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 02-06-2005, 10:04 PM
jacrouch's Avatar
Registered User
Join Date: Jan 2005
Location: Virginia Beach, VA
Posts: 195
knocking noise and vibration (please's getting worse)

my car makes a rapid knocking noise accompanied by a fairly rough vibration. the noise comes from the rear of the car. it does it about 60% of the time, and only while i'm moving. it sounds as if something is loose somewhere. anyone know what this could be?

1985 300D Turbo "Eunis"
Reply With Quote
Old 02-06-2005, 11:04 PM
Registered User
Join Date: Aug 2002
Location: NE Okla
Posts: 1,104
Check your rear axles for torn boots. If there are any, it is almost for sure that the CV inside is bad. If boots are all ok, then it will be a bit harder to tell for sure, but very likely one or more has gone bad. Lots of posts about what to do about replacement, just search for 'CV joints' or 'half shafts'.
1961 190Db retired
1968 220D/8 325,000
1983 300D 164,150
Reply With Quote
Old 02-07-2005, 10:22 AM
JamesStein's Avatar
Registered User
Join Date: Apr 2004
Location: Tallahassee, FL
Posts: 586
Check out your axles. Both sides and both boots and check them for tears. Also take a good hard look at your flex disks. One up by the transmission and one by the differential.
'84 300CD Turbo 132k (Anthracite Grey) - WVO - My daily driver - Recently named coo-coo-coupe by my daughter.
'84 300D Turbo 240k (Anthracite Grey) - Garage Queen
'83 300D Turbo 220k (Orient Red) - WVO - Wifes daily driver

I'm not a certified mechanic, but I did stay at a HolidayInn Express last night.
Reply With Quote
Old 02-07-2005, 11:13 AM
Larry Delor's Avatar
What, Me Worry?
Join Date: Jun 1999
Location: Sarasota, Fl.
Posts: 3,112
Eyeball the driveshaft support bearing also. A relative had theirs go bad, and the description sounds similar.
It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein

09 Jetta TDI
Reply With Quote
Old 02-08-2005, 02:13 AM
Fishslayer's Avatar
Registered User
Join Date: Sep 2004
Location: Plainfield, Il.
Posts: 59
If it sounds like its coming from one side don't rule out the parking brake, if not adjusted right or not used often, a chunk of rusty cast iron can bind on a shoe and make a hell of a racket. Usually after its been driven a while and warm. If it does it all the time look at the axle shafts as others have said.

Good Vibrations, James
This Space For Rent
Reply With Quote
Old 02-08-2005, 09:38 PM
jacrouch's Avatar
Registered User
Join Date: Jan 2005
Location: Virginia Beach, VA
Posts: 195
well, i just finished checking the cv boots...everything looks good there.

i wasn't going to mention this because at first i thought that it wasn't related to this problem, but now i'm not so sure...while the car is moving, i can feel a rythmic bouncing up and down. it doesn't seem to get faster as i pick up speed. is this related to my original problem?
1985 300D Turbo "Eunis"
Reply With Quote
Old 02-08-2005, 11:50 PM
Registered User
Join Date: Nov 2004
Location: Nova Scotia, Canada.
Posts: 6,510
bouncing up and down-clunking

Probably time to get this car up on a hoist and start checking things out. Its not going to fix itself and since symptoms are changing could be the damage is increasing since original clunking or whatever. Certainly cheaper to diagnose or have diagnosed before car leaves you stranded and perhaps in hands of total strangers to get it back on the road. You could jack up one rear wheel at a time and see if it moves by grasping top and bottom. Pushing the top and pulling the bottom of wheel and reversing the procedure. In fact just grab the top of each tire and push and pull hard with car sitting on ground should suffice. Just compare to other side as both should have equal play if any. (possible rear bearing failure) If car passes that next proceed to compare cv joints on one side with the other by turning tires back and forth. check for abnormal clunks, play, etc again it is by comparison of one side to another that counts. Also grab 1/2 shaft and push up and down aggressively again comparing one side with other. Above tests may reveal nothing but there is also a chance they will. Plus as an added bonus you might repair it for less than the towing charge if it goes down on the road. Make sure it is also not just a loose wheel check your wheel bolts. While you have car securly jacked and blocked up or on hoist it is quite easy to check your centre driveshaft bearing carrier and rubber universal disks and make sure everything in the back end is bolted down. Examine your rubber bushings that support rear suspension to see if they have wore out as well. In otherwords have a good look around. Since people on this site can not actually hear the problem firsthand and have no knowledge of your experience level i assume you have checked that all the rubber muffler hangers are in place. But the up and down gyrations are raising a little concern in my mind and especially as they do not appear to change with speed. (lets out tire problems like broken belts etc).

Last edited by barry123400; 02-09-2005 at 12:07 AM.
Reply With Quote
Old 02-14-2005, 08:52 PM
jacrouch's Avatar
Registered User
Join Date: Jan 2005
Location: Virginia Beach, VA
Posts: 195
the belts were broken and flopping around inside the tires, and also the tires weren't round. i had new tires put on it, which definitely fixed the problem.

1985 300D Turbo "Eunis"
Reply With Quote
Old 02-14-2005, 09:00 PM
dieseldiehard's Avatar
Join Date: Oct 2002
Location: Bay Area No Calif.
Posts: 4,287
i had new tires put on it, which definitely fixed the problem.

this may have saved your life, too. count the roll-overs that have happened due to defective/failing tires.

'00 E320 (wifes car), '95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!
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

Similar Threads
Thread Thread Starter Forum Replies Last Post
W202 heater fan noise & vibration??? MarkC Tech Help 10 08-21-2008 11:06 AM
vibration noise not wheel balance Thai GI Tech Help 2 07-18-2006 12:24 PM
Metal on metal vibration noise...plese help! Badinfo Tech Help 4 04-07-2003 09:29 PM
Manual Transmission Noise & Vibration Tim the Taxman Diesel Discussion 9 09-20-2002 03:08 PM
98-320, Vibration noise HELP Mark Elrod ML, GL, G-Wagen, R-Class, Unimog, Sprinter 7 08-13-2002 10:58 PM

All times are GMT -4. The time now is 12:14 AM.

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