Scheme for checking the tension of the pump drive belt
Belt tension is checked by deflecting it between the alternator and pump pulleys or between the pump and crankshaft pulleys. At normal belt tension, deflection A under a force of 10 kgf (98 N) should be within 10–15 mm, and deflection B within 12–17 mm.
To increase belt tension, loosen the alternator fastening nuts, move it away from the engine and tighten the nuts.