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Originally Posted by 97 SL320
I'm on a dial up so vids won't work for me.
From what you describe, the rocker shaft will likely be worn as well. New bushings will help but not solve the entire problem.
Bushings of this type generally will be pressed into place then honed to fit, this will take care of some of the shaft wear. ( bushings are undersized when new, think connecting rod pin bushings for full floating pistons. ) But, . .since the center of shaft is worn and not the edges, the bushing can only be made so tight.
What sort of use does this car see? If limited use I'd be OK with bushings being honed on the tight side, pushed over the unworn section to the worn section and call it a day.
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I drive this car a good amount for something of its vintage. Roughly ten miles/week then back and forth to a couple good car shows + some beach trips - maybe about 1000 miles/year.
The head was "rebuilt" about ten years ago, and the mechanic did not replace these bushings at the time of rebuild (frustrating)... So I'd feel comfortable replacing all thats worn for the sake of not having to do it for a long time.
I agree that the rocker shaft is worn as well. I'll get price quotes on those, hopefully they aren't insanely expensive.
Sounds like this may not be a DIY task? I was thinking I could remove the whole rocker/shaft assembly and bring it to a machine shop but am anxious about mixing them up upon reassembly. I've heard Mercedes is very anal about keeping the correct rockers with their corresponding cam lobes.