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 10-24-2017, 10:14 PM
Registered User
 
Join Date: Oct 2017
Location: Tejas
Posts: 58
Exclamation Serious Clunking from Front-End W126

Ive been driving my project to and from work but today when I was just about home I began to experience a major repetitive clunking when applying the brakes. It was severe enough I opted to use the parking brake until reaching my destination. Here are the facts:

  • This 1986 300sdl wasn't driven for a few years before being driven daily.
  • All brakes needed work. front calipers were rebuilt w/ new pads and the rear has yet to be serviced w/ new pads (arrived today in mail).
  • After priming this diesel, I opted to drive it to and from work as I reconditioned the interior to my standards. Since beginning to drive this mothership, the shocks have slowly worn down to what Id label as ****. New parts arrive in mail in a few days.
  • The clunking is very severe unlike any broken ball joints I have heard on my truck, etc. Location: Front Right
  • No clunking or braking discrepancies in reverse .
  • After finally stopping( very hard,sudden stop) via the clunking, when I begin on the accelerator pedal I reach around 2k RPM before a loud clunk, after this "release" I am completely mobile w/o any obvious problems such as shifting, etc.
After some research I have considered replacing the Guide-Rod assembly on both ends but am eager for more educated feedback. Physical inspection didn't show any immediate signs of damage or rotten bushings of immediate repair.

This is urgent because I use this car to get to my parent in which I provide care for, as well as needing the fuel saving goddess for a 5 hr road trip I have to make this weekend.

Best,
S-Klasse Cowboy

__________________
-“Never trust a mechanic who drives new cars. They're either charging too much money for their work, or they can't keep an old car running - maybe both.”
Reply With Quote
  #2  
Old 10-24-2017, 10:16 PM
Registered User
 
Join Date: Oct 2017
Location: Tejas
Posts: 58
PS This is my first Post!

I am expecting great things from this community in a mutual relationship to be
__________________
-“Never trust a mechanic who drives new cars. They're either charging too much money for their work, or they can't keep an old car running - maybe both.”
Reply With Quote
  #3  
Old 10-24-2017, 10:49 PM
Rogviler's Avatar
Unpurist
 
Join Date: Apr 2011
Location: Colorado
Posts: 904
I would first check for a loose bolt on the front brakes. It's happened to the best of us, which is why I always use thread locker now. I've only had a bolt come loose and go pinking away under the car (amazingly I hiked back up the road and found it), but a buddy of mine had the whole caliper come off.

Another thing would be the guide rod mount, which is basically what braces the wheel while the brakes are being applied.
Reply With Quote
  #4  
Old 10-24-2017, 10:55 PM
Registered User
 
Join Date: Oct 2017
Location: Tejas
Posts: 58
Quote:
Originally Posted by Rogviler View Post
Another thing would be the guide rod mount, which is basically what braces the wheel while the brakes are being applied.
If the guide rod mount was at fault, do you think my issue would be present any any given speed? I did notice some pitting in the rubber at the mount during visual inspection.
I didnt use threadlock on the caliper bolts but I know its necessary. Will check them with tools but they feel very secure.
__________________
-“Never trust a mechanic who drives new cars. They're either charging too much money for their work, or they can't keep an old car running - maybe both.”
Reply With Quote
  #5  
Old 10-24-2017, 11:38 PM
Registered User
 
Join Date: Sep 2004
Posts: 8,971
Quote:
Originally Posted by S-Klasse_Cowboy View Post
The clunking is very severe unlike any broken ball joints I have heard on my truck, etc. Location: Front Right
I would not rule out a worn ball joint. You can confirm by placing a jack or jack stand under the lower control arm with the tire a couple inches off the ground. Place a long pry bar under the tire and lift. If there is play in the lower ball joint, you will feel and hear it.
__________________
When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl.
Reply With Quote
  #6  
Old 10-25-2017, 03:25 AM
cho's Avatar
cho cho is offline
diesel power
 
Join Date: Dec 2011
Location: Europe
Posts: 934
mount perhaps

how about a engine mount ... I had issue several yrs ago with
loosen side bolts on mounts,manifested as clunk in that area
when brakes applied or even in place (high rpm / low rpm).

these are easy to inspect,warm engine,lift the bonnet and dance
the pedal up and down so you can see movement of the whole engine
in my case jump was observed from left to right.

cheers
ChO
__________________
w126 500SEC gen II euro, powered by OM617 turbo stolen from 84 300SD 2.88 diff,EGR blinded
next wish/project: w114 coupe OM603 powered
Reply With Quote
  #7  
Old 10-26-2017, 08:23 PM
Registered User
 
Join Date: Oct 2017
Location: Tejas
Posts: 58
Quote:
Originally Posted by Rogviler View Post
I would first check for a loose bolt on the front brakes. It's happened to the best of us, which is why I always use thread locker now. I've only had a bolt come loose and go pinking away under the car (amazingly I hiked back up the road and found it), but a buddy of mine had the whole caliper come off.

Another thing would be the guide rod mount, which is basically what braces the wheel while the brakes are being applied.

Rogviler, you nailed it. I AM missing a caliper bolt but in either cause of effect, the guide rod mount is shot to ****. Repairs being made now.

Peace.
__________________
-“Never trust a mechanic who drives new cars. They're either charging too much money for their work, or they can't keep an old car running - maybe both.”
Reply With Quote
  #8  
Old 10-26-2017, 09:40 PM
Registered User
 
Join Date: Sep 2006
Location: Middle TN
Posts: 4,154
You'll be happier after you do all of the rubber in the front end. It will drive like a Mercedes is intended.
__________________
85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.
Reply With Quote
  #9  
Old 10-30-2017, 08:28 PM
Registered User
 
Join Date: Oct 2017
Location: Tejas
Posts: 58
Quote:
Originally Posted by Junkman View Post
You'll be happier after you do all of the rubber in the front end. It will drive like a Mercedes is intended.
Commencing Front-End rebuild after I replace rear shocks!
Very very excited
__________________
-“Never trust a mechanic who drives new cars. They're either charging too much money for their work, or they can't keep an old car running - maybe both.”
Reply With Quote
  #10  
Old 10-30-2017, 08:34 PM
tyl604's Avatar
Registered User
 
Join Date: Feb 2008
Location: Atlanta, GA
Posts: 3,633
How about a couple of pictures?
Reply With Quote
  #11  
Old 10-30-2017, 09:49 PM
Rogviler's Avatar
Unpurist
 
Join Date: Apr 2011
Location: Colorado
Posts: 904
Quote:
Originally Posted by tyl604 View Post
How about a couple of pictures?
Yes, be sure to get the vacant bolt hole from ALL angles so we can over-analyze it for nine pages.

Glad you got it figured out and that it was something obvious.

-Rog
Reply With Quote
  #12  
Old 10-31-2017, 08:26 PM
Registered User
 
Join Date: Oct 2017
Location: Tejas
Posts: 58
Quote:
Originally Posted by Junkman View Post
You'll be happier after you do all of the rubber in the front end. It will drive like a Mercedes is intended.
This line makes me miss my w116.
Just putting it out there, her name was Citrus Clitoris.
RIP
__________________
-“Never trust a mechanic who drives new cars. They're either charging too much money for their work, or they can't keep an old car running - maybe both.”
Reply With Quote
  #13  
Old 10-31-2017, 08:31 PM
Registered User
 
Join Date: Oct 2017
Location: Tejas
Posts: 58
Quote:
Originally Posted by tyl604 View Post
How about a couple of pictures?
http://www.***************/secure/PartImages/1234210171.jpg

LOL
Just pullin' your pubes, partner. I will update some photos of my cavalry past and present on the forums sooner than later.
__________________
-“Never trust a mechanic who drives new cars. They're either charging too much money for their work, or they can't keep an old car running - maybe both.”
Reply With Quote
  #14  
Old 10-31-2017, 09:47 PM
Registered User
 
Join Date: Sep 2006
Location: Middle TN
Posts: 4,154
Bilstein HD for shocks.
__________________
85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.
Reply With Quote
  #15  
Old 10-31-2017, 10:29 PM
Shadetree
 
Join Date: Jan 2010
Location: Back in SC upstate
Posts: 1,838
Well, that's what we do.

Quote:
Originally Posted by Rogviler View Post
Yes, be sure to get the vacant bolt hole from ALL angles so we can over-analyze it for nine pages.

Glad you got it figured out and that it was something obvious.

-Rog
I kinda enjoy reading those volumes of analysis which are created while discussing a missing grommet or a loose screw.

__________________
84 300SD
85 380SE
83 528e
95 318ic
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 07:37 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, 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