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

Top dead center 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 on the toothed belt side. The engine crankshaft rotates clockwise when viewed from the right side of the car.

Removal

1. Remove the negative cable from the battery. Raise the front of the car and secure it on stands. Remove the right front wheel.

2. Remove the upper timing belt cover.



3. Turn the engine clockwise using a wrench on the crankshaft pulley. Rotate the crankshaft until the mark on the crankshaft pulley aligns with the pointer on the base of the oil pump.

4. To determine whether piston number one or number four is at top dead center, check the alignment of the mounting holes in the fuel pump pulley and camshaft pulley. When piston number one is at top dead center on the compression stroke, both pulley holes will line up with the bolt holes in the cylinder head.







5. When setting the piston of the first cylinder to TDC, if necessary, you can fix the pulleys of the fuel pump or camshaft, for which screw in the M6 bolt (photo on the left) through the camshaft pulley into the cylinder head and the M8 bolt (photo on the right) through the fuel pump pulley into the cylinder block.

[Article posted on a web portal: www.OPELBOOK.ru]