Author Topic: Rear Radius Arm Bushing  (Read 5345 times)

bpossel

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Rear Radius Arm Bushing
« on: August 14, 2005, 17:47:58 »
Has anyone ever replaced their rear radius arm bushing?  This is the large rubber donut that sits between the radius arm and the underside of the body.

I tried to do mine today.  No luck! :evil:  The BBB shows a special tool (mandrel), so I guess I need this, or need to make a similar special tool?

I did try to persuade the new donut into place by screwing the nut back on the protruding bolt and using a deep socket with an extension, along with some vasoline for an easy slide...  but each time I jacked up the radius arm, the rubber donut popped back out :( .

 :?: Does anyone have any suggestions, or tricks on how to refit a new rubber donut?  I think the entire arm is off approx 1/2 inch or so...

Thanks!!!
Bob

bpossel
Memphis, TN.
1971 280SL
1997 E320
« Last Edit: August 14, 2005, 17:50:06 by bpossel »

JimVillers

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Re: Rear Radius Arm Bushing
« Reply #1 on: August 14, 2005, 18:32:17 »
Bob ... Are you talking about item #153?  If so, just remove bolt #147 to disconnect the rod from the differential and you ar home free.  


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bpossel

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Re: Rear Radius Arm Bushing
« Reply #2 on: August 14, 2005, 19:40:06 »
Hi Jim,

It's item #159 on your pic.  It's cutoff slightly...

Thanks!
Bob


bpossel
Memphis, TN.
1971 280SL
1997 E320
« Last Edit: August 14, 2005, 19:41:18 by bpossel »

jeffc280sl

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Re: Rear Radius Arm Bushing
« Reply #3 on: August 14, 2005, 20:15:57 »
Hi Bob,  

I don't think you need the special tool.  I didn't need it.  You need to improve the alignment first.  I assume the axle has shifted to the rear of the car and that's why your off 1/2 inch.  I have a set of nylon "come a longs" with hooks on each end.  Secure one end to the axle and the other to the thick mounting plate covering the transmission.  Gently winch the axle forward and then try and jack it up into place.  You don't need a tremendous amount of force but you need something to help hold it in place while you jack it up into position.  Remember the spring tension.  Make sure the jack is positioned well so that it does not slip off and be carefull.  Goodluck!



Jeff C.
1970 280SL 4-speed

waqas

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Re: Rear Radius Arm Bushing
« Reply #4 on: August 15, 2005, 00:22:03 »
I agree, you don't need the tool, but I imagine it would help a bit.

I had similar problems, but like most repairs, once you've been through it once, you get the hang of it.  In my case, the trailing arms were off by over 40mm!

You need to apply some rigid lateral forces to align the 'doughnuts' first.  I like the idea of nylon rope and hooks; in my case, I used some steel water pipe and wooden pieces wedged between the trailing arms and my garage walls to laterally align the bushing with the bolt.  I then gently raised the arm using a jack and a piece of wood, applying it under the edge of the bushing which is not supported by the metal lip, and avoiding the centre-cut hole for the bolt to slip through; this will allow you to attach the plate and large nut.

The first side was pain-staking; the other was a breeze (but somewhat time-consuming for a novice like myself).  Good luck!

WAQAS in Austin, Texas
« Last Edit: August 15, 2005, 00:29:05 by waqas »
Waqas (Wa-kaas) in Austin, Texas

ja17

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Re: Rear Radius Arm Bushing
« Reply #5 on: August 15, 2005, 05:20:07 »
Hello Bob,
I use a tube through the rubber bushing and over the metal mount as I am raising the control arm. Seems to help a lot. use a little lube, something which will not attack the rubber. I think a little ATF will work.

Joe Alexander
Blacklick, Ohio
Joe Alexander
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bpossel

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Re: Rear Radius Arm Bushing
« Reply #6 on: August 15, 2005, 20:08:06 »
Success!

Tonight I was able to replace both of the rear trailing/radius arm bushings, the large single donuts that sit in front of each arm.  To line up the rubber donut as I raised the arm, I ended up using a come-along.  Since I had to move my arms back (not forward) approx 1 inch, I tied one end around the outer rear axle and the other end on my son’s truck.  I used a large jack and jacked up the side I was working on under the rear spring so that the wheel was off the ground (this jack has small wheels and was facing forward towards the front of the car, jack handle facing the rear and protruding under the rear bumper).  Then as my son tightened the come-along, I watched the arm move back.  Then I would raise the arm with another small jack and check the alignment (this is a trial & error process)...  Then lowered the arm, releasing the spring tension, then he would tighten the come-along (the tension must be off the spring and wheel off the ground for this to work properly.  Once the arm was back far enough, I raised the arm with the other jack and the rubber donut slide right into place.  My old rubber donuts were not installed properly.  They were not only worn, but the center hole was no longer round but rather oval and very out of shape.

If anyone has any questions on how to do theirs, just ask me.  Now that I have done this, it seems easy.  Need to be very careful doing this procedure.  The spring tension can be very dangerous.  Note:  I also used chocks to block in my wheels.  The chocks really helped to ensure the car didn’t move when we were tensioning the come-along.
Thanks to all for you help!!!
Bob



bpossel
Memphis, TN.
1971 280SL
1997 E320
« Last Edit: August 16, 2005, 04:07:19 by bpossel »

ja17

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Re: Rear Radius Arm Bushing
« Reply #7 on: August 15, 2005, 21:55:02 »
Well done Bob!

You and Erick are really moving along!


Joe Alexander
Blacklick, Ohio
Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback

hands_aus

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Re: Rear Radius Arm Bushing
« Reply #8 on: August 16, 2005, 03:43:07 »
Sorry to seem un-informed but what is a "come-along"?





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bpossel

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Re: Rear Radius Arm Bushing
« Reply #9 on: August 16, 2005, 04:15:19 »
Hi Bob Smith,

Actually I didnt know what this was either until a couple of days ago when Jeff mentioned it....

A come-along is similar to a tie-down.  Large nylon strap (or cable wire), hooks on both ends and a hand jack, ratchet (not sure what else to call this) that lets you tighten the nylon strap (or cable wire).

Hope this helps?
Bob P.  


bpossel
Memphis, TN.
1971 280SL
1997 E320

rwmastel

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Re: Rear Radius Arm Bushing
« Reply #10 on: August 16, 2005, 21:08:31 »
quote:
Originally posted by hands_aus

Sorry to seem un-informed but what is a "come-along"?

http://www.cvfsupplycompany.com/4tonhanpowpu.html

http://www.lug-all.com/pages/webstrapsmall.php

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hands_aus

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Re: Rear Radius Arm Bushing
« Reply #11 on: August 19, 2005, 03:53:25 »
Thanks Bob and Rodd

Bob Smith (Brisbane,Australia)
RHD,1967 early 250 SL, auto
Bob Smith (Brisbane,Australia)
RHD,1967 early 250 SL #114, auto, ps , 717,717
best of the best