General information
See Section SOHC Gasoline Engine Repair Procedures Without Removing Them From The Vehicle.
Procedure execution order
All engines
Bringing any of the pistons to the TDC position is done by turning the engine crankshaft.
When looking at the engine from the timing drive side, the normal direction of rotation of the crankshaft is clockwise.
Remember that attempting to turn the shaft counterclockwise may result in a disruption of the valve timing adjustments. The first is the cylinder on the outer side of the timing drive.
Disconnect the negative battery cable. To make it easier to turn the engine, remove all spark plugs.
To gain access to the TDC mark on the camshaft gears, remove the timing belt cover (see section Removal and installation camshafts).
Engines 1.0 and 1.2 l
1. Using a wrench placed on the crankshaft pulley mounting bolt, turn the latter in the direction of normal rotation so that the TDC mark (2) on the pulley is opposite the lug (1) on the timing belt housing.
Text copied from an online resource opelbook
TDC timing marks
2. When the conditions listed in the previous paragraph are met, the engine will be brought to the TDC position at the end of the compression stroke of the piston of the first cylinder.
Engines 1.4 and 1.6 l
1. Using a wrench placed on the crankshaft pulley mounting bolt, turn the latter in the direction of normal rotation until the camshaft gears are turned so that the timing marks (2) are aligned with each other and coincide with the upper edge of the cylinder head. The mark (3) on the rim of the crankshaft gear should be aligned with the mark (4) on the lower toothed belt cover.
TDC timing marks location diagram
2. When the conditions listed in the previous paragraph are met, the engine will be brought to the TDC position at the end of the compression stroke of the piston of the first cylinder.
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