5.8. Replacement of a belt of the drive of the gas-distributing mechanism and tension roller

Fig. 5.4. Scheme of the drive of the gas-distributing mechanism: 1 – cogged pulley of a bent shaft; 2 – gear belt; 3 – pulley of the water pump; 4 – tension roller; 5 – pulley of the camshaft of final valves; 6 – back protective cover of a gear belt; 7 – pulley of the camshaft of inlet valves; 8 – a ring (a synchronization disk) for the sensor of phases; 9 – basic roller; And – VMT tag on the cogged pulley of a bent shaft; In – an adjusting tag on a cover of the oil pump; With, F – adjusting tags on a back protective cover of a gear belt; D – an adjusting tag on a pulley of the camshaft of final valves; Е – an adjusting tag on a pulley of the camshaft of inlet valves

Camshafts are given to rotation from a pulley of 1 (fig. 5.4) of a bent shaft by means of the belt drive with a gear belt. Under pulleys of camshafts there are two rollers: at the left tension 4, on the right basic 9. At a basic roller the opening for fastening is executed on the center of an internal holder, at a tension roller it is located excentricly (it is displaced from the center on 6 mm). Therefore, turning a tension roller concerning a fastening bolt, it is possible to regulate a belt tension.
Pulleys of camshafts differ in the fact that the disk of synchronization 8 ensuring functioning of the sensor of phases is welded on a pulley of the 7th camshaft of inlet valves. In front and behind the drive is closed by plastic covers.
For installation of phases of gas distribution adjusting tags of A, D, E on pulleys, In on a cover of the oil pump, and also C and F on a back cover of a belt of the drive are provided. At correctly established phases the tag And has to coincide with a tag In, and tags of D and E — with tags of C and F.
Replace a camshaft drive belt if at survey you find:
– oil traces on any surface of a belt;
– wear tracks of a gear surface, a crack, undercuts, folds and peeling of fabric from rubber;
– cracks, folds, deepenings or cambers on an external surface of a belt;
– a razlokhmachivaniye or stratification on face surfaces of a belt.
It will be required to you: the tools necessary for removal of a belt of the drive of the generator and a forward cover of a belt of the drive of the gas-distributing mechanism, a key "on 15", a cap key "on 17", a special key for turn of a tension roller or a stripper of lock rings, an assembly shovel or the big screw-driver.
1. Disconnect a wire from the minus plug of the rechargeable battery.
2. Take off a generator drive belt (see. "Replacement of a belt of the drive of the generator").
3. Install the piston of the 1st cylinder in the provision of VMT (see. "Installation of the piston of the first cylinder in the provision of VMT of a step of compression").
4. Weaken a key "on 15" an inhaling of a bolt of fastening of a tension roller and turn a tension roller to weaken a belt tension.
5. Take off a belt from pulleys of camshafts, a tension roller and the cogged pulley of the water pump.
6. To turn off a bolt of fastening of a pulley of the drive of the generator, it is necessary to record a bent shaft from a provorachivaniye. For this purpose, having removed a cap in a coupling case, the assistant has to hold by means of an assembly shovel or the big screw-driver a bent shaft for flywheel wreath teeths.
7. Turn out a cap key "on 17" a bolt of fastening of a pulley of a bent shaft …
8. … take out it with a washer and remove a generator drive pulley from a bent shaft.
9. Remove a washer from a pulley of the drive of a belt of the gas-distributing mechanism.
10. Take off a belt of the drive of the gas-distributing mechanism from the cogged pulley of a bent shaft.
11. Before installation of a new belt clear pulleys and a tension roller of dirt and lubricant, degrease them white spirit.
12. Establish a camshaft drive belt as it should be, the return to removal. The pulley of the drive of the generator is established only in one situation. The groove of a pulley has to get on inflow of a pulley of the drive of the gas-distributing mechanism.
13. At installation of a belt provide a tension it to the leading branch.
14. After installation of a belt adjust its tension. For this purpose the special key or a stripper of lock rings inserted into grooves of an external disk of a tension roller turn a roller counterclockwise …
15. … before combination of a cut on an external disk with a rectangular ledge on the internal plug of a tension roller. Tighten a key "on 15" a bolt of fastening of a tension roller the moment recommended in the appendix 1.
If noise from a camshaft drive belt is heard, there is a probability that the bearing of a tension roller failed. Shoot a video, check operability of its bearing. If at a provorachivaniye of the bearing jamming, an axial side play is felt or lubricant effluence traces from the bearing are noticeable, replace a tension roller.
16. For replacement of a roller before installation of a belt finally turn out a bolt of its fastening and shoot a video.
17. Establish a new tension video as it should be, the return to removal. At the same time the roller disk with marking has to be directed outside.
18. Adjust a tension of a belt of the drive of the gas-distributing mechanism (see subitem 13-15).
19. Establish all removed details and knots as it should be, the return to removal.