Before proceeding with the replacement of the belt, brake the car with the parking brake and turn on the IV gear. Remove the toothed belt cover. Loosen the alternator drive belt and remove it from the pulleys. Remove the alternator drive pulley from the crankshaft and screw the pulley bolt into place.
Set the gear lever to neutral position and turn the crankshaft clockwise until the mark on the flywheel (see fig. 52), visible in the hatch of the clutch housing, was against the middle division of the scale. In this case, the mark on the camshaft pulley must be against the alignment mark on the rear toothed belt guard.
Loosen the nut securing the tensioner roller axis and turn it to a position in which the belt will be as loose as possible. Remove the belt from the pulleys.
They put a new belt on the crankshaft pulley and, pulling both branches of the belt, put the left branch on the coolant pump pulley and wind it behind the tension roller. Put the belt on the camshaft pulley and slightly tighten it with the tension roller, turning the roller axis counterclockwise. When installing the belt, its sharp bends are avoided.
Turn the crankshaft two turns clockwise and check if the alignment marks on the pulley and the rear toothed belt guard match, and also if the mark on the flywheel is against the middle division of the scale (see fig. 52).
If the marks do not match, then repeat the operation to install the belt. If the marks match, then unscrew the bolt from the crankshaft, install the generator drive pulley and fix it with a bolt and washer, finally tightening it with a torque of 10.5 kgf-m.
Adjust the belt tension as indicated in sec. «Engine settings», and install the front toothed belt guard. Put on the alternator drive belt and adjust its tension (see ibid). Check and, if necessary, adjust the ignition timing.