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  #1  
Old 11-16-2017, 11:52 AM
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mercedes w123 300td 1983 trailing arm bushing question

Hello
My outer/front trailing arm bushing on the passenger side is shot and makes a rumbling noise on bumps. How unsafe is this? The arm itself is very solid.
Do I have to removing the whole arm to replace the bushing? I have done the fronts and did them in place. Has anyone just replaced one? It is getting cold here and I would like to wait for Spring if possible.

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Old 11-16-2017, 02:59 PM
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1991 300D 2.5 Turbo
 
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I wouldn't drive it with a totally shot bushing allowing a trailing arm to flop around.
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Old 11-16-2017, 03:03 PM
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I don't want to either, but why would you not drive it? What are the consequences? What chances am I taking? What could happen other than beat the crap out of my tire?
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Old 11-16-2017, 05:20 PM
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The rear wheel steering effect that you can get with a loose rear end isn't entertaining for everybody. Someone not used to it could overcorrect and lose control, maybe roll it. I'm gonna fix my lose rear end as soon as I get a winter beater on the road.
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Old 11-16-2017, 08:19 PM
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I think your W123 setup is similar to my W126 in the rear.
I didn't have to pull the trailing arm. With the rear tires on ramps, I used a floor jack to lift on the front part of the trailing arm, just enough to release the tension and unbolt the front bushings. Then lowering a bit to press the bushings out. I used some 5/16 all-thread, large washers and 3/4 Dr. sockets to press the bushings in/out.
The main thing is to use chocks, or similar, to lock the tire in place. This enables you to just raise the jack and rebolt. If you don't, and the wheel moves, make sure there are no sensitive ears around to hear the cursing. You will need to drop the entire subassemby to get it to bolt back.
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Old 11-16-2017, 10:13 PM
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1991 300D 2.5 Turbo
 
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Quote:
Originally Posted by ottojd View Post
I don't want to either, but why would you not drive it? What are the consequences? What chances am I taking? What could happen other than beat the crap out of my tire?
With the fore bushing gone and the trailing arm flopping, you will get increased wear on the aft bushing. I imagine that sometime along the way the mounting points on the chassis are going to get wallowed out if not the trailing arms themselves. More $$$ to fix.

I'd also be worried about emergency maneuvers like moon161 pointed out.
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1991 300D 2.5 "Rocinante"
2002 Golf TDI "Teen Spirit"
--------------------
1984 300D
1966 Mustang I6 3sp
1985 Mazda RX-7 GSLSE
1982 Toyota Supra
1977 Datsun 280z
1971 Datsun 240z
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Old 11-16-2017, 10:15 PM
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Would the parking brake hod the wheel in place?
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Old 11-16-2017, 10:23 PM
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That makes sense about the wear around the hole in the frame...
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Old 11-16-2017, 10:24 PM
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And the holding of the wheel was in regard to SD Blue's reply.
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Old 11-17-2017, 12:49 PM
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Quote:
Originally Posted by ottojd View Post
Would the parking brake hod the wheel in place?
Yes, IIRC that was all I used for the second side. The added chock was probably overkill but I didn't want to add to the frustration. Once it's locked into place, the job is really pretty simple.

You'll wonder at the difference afterwards. You may even search out winding roads!

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