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Old 09-28-2001, 09:21 AM
Robert Boyer
Posts: n/a
W126: rear exhaust rubber donuts: specs

Regarding these rear donut hangers, I suspect that I am using the wrong ones which stretch a bit too much and allow too much play in the exhaust.

I have been using the basic donut shaped ones, which do not have the cross-section in them. I think that allows the exhaust system to ride a bit lower than it should. When installed, the exhaust has about 2 inches of side-to-side play available. It also rides about 1 1/2 inches below the upper rubber stop.

Should I be using a shorter donut, or the one with the rubber cross-section?

Please advise. Thanks.

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Old 09-28-2001, 09:48 AM
Q Q is offline
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Join Date: Aug 2000
Posts: 839
You can find the correct ones for very cheap in the "FastLane".
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Old 09-28-2001, 09:53 AM
Robert Boyer
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exhaust donuts

Thanks, Q. However, I'm leaving tomorrow on a long trip. And I thought if I could have my specific questions answered under those circumstances, I can deal with it locally. Thanks.
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Old 09-28-2001, 10:18 AM
J.HIDALGO's Avatar
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Join Date: Jul 1999
Location: Jax, FL
Posts: 1,785

Try Pepboys. I found some there. They work fine for me although they don't have the star. About the same price as Fastlane...
'86 300E
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Old 09-28-2001, 10:25 AM
Robert Boyer
Posts: n/a
rubber donuts

Thanks, J. Hidalgo.

However, just another question: should I use the shorter ones with the rubber cross section, or just the elongated plain ovals?
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Old 09-28-2001, 12:13 PM
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Join Date: Oct 1999
Posts: 1,562
if going non OE/OEM route- seek to use pieces that look to duplicate OEM design and measurements (if OEM has the rubber bar acrossm that'll be your target)

for a back up plan- if the above choice is not available- try to use as sturdy/heavy/quality do-nut that you can find that will give you the tightest fitting (after installed)

>also, these things are soo cheap, might as well do all the rubber hanger/ attachment/ do-nut(s) while you're under there (excepting those that have been replaced recently)

likely the other do-nut(s) are in almost ready to be replaced condition

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Old 09-28-2001, 12:26 PM
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I just replaced my rubber hangers back in november 2000 and last sunday morning I went out to the garage and my exhaust was sitting on the floor under the car I paid the shop 110.00 to replace all four of them in November . This time I took matters in my own hands I used wires to tie up the exhaust . Not a very good fix as the vibration is felt inside the car while sitting at stop lights. I guess I will get a new set of rubbers and try installing them myself I hope that I don't have a hard time installing them like my independent mercedes shop did took the tech about one hour fighting to get them on . Oh btw these were the good square black rubber ones that they installed.Hmmmm..
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Old 09-28-2001, 12:44 PM
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Join Date: Sep 2001
Location: Queens, NYC
Posts: 158
$110 to change donuts?

Starfighter.. try this:

Go to your local MB dealer and get the real donuts with the middle section - this will keep the muffler from bouncing up and down, which is why the o-ring ones can come loose (all that play in them)

Pull out a regular floor jack, roll it under the muffler, put a board in between, jack up the muffler and you should be able to change them with ease.

No need to jack up the car.

2003 S500 Black/Charcoal
1990 560SEL 61k Arctic White/Grey

1988 420SEL Black/Palomino Sold @ 85k
1987 420SEL Midnight Blue/Grey
1986 420SEL Diamond Blue/Grey
1983 380SEL Champagne/Palomino
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Old 09-28-2001, 12:56 PM
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Join Date: Oct 1999
Posts: 1,562
everyone knows the best do-nuts to get are the fresh ones! (maybe you had the old batch, 'cause fresh ones normally span years of use)

...the install should definitely not take an hour (unless there was a lot of focused drinking, socializing, and gabbing going on)...and a tech with minimum skills should be able to do this blindfolded and drunk in 15 minutes

...on your install (open your beer), support the exhaust system using a wooden block and your garage jack- lifting the exhaust as close to the undercarriage as possible

take a swig of your beer (or beverage of choice)

work on one hanger at a time:
remove one hanger, using leverage action from a long screwdriver- take another swig- pick up the new hanger- take another swig- - muster up a big piece of spit in your mouth and let it fly targeting the inside portions of the do-nut in your palm- - - another swig- - and slide the first side on then use that leverage action again to get the mating piece attached (you may also optionally shoot a few higher lubricity loogies over to the exhaust mounts and chassis mount points to aide in the lube process- do not use a lube that attacks rubber)

repeat the above till all the do-nuts have been replaced moving the jack and wooden block to the most appropriate lift points to close the gap between the exhaust hangers and mount points

oh, take another swig....and enjoy - - and - - make sure that any 'hard mounts' of you exhaust system are also in operation (ie your system may also use some type of metal bolt(s) to a chassis mount (for support) so the rubber do-nuts are not accepting 100% of the exhaust system weight- may be cause premature do-nut failure)

have a great day

PS- if you're ever near SF, CA- I'll install these for you for half of what your last labor bill; bring the right parts- no need for appointment - and I'll have you in and out in less than an hour
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Old 09-28-2001, 01:08 PM
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Hey Fad ,I think you are right about fresh verses years old donuts sure would be nice if the dealer had a sign in there window that says hot now like krispy kremes mmmmm dohhnuts,mmmmhalf&half ummm I gotta go get my donuts now really I'm gonna get this licked today.

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