I’m guessing that’s what the dealer did but it didn’t last. I’m fed up with 
tightening that belt so I just bit the bullet! 

Sent from my iPhone

> On Jan 5, 2018, at 9:51 PM, Curley McLain via Mercedes 
> <mercedes@okiebenz.com> wrote:
> 
> The old fashioned way to tighten an alt is to put an prybar/crowbar between 
> the block and the front of the alt.  Tension belt with the bar, and lock down 
> the alt bracket with the other hand.  I have done this on MBs with buggered 
> adjuster devices.
> 
> All the old Deetriot iron was adjusted this way.
> Your new adjuster will be nice when it is on.
>> Dimitri via Mercedes <mailto:mercedes@okiebenz.com>
>> January 5, 2018 at 8:38 PM
>> The alternator belt on my 78 240D cannot be properly tightened because the 
>> “rack and pinion” teeth on the mounting bracket are all worn. This problem 
>> left me stranded on a trip from Boston to DC over a year ago. It’s an 
>> adventure I described at the time but briefly, the belt flew off on the 
>> freeway. I got towed to flaps where I replaced belt in the rain but could 
>> not adequately tighten due to worn teeth. I drove to dealer over an hour 
>> south where they took me in on an emergency basis to get me back on the 
>> road. They tightened the belt with much difficulty and would not guarantee 
>> work as parts needed replacement which they didn’t have on hand. I drove the 
>> car until a couple of weeks ago when belt loosened to the point where 
>> battery would no longer charge. I ordered new parts from classic center 
>> totaling $150. Just got them in today. Planning on installing next week when 
>> it “warms up”.
>> 
>> Sent from my iPhone
> 
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