Cars produced before 6/84
Remove the air filter.
Remove the camshaft cover, see p. 1.6.
Remove the clutch cover, see p. 9.1.
Remove the upper and lower timing belt guards.
Check the timing belt tension.
Set cylinder 1 to TDC. The marking on the flywheel should match the indicator on the clutch housing (Figure B4738).
The marking on the gear wheel of the injection pump must match the marking on the bracket.
Shine vacuum pump.
Instead of the pump, install KM-537, locking the camshaft in the TDC position; if there is no KM-537, then the adjustment can be made using a micrometer.
Note: KM-537 must be installed without tension, so as not to change the TDC position.
If the KM-537 tool is installed with voltage, it is necessary to adjust the position of the camshaft/camshaft wheel.
Remove the camshaft wheel, holding it with a wrench by the flats between the intake and exhaust cams of cylinder 4.
Lock the KM-537 camshaft. Turn the camshaft with a key so that the tool can be installed without tension.
Check that all TDC markings match, otherwise adjust.
Attention: The deviation of the flywheel mark from the pointer mark should not exceed ±1.0 mm.
Tighten the camshaft wheel screws to 90 Nm.
Remove KM-537
Check the rose adjustment again. To do this, turn the crankshaft 90° back and again to TDC.
Install the vacuum pump.
Check the timing belt tension, see p. 6.6.
Check the feed moment of the injection pump, see item 7.11.
Install the clutch cover.
Install the upper and lower timing belt guards.
Install and tighten the camshaft cover.
Install the air filter.
Adjusting the valve timing in cars manufactured after 6/84
Valve timing adjustment was previously performed by locking the camshaft with the KM-537 OPEL lock. Since June 1984, there are no more holes in the camshaft housing for installing the KM-537. It is not possible to lock the camshaft in this way.
Adjustment of valve timing is now performed using the KM-537 OPEL measuring bar and a micrometer.
If you don't have a measuring bar at hand, you can measure with a micrometer and a crossbar placed on the camshaft housing. This adjustment method can also be used on cars manufactured before June 1984.
Turn the crankshaft so that the marking on the flywheel coincides with the pointer on the clutch housing (photo). In this case, the piston of the 1st cylinder is at TDC, the valves of the 4th cylinder are overlapped.
The marking on the injection pump gear matches the marking on the water pump bracket (left photo).
Attention: Check the tension of the toothed belt using KM-510 A, adjust if necessary, see section 6.6.
Install the KM-238 measuring bar with a micrometer so that the micrometer leg ∅ 7-10 mm is at the base of the 2nd cam of the intake valve of cylinder 1. Set the micrometer to 0.
Move the micrometer together with the tire towards the top of the cam by 10 mm.
Using a 22mm wrench, turn the camshaft clockwise until the micrometer leg rises by 0.56mm.
While holding the camshaft in this position, tighten the wheel bolts to 90 Nm.
Check the adjustment again. Also check the adjustment of the injection pump. Adjust.
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