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1987 300TD - 1981 300D - 1990 190E 2.6 (Non Running for Sale) - 1993 190E 2.3
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285 Posts
Discussion Starter #1
1981 300D

Ok...I had a fit with all of this while attempting a full belt change...so I wound up pulling the whole bracket out and re-enforcing it by welding a piece of steel to it...well, it is to the very end of the grooves for adjustment and there is still much room to go for the belt. the belt is a Connitech 1030 and it goes around water pump and alternator. The end where the adjustment bolt is is pretty buggered up so maybe I just need a new one...any thoughts?

It looks like this:
123 126 Genuine OEM Alternator Mounting Bracket | MercedesSource.com

Here is a note from Mercedes Source could this be my issue? it is not a 300SD:
PLEASE NOTE: Most 1981-1985 300SD Models have different size alternator belts. (other belts are ok). If you have a 300SSD you must check the size of your alternator belt before ordering. If unsure please note your belt size before ordering! The alternator belt size in this kit is 10 x 1035. Many 300SDs use 10 x 1000 belts. We can substitute the shorter belts but you must inform us via email. If you order the wrong belt they are not returnable.
 

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'73 450SL, '83 300CD, '01 E320 4matic
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2,446 Posts
Isn't that the most piss-poor design ever?

I did the same thing when I had the 300CD- welded little gussets into the bracket to keep it from bending.

If you're getting all the way in though, I'd say you need a belt that's 1/2" to 1" shorter.
 

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1987 300TD - 1981 300D - 1990 190E 2.6 (Non Running for Sale) - 1993 190E 2.3
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285 Posts
Discussion Starter #4
Ok

I would the 10 x 1000 instead of 10 x 1030 work? And I broke the rod now, so that's cool...
 

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1981 240D California version
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169 Posts
holy crap! $74 for that stupid little bracket? I know Mercedes Source is a little more expensive, but geez! I stripped out my alternator adjusting bolt but I'm just going to the junkyard tomorrow to get another one. I'll probably pay $5 for the whole setup. Even AutohausAZ has those at $40 something for that stupid little bolt! If this was a Ford forum, those parts would cost $20 combined!
 

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1983 300D Turbo Diesel
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1,799 Posts
Just wondering, can a bent bracket make the belt squeak?
I think it would if it was throwing off the alignment to the other pulleys. it would be riding on the edges of the pulleys instead of in the "V".
 

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2013 MINI Copper S Clubman, '84 300CD-weekend car
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10,152 Posts
^^Uneven wear on the bearing too, thereby shortening it's life. I'll suggest not running the car much until you get it straightened out.
Once you understand how to make adjustments, it's not a bad system, per se, the problem comes with folks not knowing how to properly complete the procedure, ending up breaking something.
Having said that, most of those "L" bolts I've seen are bent a bit on the end.
 

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'73 450SL, '83 300CD, '01 E320 4matic
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2,446 Posts
......it's not a bad system, per se...

It's not a GOOD system by any means...

MB over-engineered just about everything on our cars... but they skimped on window regulators and this stinkin' bracket.

The design would work OK if the metal bracket was one gauge thicker and the bolt was about 2 sizes larger in diameter.

I'm guessing they just never planned on them lasting 30 years.
 
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