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Valve timing adjustment was previously performed by locking the camshaft with the KM-537 OPEL locker. Since June 1984, there are no more holes in the camshaft housing for installing the KM-537. It is not possible to block 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 take the measurement using a micrometer and a crossbar placed on the camshaft housing. This adjustment method can also be used on vehicles produced 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 cylinder 1 is at TDC, the valves of cylinder 4 are closed.
The marking on the gear wheel of the injection pump matches the marking on the pump bracket (photo).
Attention! Check the tension of the toothed belt using KM-510 A, adjust if necessary.
Install the KM-238 measuring bar with a micrometer so that the 0 7-10 mm micrometer leg is at the base of the 2nd intake cam of the 1st cylinder. Set the micrometer to 0.
Move the micrometer together with the tire towards the top of the cam by 10 mm.
Using a 22 mm wrench, turn the camshaft clockwise until the micrometer leg rises 0.56 mm. Also see Figure B3528.
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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