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 08-18-2002, 04:05 AM
simon288
Guest
 
Posts: n/a
Clunking noise in 300D

Hi All,

I have a clunking noise in my 300D. Judging by ear, the noise seems to originate from between the suspension area to just below the driver floorboard.

The noise generally comes up when I hit bumps in the road, turn left to right, or vice-versa while driving. The noise comes up EVERY time I shut off the ignition.

I have already brought the car to two independent MBZ shops and one suggested I replace the left ball joint which I did, but the clunking noise remained. The other mechanic could not figure out what causes the noise.

So, I decided to post this question to you all to get your feedback as to what is causing this annoying clunking noise.

Any and all help will be greatly appreciated.

Simon

Reply With Quote
  #2  
Old 08-18-2002, 04:59 AM
The Warden's Avatar
Certified diesel nut
 
Join Date: Mar 2002
Location: Pacifica (SF Bay Area), CA
Posts: 2,946
Lightbulb

Cool, another Peninsula type.

You may take a look at the front sway bar. If the noise comes up every time you kill the engine, you may also want to take a look at the engine mounts and the tranny mounts.

Except for the noise appearing every time you kill the engine, it sounds a lot like a problem I had with a '65 Chevelle a while back; one of the bolts holding the front sway bar to the wheel suspension assembly had broken clean off. Combined with bad springs and bad shocks, the car handled horribly in turns...

Hope that helps a little. Good luck!
__________________
2001 VW Jetta TDI, 5 speed, daily driver
1991 Ford F-350, work in progress
1984 Ford F-250 4x4, 6.9l turbo diesel, 5 speed manual
Previous oilburners: 1980 IH Scout, 1984 E-350, 1985 M-B 300D, 1979 M-B 300SD, 1983 M-B 300D
Spark-free since 1999
Reply With Quote
  #3  
Old 08-18-2002, 09:30 AM
Registered Diesel Burner
 
Join Date: Aug 2001
Location: Northern Virginia
Posts: 2,911
If it happens every time you cut the motor off, that helps you in finding the problem if you can get outside the car and have someone else turn the engine off. There are a lot of rubber bushings in the front suspension of these cars - control arms, etc. Hopefully you can first determine which side it is on, and then start shaking things by hand and doing a visual inspection.

With regard to motor/transmission mounts, there are two rubber blocks on each side of the engine, and one rubber block at the back of the transmission. If you're leaking motor oil or transmission fluid it shortens the life of these rubber blocks.

I don't think a bad ball joint will creak/croak when you turn off the engine. Open the hood and watch/listen on each side of the engine. Also consider that a broken air cleaner mount will let the cleaner housing bump against things and make some unbelievably loud noises.

This is something you can find with time invested to track it down - better than a mechanic that spends five minutes and then starts advising you on things that "need" replacing.

Ken300D
Reply With Quote
  #4  
Old 08-18-2002, 09:58 AM
MVK MVK is offline
Registered User
 
Join Date: May 2002
Location: Queens, NY
Posts: 447
Check the engine mounts and engine shock. Also check for any other metal pipes that might have come loose off of its clamps. eg. AC compressor lines etc. Check the mounting bolts on each of the external componenets like steering pump, compressor, alternator etc. just to make sure nothing is loose and ratttling.

Cluncking upon acceleration, or shutting off engine is typical of a broken engine mount. Ceck the front sway bar and its bushings at the mounting point on the body.

While at it also rule out the broken air filter housing mount. Although this usually gives a terrible vibrating sound.

Good luck keep us informed as to what happens.

MVK
__________________
One penny saved is three penny earned.

1985 300D Turbo 179,000miles
Reply With Quote
  #5  
Old 08-18-2002, 03:03 PM
Palangi's Avatar
L' Résistance
 
Join Date: Dec 2000
Location: Republique de Banana
Posts: 3,496
I wouldn't be surprised if the air cleaner mounts are broken. (Cheap and easy fix) Worn engine mounts and engine shocks will shorten the life of the air cleaner mounts. In other words, you might have both problems.
__________________
Palangi

2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg



TRUMP .......... WHITEHOUSE
HILLARY .........JAILHOUSE
BERNIE .......... NUTHOUSE
0BAMA .......... OUTHOUSE
Reply With Quote
  #6  
Old 08-18-2002, 04:52 PM
simon288
Guest
 
Posts: n/a
Thanks to all who read/posted replies.

These are great suggestions as to the clunking noise. I forgot to mention in my original post that I have already changed both engine mounts a couple of times. Each time I changed the mounts, the clunking noise will disappear but over a short time come back again.

I was thinking maybe I should change the transmission mount as I am sure it is original and has never been changed.

A couple of you suggested the noise might be due to a broken air filter housing mount or the front sway bar. The housing mount is fine. I was thinking it could be the front sway bar. I'd like to check this out. Where is the front sway bar located?

Also, have any of you had this clunking noise happen when you shut off the ignition and what you did to fix the problem.

Thanks to all.

Have a pleasant day!
Reply With Quote
  #7  
Old 08-18-2002, 08:26 PM
MVK MVK is offline
Registered User
 
Join Date: May 2002
Location: Queens, NY
Posts: 447
Hi Simon:
The front sway bar runs parallel to the fire wall connecting the upper control arm on each side.
Look for the upper control arm and in the middle of this upper control arm is the place where sway bars are connected. Trace it down futher towards the fire call and you will see the point of attachment for the sway bar to the body using a rubber mount. Check the condition of that rubber mount. Also move the sway bar using your hand it shoud not be loose.

MVK
__________________
One penny saved is three penny earned.

1985 300D Turbo 179,000miles
Reply With Quote
  #8  
Old 11-14-2007, 12:43 PM
RAYMOND485
 
Join Date: May 2005
Location: CALIF
Posts: 508
Clunking Front 300d

1984 300d Turbo 145k
One Of The Three Bolts On The FRONT Lower Rear Guide Rod 13 Mm Bolts Was Not Torque, Now Ok, No More Clunking Over Small Road Bumps Slow Speed Over Yellow Lane Markers

Last edited by RAYMOND485; 11-14-2007 at 12:46 PM. Reason: LOCATION OF BOLTS TO CHECK
Reply With Quote
  #9  
Old 11-16-2007, 09:49 AM
Registered User
 
Join Date: Nov 2007
Location: Central Florida
Posts: 4
Not to oversimplify, but my 85 300SD was acting as you described.
I found the exhahst system muffler hanger oring torn on the drivers side. Whe the Ex system was shaken sideways - no noise, when I lifted it vertically slightly it collides with the mount bracket and made the heavy sounding clunking. Takes 10 seconds to check.

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 02:47 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page