Clunking sound under accel/decel
Thread Starter
Member
Joined: Sep 2006
Posts: 228
Likes: 42
From: North of San Francisco
14 E550, 07 E550, 69 Mach I, 65 Hipo, 66 Fairlane GTA Conv, 66 Fairlane GT
Clunking sound under accel/decel
I'm getting a pretty good clunk from the rear end or rear suspension under both hard acceleration and abruptly letting off the gas. Most likely it is one of the rubber joints failing in the rear suspension. It doesn't feel/act like a bad u-joint.
Before I jack up the car, put on my grubbies, and just start poking around, I thought I would defer to the wisdom and experience here first as I have in the past.
Thanks!
Before I jack up the car, put on my grubbies, and just start poking around, I thought I would defer to the wisdom and experience here first as I have in the past.
Thanks!
Last edited by John H; Aug 21, 2010 at 05:59 PM.
Member
Joined: Feb 2010
Posts: 83
Likes: 5
From: NC
2006 CLS55
Hi John
I think you might be on the right track with the rubber bushings in the rear suspension. What about the rubber donuts on each end of the drive shaft. Not sure if these could make that kind of noise?. Could also be a motor or trans mount if they are worn bad enough. I see some of the spare parts sellers list new mounts for the rear subrame also, I guess they sell them for a reason.
I for one would be interested to know what you found the problem to be.
I think you might be on the right track with the rubber bushings in the rear suspension. What about the rubber donuts on each end of the drive shaft. Not sure if these could make that kind of noise?. Could also be a motor or trans mount if they are worn bad enough. I see some of the spare parts sellers list new mounts for the rear subrame also, I guess they sell them for a reason.
I for one would be interested to know what you found the problem to be.
Thread Starter
Member
Joined: Sep 2006
Posts: 228
Likes: 42
From: North of San Francisco
14 E550, 07 E550, 69 Mach I, 65 Hipo, 66 Fairlane GTA Conv, 66 Fairlane GT
Thanks for the reply. I was thinking it may be an engine/trans mount too. I might just change those out first as they are on my 'to do' list and were one of the best things I ever did on my 300E.
Well, rather than jack 'er up and poke around I did what any MBWorld member would do. I posted here and then went out and washed my ride. Actually, I didn't have that much time and I had a pinched nerve in my back from carrying my napping 3 yo around at the local car show the week before.
The backs getting better so I will be checking it out this weekend and will let you know what I find.
Well, rather than jack 'er up and poke around I did what any MBWorld member would do. I posted here and then went out and washed my ride. Actually, I didn't have that much time and I had a pinched nerve in my back from carrying my napping 3 yo around at the local car show the week before.
The backs getting better so I will be checking it out this weekend and will let you know what I find.
Thread Starter
Member
Joined: Sep 2006
Posts: 228
Likes: 42
From: North of San Francisco
14 E550, 07 E550, 69 Mach I, 65 Hipo, 66 Fairlane GTA Conv, 66 Fairlane GT
It's the motor mount.
I did the "one foot on the brake and one on the gas" test at idle and the motor jumped up a couple of inches.
This was an easy replacement job on my 300E. Anyone have input about this job on the 55? Part brand? I plan on doing the tranny mount too.
I did the "one foot on the brake and one on the gas" test at idle and the motor jumped up a couple of inches.
This was an easy replacement job on my 300E. Anyone have input about this job on the 55? Part brand? I plan on doing the tranny mount too.
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Joined: Feb 2008
Posts: 1,803
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From: Charleston, SC
GL450
Tranny mount is very easy with a lift, but it's in the middle of the car, so hard to do unless you jack the whole car up.
Engine mounts you can find a DIY on here.
I took the parts to an independent and paid maybe $200 total for install. If you DIY, stay safe. If a jack goes out you can drop the block on your hand.
Engine mounts you can find a DIY on here.
I took the parts to an independent and paid maybe $200 total for install. If you DIY, stay safe. If a jack goes out you can drop the block on your hand.
Thread Starter
Member
Joined: Sep 2006
Posts: 228
Likes: 42
From: North of San Francisco
14 E550, 07 E550, 69 Mach I, 65 Hipo, 66 Fairlane GTA Conv, 66 Fairlane GT
Well, the driver side mount was completely seperated into two pieces. The pass side was sacked out as well. Much smoother at idle in gear. I've been babying the car for two weeks - now I can play again!
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Thread Starter
Member
Joined: Sep 2006
Posts: 228
Likes: 42
From: North of San Francisco
14 E550, 07 E550, 69 Mach I, 65 Hipo, 66 Fairlane GTA Conv, 66 Fairlane GT
Did the job myself.
I started with the driver's side which turned out to be the harder of the two due to the steering box. A no-offset 16mm wrench is a must for the top bolt. It took about 45 minutes start to finish inuding the learning curve having never done this on the 55. Tranny mount took all of five minutes thanks to the geninus at MB who had the forethought that one day the mount would be replaced.
Almost hard to tell the engine is running at idle now.
I started with the driver's side which turned out to be the harder of the two due to the steering box. A no-offset 16mm wrench is a must for the top bolt. It took about 45 minutes start to finish inuding the learning curve having never done this on the 55. Tranny mount took all of five minutes thanks to the geninus at MB who had the forethought that one day the mount would be replaced.
Almost hard to tell the engine is running at idle now.
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