Remove clutch cover.
Rotate the crankshaft until the TDC marking is about 5 cm from the pointer.
Unscrew the central screw of the charge pump cover, See fig. below.
Do not remove the cold start accelerator rod.
Timing belt tension should be correct.
Instead of the central screw, screw in a micrometer with an OPEL KM-226 adapter and a sealing copper ring. Don't squeeze hard. Set the micrometer to 0.
Turn the crankshaft further until the marking on the flywheel aligns with the pointer. The micrometer should show 1.0±0.05 mm of piston stroke.
If the value is not reached, adjust. To do this, remove the toothed belt guard.
Unscrew the three screws on the pump drive wheel.
Adjust pump stroke. To do this, slightly turn the wheel hub using the KM-541 tool or a ring wrench by the central screw.
Lightly tighten the screws.
Check adjustment again. To do this, turn the crankshaft back by 90°.
Tighten the wheel screws after adjustment.
Screw in the central screw of the pump.
Caution: The sealing ring must always be replaced. Tightening force 15 Nm. For leaks, tighten no more than 25 Nm.
Fit toothed belt guard.
Install the clutch cover.
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