Disassembling Front Upper Control Arm Bushing (w108) - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 07-01-2010, 08:26 AM Thread Starter
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Disassembling Front Upper Control Arm Bushing (w108)

It's that time to replace my control arm bushings on the 70 280SE! And I'm lost on how to disassemble the upper/outer control arm bushings. I got the nut off the bolt and try to: thread it out (seems theres a pin that locates the bolt) to no avail and have tried to hammer the thing out (with the nut on and with a brass hammer) but it doesn't even budge!

Done:
- removed "V" clip
- removed nut
- drenched everything in PB Blast
- Hammered until my arm hurt

What's the deal? The car is a big weathered but the damn thing won't move. Could someone explain how to get the bolt out please!

pic for reference:


I rarely get stuck on things like this but right now I'm at a loss! Any tips would be appreciated!

Last edited by Ratty111; 07-01-2010 at 09:07 AM.
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post #2 of 6 (permalink) Old 07-01-2010, 12:08 PM
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It's simple. Lack of scheduled lubrication has caused the long bolt and the threaded bushing to weld together. You will have to cut the bolt and remove the kingpin. A new kingpin is required.

Near Manassas Va. '65 220S, 2006 Ford Crown Victoria Police Interceptor, '99 Volvo V70, '72 350SL 4 speed

Not part of the in-crowd since 1952. It's BRAKES not breaks. You break a bone, use brakes to stop your car. /rant

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post #3 of 6 (permalink) Old 07-01-2010, 12:27 PM Thread Starter
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yikes.. you don't believe that some heat and an air hammer would free it?


I do suppose it's time for the king pins to be replaced as well..
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post #4 of 6 (permalink) Old 07-02-2010, 01:25 PM
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Do a search for kingpin in this board:

Drive train, fuel, suspension, steering & brakes

Most cars of the 60's use the same front suspensions.

Near Manassas Va. '65 220S, 2006 Ford Crown Victoria Police Interceptor, '99 Volvo V70, '72 350SL 4 speed

Not part of the in-crowd since 1952. It's BRAKES not breaks. You break a bone, use brakes to stop your car. /rant

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post #5 of 6 (permalink) Old 07-03-2010, 11:02 AM
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Wbain, is correct, saw the bolt off on both sides of the kingpin, chances are good that the slug in the kingpin head will release and be easily removed. I've had to do this a few times. And I have a few spare kingpins if it can't. Check the big holes in the upper A-arm for cracks.

Lube is everything on the old front axle.

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post #6 of 6 (permalink) Old 05-06-2013, 10:25 AM
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The nut comes off and the pin tapped out using a steel drift that's smaller than the bolt diameter. Once out, the centering bushing screws of of the king pin
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