BMW R1100 Spécifications télécharger pdf (Page 14)

Alternator Belt Adjustment - Jon Diaz

The following is not BMW factory procedure....use at your own risk.

I remove the left fairing panel, the airbox horn, and the front cover on the engine block.

The belt needs to be tightened with a 6mm allen wrench from the rear (airbox) side of

the alternator. The allen screw is blind. Do all this when the bike is cold or you will

burn your elbow on the exhaust header.....

I loosen the three nuts on the front (one each side, and one at the very top) with a

13mm box-end wrench, and the alternator belt should go slack.

I then use a large flat-blade screwdriver to pry up the alternator, I get the allen wrench

in the bolt, and put some sort of bar/screwdriver on the end of the allen wrench to give

leverage. The book calls for 6 ft-lb., but since I don't have a wrench which could

reliably go that low, I _lightly_ tension the belt and tighten just the nut on the allen

screw. It does not take much. Then tighten the other two nuts.

The belt should not slide when you try to pull it. I try to tension the belt just enough that

it doesn't squeak/chirp when I blip the throttle while the bike is warming up in the

morning. It might take a few trial-and-errors, but looking at my old belt, it seems to

work just fine.

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BMW R1100 Spécifications Page 14