940 L4-2320cc 2.3L DOHC VIN 89 B234F FI (1991)
Remove protective rubber cap over locknut.
Position gauge in measuring zone.
Insert screwdriver between tensioner pulley and spring carrier pin.
If belt tension is too low:
Move roller to adjust belt tension to 6.0 ± 0.2 units.
If belt tension is too high:
Adjust to obtain reading of 5.0 ± 0.2 units.
Tighten tensioner locknut.
Turn crankshaft clockwise
Turn crankshaft to rotate camshaft pulleys through one revolution.
Belt tension should now agree with specified value of 5.5 ± 0.2 units.