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

LinkBack Thread Tools Display Modes
Old 11-02-2021, 09:49 AM
Registered User
Join Date: Jul 2021
Posts: 6
85 300SD Firewall Throttle Linkage 85 300SD Firewall Throttle Linkage

Hi everyone, thanks to the comments on my last post and some digging through various forums, I've solved my low power issue on my 85 300SD. It's now making good power but I have a very minor issue to solve. When I push the pedal all the way down, my throttle linkage still has about a quarter of an inch of travel left. I'm assuming this is down to an issue with the linkage attached to the firewall, I've adjusted the linkages on the valve cover so that I can actuate it through its full travel with no binding or play. I tried unscrewing the ball socket at the end of the linkage that comes up from the bottom of the firewall but it unthreads completely before raising up the socket enough to fully push the ball it's attached to. I've attached a picture of roughly the amount of travel I have, and I can take some more pictures tomorrow.

Last edited by Linakesh; 11-03-2021 at 01:03 PM.
Reply With Quote
Old 11-02-2021, 10:54 AM
Registered User
Join Date: Jan 2006
Location: Tucson, AZ
Posts: 5,358
What is the condition of your engine mounts? A collapsed mount on the LH side will allow the engine to drop/sag and creates a longer throw for the linkage.
“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now
Reply With Quote
Old 11-03-2021, 01:15 AM
Rogviler's Avatar
Join Date: Apr 2011
Location: Colorado
Posts: 902
Oh man, those stupid overly-complicated linkages can be a pain. I chased mine all over the place for years and finally figured out by accident that someone previously had put the linkage that goes around the sway bar on backwards. Now, one of these days, I'm going to have to go over the whole thing again and hopefully get it working right finally.

Lots of things can affect them, and you may find that setting everything to the "FSM measurements" doesn't work either because of wear throwing it off.

You just have to take each piece one at a time. And yes, definitely check seemingly unrelated things like the engine mounts. There's also the firewall pivot to look at, and the pedal itself, which can get wonky.

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

All times are GMT -4. The time now is 06:48 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2023, 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