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 > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 03-20-2002, 02:24 AM
MikeTangas's Avatar
Senior Member
 
Join Date: Apr 2000
Location: So. Cal
Posts: 4,430
Adjusted throttle control rods to spec, shift quality diminished

Now that the major work is done on the 560 I started finishing off the small stuff. I started by thouroughly cleaning and lubing the throttle linkage. Then I checked the rod lengths against the book and found all to be shorter than book, except for the long rod to the relay lever (it was too long). The worst was the connecting link from the accelerator control shaft to the fulcrum lever (the spring loaded rod).

Most of the rods were only short by a mm or two, but the rod to the fulcrum lever was a good 10-12mm short. After adjusting to proper length throttle response was great. A lot of improvement could also be due to the clean/lube job though. During the test drive I noticed the silk smooth shifts were gone. The tranny slammed into gear at each shift, even worse under hard acceleration. Returned home double checked lengths and studied the situation.

I took a gamble and started shortening the rod to the fulcrum lever back toward where it was, and as I shortened it the shifts became smoother. I still have a little slam under hard acceleration, but it is smooth enough to hold out till the weekend.

I decided that adjusting this connecting link somehow changed the relationship of the fulcrum lever to bowden cable for the tranny. Just how I'm not sure yet. If I set the rod to length I assume I will then have to adjust the bowden cable to smooth the shifts, or I could just leave the connecting rod short.

I also wonder if the PO's mechanic might have dinked with the connecting link to compensate for a misadjusted modulator. Opinions anyone, am I on the right track or am I upsetting the apple cart?
__________________
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.
Reply With Quote
  #2  
Old 03-20-2002, 08:39 AM
Registered User
 
Join Date: Dec 2001
Location: LaPorte, IN
Posts: 400
Mike,
I adjusted mine to spec recently. The rod to the fulcrum was the only one that was right length, but when I lenghtened the rods to the throttle body and cruise control actuator(?) the fulcrum closed and so I had to shorten the slide adjustor to the Bowden cable to compensate. Result was the shift timing was later, which felt mor correct and got closer to spec, but shifts became sloppier-especially the 2-3 which now flares a lot. I'm waiting for a pressure guage I ordered last week to check the modulator pressure before I make any other changes.

No expert here, but checking the modulator pressure seems like a logical step. If you sort yours out before I get mine dialed in, I'd appreciate knowing the lengths you end up at.
__________________
Earl McLain
'02 C230 Kompressor
'89 560 SEL "Frau BlueCar" (retired April 2004)
Reply With Quote
  #3  
Old 03-20-2002, 10:54 PM
MikeTangas's Avatar
Senior Member
 
Join Date: Apr 2000
Location: So. Cal
Posts: 4,430
Vacuum line to the modulator is intact. I did replace the rubber connector today, just because it was a little hardened.

I studied on the bowden cable today. I cannot see where the adjustment is made (but then again I didn't pull the air filter housing either). Once all the rods are set to length, be it to a set measurement or a "without tension" adjustment, then the adjustment is made to the bowden cable as a last step.

Proper procedure is to move the relay lever (that the bowden cable is attached to) toward the passenger fender (if LHD) until it touches the idle stop of the transmission. Attach the connecting link free of tension; adjust if necessary.

As I read/wrote the above paragraph, it dawned on me that the connecting link had a slide adjustment and a set screw. They way I am reading this is once everything is adjusted (throttle rods), the connecting link (#22) is not connected to the relay lever (#23), the lever is moved gently to the right until it touches the stop, then #22 is attached. If anything has to be moved to make the attachment then the length of #22 is adjusted so the end fits on the ball stud without tension and the bowden cable is now adjusted.

I'll try making this adjustment perhaps on Sunday. No car work Saturday - it's the first pistol match of the year and I haven't practiced at all - been too busy repairing a car . After that I'll study up on the modulator itself.

Again, this procedure is listed for the 126, may not apply to other models.
__________________
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.

Last edited by whunter; 03-21-2009 at 03:32 AM. Reason: spelling
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Engine light DTC codes? 1994 S600 Coupe 600sleeper Tech Help 3 02-24-2003 06:28 PM
82 300SD throttle linkage and cruise control waybomb Diesel Discussion 0 12-28-2002 06:52 PM
84 300TD varying shift quality jas2wa Diesel Discussion 1 12-02-2002 07:08 PM
1997 E420 Transmission Shift Quality Deterioration jgl1 Tech Help 1 06-23-2002 11:56 PM
Transmission Shift Quality? Channel1 Vintage Mercedes 0 04-03-2001 12:03 PM



All times are GMT -4. The time now is 12:51 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page