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 09-12-2013, 09:38 PM
Registered User
 
Join Date: May 2013
Posts: 36
Odd front end knock

I know my guide rod bushings are shot and need replacement, I have them in the trunk... lol This obvious while driving slowly over bumps on the road however I have a single loud knock heard inside cabinet when decelerating and occasionally while shifting from 3rd to 4th gear. The noise is more pronounced around town when my speed just barely warrants 4th gear, transmission shifts I decelerate and I hear the single knock. Vacuum seems good, recently bypassed EGR with Kit from forum member and transmission is smooth with this exception. Could this be the guide rods i'm hearing? Could it be the sign of a failing transmission? Engine or motor mounts? Any obvious things for me to check right away?

Thanks,

__________________
1987 300SDL 257K
Reply With Quote
  #2  
Old 09-12-2013, 10:04 PM
Registered User
 
Join Date: Oct 2007
Location: Greater Metropolitan Beaverdam VA
Posts: 2,876
May not be

suspension related. Check air cleaner rubber shock mounts.
Reply With Quote
  #3  
Old 09-13-2013, 12:44 AM
Registered User
 
Join Date: May 2013
Posts: 36
So are you saying its not the guide rods making the noise?
__________________
1987 300SDL 257K
Reply With Quote
  #4  
Old 09-13-2013, 06:40 AM
Registered User
 
Join Date: Oct 2007
Location: Greater Metropolitan Beaverdam VA
Posts: 2,876
Our old cars

have many components that can produce noises. Most of the clunks and knocks that are not engine-related are produced by worn rubber components in suspension, engine/transmission mounts and other shockmounts. In my case, the only item clunkiing under my hood was the air cleaner. I only mentioned it because it is so easy to check and repair.
Reply With Quote
  #5  
Old 09-13-2013, 10:43 AM
Registered User
 
Join Date: Jun 2004
Location: West of Ft. Worth. TX
Posts: 4,186
It could still be the guide rods making the noise but it would be "noticed" around your feet, where they are located. Depending on how long the guide rod mounts have been severely worn, you may have other suspension parts starting to exhibit wear. This other single knock, what area of the car does it seem to eminate from?
__________________
Sam

84 300SD 350K+ miles ( Blue Belle )
Reply With Quote
  #6  
Old 09-14-2013, 05:09 PM
Registered User
 
Join Date: May 2013
Posts: 36
It happens when shifting from 3rd to 4th, sounds like its coming from the lower sode of the engine compartment, almost like it could be transmission flexing somehow not sure if that's possible. Checked the airbox rubbers and they are good.

__________________
1987 300SDL 257K
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 01:51 PM.


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