 
Join Date: Jan 2002
Location: England
Posts: 1,841
Really? Fluid??
__________________
190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg
Reply With Quote
  #25  
Old 03-29-2009, 06:01 PM
Unofficial wormcan opener
 
Join Date: Dec 2005
Location: Ashland, MA
Posts: 2,602
Quote:
Originally Posted by pentoman View Post
Really? Fluid??
Why not? It's an inexpensive place to start.
__________________
1987 300TD 309, xxx 2.8.2014 10,000 mile OCI


Be careful of the toes you step on today, as they may be connected to the ass you have to kiss tomorrow. anonymous

“Be who you are and say what you feel, because those who mind don’t matter, and those who matter won’t mind.” Dr. Seuss
Reply With Quote
  #26  
Old 03-29-2009, 07:18 PM
babymog's Avatar
Loose Cannon - No Balls
 
Join Date: Jan 2006
Location: Northeast Indiana
Posts: 10,767
^^ my opinion also.

LSD doesn't work properly with additives and such, if you don't know what's in there, it's a good place to start IMO.
__________________

Gone to the dark side

- Jeff
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 02:51 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