Top dead center (TDC) of the piston of the first cylinder (Opel Vectra B)

The top dead center (TDC) of a piston is the point through which each piston passes as the crankshaft rotates. Each piston reaches the TDC position at the end of the compression stroke and again at the end of the exhaust stroke. The TDC of the piston of the first cylinder in the compression stroke is used to set the engine timing mechanism. Cylinder N1 is located on the toothed belt side.

1. Remove the ground cable from the battery and unscrew the spark plugs.

1.6L engines

2. To access the timing marks on the camshaft pulley, remove the upper timing belt cover.



3. Turn the engine crankshaft by the crankshaft pulley mounting bolt until the timing marks on the camshaft pulleys (A) are facing each other and aligned with the top of the cylinder head (B).

Engines 1.8 and 2.0 l

4. To access the timing marks on the camshaft pulleys, remove the upper timing belt cover.

(Material copied from this website: www.opelbook.ru)



5. Turn the engine crankshaft by the crankshaft pulley mounting bolt until the timing marks on the camshaft pulleys are in the upper position and aligned with the pointers on the cylinder head cover (1). Align the mark on the crankshaft pulley with the pointer on the housing (2).