2.12.2. Adjustment of a tension of a belt of the drive of the camshaft

Regulate a tension of a belt in the following order:
– remove a forward cover of a gear belt;

Fig. 2.63. Tags for definition of VMT of pistons of the first and fourth cylinders

Fig. 2.62. Scheme of the drive of the camshaft: 1 – cogged pulley of a bent shaft; 2 – cogged pulley of the pump of cooling liquid; 3 – tension roller; 4 – back protective cover; 5 – cogged pulley of the camshaft; 6 – gear belt; 7 – axis of a tension roller; And — an adjusting ledge on a back protective cover; In — a tag on a camshaft pulley; With — a tag on a cover of the oil pump; D — a tag on a pulley of a bent shaft

– turn a bent shaft for a bolt of fastening of a pulley of the drive of the generator clockwise in such situation that the tag on a flywheel (fig. 2.63) seen in the coupling case hatch was against average division of a scale. At the same time the tag In (see fig. 2.62) on a pulley of the camshaft has to be against an adjusting tag And on a back protective cover of a gear belt;
– turn a bent shaft for a bolt of fastening of a pulley of the drive of the generator counterclockwise in such situation that the tag In on a pulley of the camshaft moved from a tag And to two teeth down;
– check a belt tension: it is considered normal if in a middle part of a branch between pulleys of distributive and cranked shaft the belt twists on 90 ° by effort of fingers of 15-20 N (1,5–2 kgfs). For check of a tension it is possible to use devices 67.7834.9525 or 67.7834.9526 with a calibrated spring;
– if the effort is lower (above) norm, turn a bent shaft clockwise before combination of tags And yes In, weaken a nut of fastening of a tension roller, turn it on 10-15 ° against (or on) an hour hand and tighten a nut of fastening of an axis;
– again turn a bent shaft clockwise on two turns before combination of tags And yes In, then counterclockwise to tag shift In on a camshaft pulley on two teeth from a tag down And yes check a belt tension;
– if the tension is not enough, then repeat operations on a belt tension;
– if a tension normal, then tighten a nut of fastening of a tension roller the moment of 39,2 N · m (4 kgfs · l) also establish a forward protective cover of a gear belt.
Avoid an excessive tension of a belt as it considerably reduces the term of its service, and also bearings of the pump of cooling liquid and a tension roller.
After completion of adjustments check an inhaling of a bolt of fastening of a pulley of the drive of the generator on cranked to a shaft the moment of 102,9 N · m (10,5 kgfs · м).

       PREVENTION
At a tension of a belt it is not allowed to turn a bent shaft rotation of a pulley of the camshaft.