Mercedes Benz repair: Alternator Replacement 1989 mercedes 300se, pulley bolt, pivot bolt

Question
How do I get the belt tensioner to move. I can't get the belt back on because I don't know how to move the belt tensioner.

1989 Mercedes 300 SE

Answer
The tensioner pulley ARM pivot bolt (not pulley bolt) must be loosened first.
You will find the following NUT sticking up on the driver side front between the engine/power steering pump, loosen it as needed, (if it binds or breaks, it must be replaced).

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PART NUMBER SEARCH RESULTS WITH PRICES
Vehicle 1989 Mercedes Benz 300SE
Part: Acc. Belt Tension Adj.
 Note:  W/ Nut
G6002-60237 Acc. Belt Tension Adj. IN STOCK $20.28  

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Accessory Belt Tensioner Bracket  
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Accessory Belt Tensioner
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Acc. Belt Idler Nut
Acc. Belt Idler Pulley...
Acc. Belt Tension Adj.
Acc. Belt Tension Damper
Acc. Belt Tensioner Brkt
Accessory Belt Tensioner

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PART NUMBER SEARCH RESULTS WITH PRICES
Vehicle 1989 Mercedes Benz 300SE
Part: Accessory Belt Tensioner
 Note:  
With aluminum cast arm that pivots and holds tension on poly-belt via a threaded rod that adjusts to desired setting. Includes 103 200 05 70 pulley. Does not include 103 200 02 36 adjusting rod.     
G6000-41536 Accessory Belt Tensioner IN STOCK  $140.45  

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PART NUMBER SEARCH RESULTS WITH PRICES
Vehicle 1989 Mercedes Benz 300SE
Part: Acc. Belt Tensioner Brkt
G6009-71687 Acc. Belt Tensioner Brkt IN STOCK $17.15  
  
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PART NUMBER SEARCH RESULTS WITH PRICES
Vehicle 1989 Mercedes Benz 300SE
Part: Acc. Belt Tension Damper
 Note:  Shock absorber
G6003-14301 Acc. Belt Tension Damper IN STOCK $35.76

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