Toothed drive belt with automatic regulator — removal, installation and adjustment (Opel Vectra A)

Removal

1. The actions are similar to those described in Chapter 4, except that the tensioning mechanism pulley has an automatic adjuster, which simplifies the procedure.

2. To loosen the belt tension before removing it, slightly loosen the tensioner pulley mounting bolt. Then insert a large screwdriver (or a suitable tool) into the groove on the tensioner lever, turn the lever until the belt is slack. Lightly tighten the mounting bolt to hold the tensioner in this position.

Installation

3. To install the timing belt, first check that the coolant pump is positioned correctly, the lug on the pump flange should be aligned with the corresponding lug on the cylinder block. If this is not the case, slightly loosen the pump mounting bolts and move it in the appropriate direction. Tighten the bolts to the specified tightening torque Specifications (see section 3).

4. Install the toothed drive belt as described in Chapter 4, then adjust the tension as follows.

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Adjustment

5. Loosen the tensioner pulley mounting bolt, move the mechanism lever until the pointer rests against the stopper. Tighten the tensioner pulley mounting bolt to hold it in this position.

6. Rotate the crankshaft two full revolutions in the normal direction of rotation. The TDC mark on the crankshaft pulley should align with the pointer on the rear cover of the toothed drive belt, the TDC marks on the camshaft sprockets should align with the notches in the camshaft cover.



7. Loosen the tensioner pulley mounting bolt again, move the tensioner lever clockwise until the pointer aligns with the notch in the mechanism. The new belt will be subject to "break-in" for the first few hours of operation (known as the break-in procedure). If you are installing a previously used belt (already "run in"), set the pointer approximately 4 mm to the left of the notch, using the Chapter 14, Section 2A. Tighten the tensioner pulley mounting bolt. Rotate the crankshaft one full revolution in the normal direction of rotation - the timing marks on the crankshaft and camshaft should remain aligned. Then install all remaining components as described in Chapter 4.

8. Once the belt is adjusted in this way, the correct tension will always be maintained automatically and no further monitoring or adjustment is required.