Toothed drive belt and tensioner mechanism (C16NZ2, 1.8 and 2.0 l) — removal, installation and adjustment (Opel Vectra A)

Removal

1. Since 1993, engines have been using a modified spring for the automatic tensioning mechanism of the toothed drive belt (see illustration). The assembly of the tensioner mechanism is similar to others, but the removal and installation procedures are different.



2. The main outer cover of the drive belt can be fixed to the rear cover either by brackets or hexagon head screws; in some cases, staples and screws are combined.

3. To relieve the belt tension before removing, loosen the tensioner mounting bolt slightly, then insert a tool into the groove on the tensioner lever, turn the tensioner lever until the drive belt is slack. If necessary, remove the tensioner completely and inspect it as described in Chapter 12.

Installation

4. Install the tensioning mechanism in place, lightly tighten the mounting bolt.

5. Make sure that the coolant pump is correctly positioned, i.e. the lug on the pump flange should be aligned with the corresponding lug on the cylinder block. If this is not the case, loosen the coolant pump mounting bolts and move the pump slightly in the desired direction (see Section 3). Tighten the bolts with the specified tightening torque Specifications.

6. Install the timing belt, then adjust its tension as follows.

Adjustment

7. Loosen the automatic tensioner mounting bolt, move the mechanism lever counterclockwise until the tensioner indicator hits the stopper. Tighten the mounting bolt to hold the mechanism in this position.

8. Rotate the crankshaft two full revolutions in the normal direction of rotation, and check that the TDC mark on the crankshaft pulley is aligned with the pointer on the rear toothed drive belt cover. The TDC mark on the camshaft sprocket should be aligned with the notch in the rear drive belt cover. Loosen the automatic tensioner mounting bolt, move the mechanism lever clockwise until the pointer is aligned with the notch in the tensioner bracket. The new belt will be bedded in for the first few hours of operation (running-in procedure). If you are installing a used belt (already tested), set the pointer approximately 4 mm to the left of the notch (see illustration).



9. Tighten the tensioner mounting bolt. Rotate the crankshaft one full revolution in the normal direction of rotation, and check that the timing marks on the crankshaft and camshaft remain aligned. Then install all remaining components as described in Chapter 12.



10. Once the timing belt has been adjusted in this way, the correct tension will always be maintained by the automatic tensioning mechanism and no further checking or adjustment is required.

Source is on the website (OpelBook.ru)