Top dead center (TDC) of the piston of the first cylinder

Top dead center (TDC) piston is the point through which each piston passes when cranking the crankshaft. Each piston reaches TDC at the end of the compression stroke, and then again at the end of the exhaust stroke. In order to install the engine timing mechanism, the TDC of the piston of the first cylinder is used. Cylinder #1 is on the timing belt side.



Remove the top casing of a gear belt of a drive Raise a forward part of the car and fix on supports.

Unscrew the mounting bolts, and remove the cover from the back of the crankshaft pulley.

Unscrew the mounting bolts, and remove the cover from the back of the crankshaft pulley. Turn the engine with a wrench by the crankshaft pulley until the alignment mark on the crankshaft pulley aligns with the TDC mark (0) on the cover of the gas distribution mechanism. As the mark on the pulley approaches, simultaneously the piston of cylinder No. 1 approaches the top of the cylinder.

In this position of the crankshaft, the pistons of cylinders 1 and 4 are in the upper position. To make sure the No. 1 cylinder piston is on the compression stroke, check that the mark on the camshaft pulley is exactly aligned with the TDC mark on the front side of the cylinder head. If the pointer is not aligned, turn the crankshaft pulley one full turn until the alignment marks line up (see Figure 2B.3. 2B.4).






After setting the 1st cylinder piston to TDC on the compression stroke, install the crankshaft pulley cover, lower the vehicle, and install the top timing belt cover.