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Originally Posted by meltedpanda
oh really, where and how accessed , do you have a link ( no pun  ) you could point me to??
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On my engine, 117.985, manual say's to remove right exhaust manifold and pipe. I have no idea why they would suggest that, as access to the tensioner is not an issue and quite easy.
On your engine, they suggest removing the upper engine shock mounting bracket . Maybe yes, maybe no. You'll have to see what access you have to get at the bolts. I believe the early tensioners such as yours can be rebuilt by removing the large hex nut on top of the tensioner and swapping out parts. Might be easier to just but a new one as it's not that expensive and alot easier.
chain tensioner.pdf
Sometimes I think the MB manual is designed to pad the dealers repair bill. It is an invaluable guide undoubtably, but don't take everything it say's as gospel. Sometimes the recommended procedures are quite vague, leave out steps or add in steps that aren't required. Example... The procedure for swapping out the upper chain guides doesn't even mention removing the camshaft sprockets, but it's just plain impossible to do without that step. And thats a real
BIG and vital part of the job.