BMW R850, R1100, R1150, R1200 Oilhead Maintenance Manual
BMW Riders and Oilhead Riders Cold Engine and Drivetrain Procedures Check Alternator Belt
Tools Parts T-handle hex – 4mm none
Note: In most cases the alternator belt does not need to be checked any more. Early models should have the pulley and belt upgrade that came out a few years ago. Current recommendations are that the belt is installed and adjusted, then not disturbed until 36K when replacement is specified.
1. Remove the four bolts holding the black plastic alternator belt cover at the front of the engine, 4mm T-handle hex.
2. Remove the cover by sliding it straight down.
3. Check the belt for cracks or shredding.
4. Check the belt tension, quite tight, ~1/4” deflection when you press on the center. Note: Paul Glaves suggests that proper belt tension is when you can twist the belt ~90 degrees, midway between the pulleys. If you can twist it more than 90 degrees, it is too loose. If you cannot twist it 90 degrees, then it is too tight.
5. Leave the cover off for the valve adjustment procedure on the next page.
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