BMW R850, R1100, R1150, R1200 Oilhead Maintenance Manual

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Filed Under (BMW) by admin on 16-11-2010

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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. Change Alternator Belt Tools Parts T-handle hex – 4mm alternator belt socket – 13mm ratchet wrench – 13mm torque wrench 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. Loosen the 2 nuts and 1 bolt, 13mm, that hold the alternator – one is on top and one is on each side, thus allowing the alternator to pivot down. 4. Remove the old belt. (Some bikes have a pipe that traps the belt – loosen it enough to get the old belt out and the new belt in) 5. Install the new belt being sure it is properly seated. 6. BMW calls for a tensioning torque of 5.9 ft.lb. (8 Nm) on the adjuster bolt on the left side of the bike. You have to get at this bolt from the alternator side and you may have to lift the tank. Alternatively, you can pry the alternator up with a large screwdriver to tension the belt. 7. Once the belt is under proper tension, tighten the 2 nuts and 1 bolt, 13mm, to 15 ft.lb. (20 Nm). 8. Check the belt for proper tension (see above) and proper seating alignment

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