Quote:
Originally Posted by Ivanerrol
The M103 belt tensioners are a notorious pain. They break down and need to be replaced.
The 19mm bolt must be loosened before the adjuster is turned otherwise it results in failure of the adjuster such as this.
You mention that the 19mm bolt is missing. Hmmmm. The tensioner will not stay in place without this bolt.
Note location of 19mm bolt
There is an indicator that will tell you if the tensioner is at the right place. You can make it out in the above image - it's the "ramp" with a yellow coloured indicator just to the right of the 19mm bolt.
The tensioners have a rubber bearing. The rubber looses it's tension over time. The idler pulley does not sit straight causing the serpentine belt to get loose and squeak. |
The tensioner on my M103 does not have that indicator or the "ramp" mark on it. I just had to guess when I replaced the belt!  Its been fine for 12k so far, so I must have guessed right.....but this summer I am going to replace the whole tensioner out of paranoia.
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