4.4.1. Reduction of the piston of the first cylinder in the provision of the top dead point (TDP)
The Top Dead Point (TDP) is called the highest point of a piston stroke in the cylinder. Strictly speaking, in 4-stroke engines in the course of rotation of a bent shaft this situation is reached by each of pistons twice: once at the end of a step of compression and the second – at the end of a release step. At performing procedures of control and adjustment of the engine position of the piston of the first cylinder in VMT of the end of a step of compression is in most cases used.
Need for reduction of the piston in the provision of VMT arises when holding many procedures, in particular such as service of the valvate mechanism, removal and installation of the camshaft, GRM drive components, etc.
Make sure that transmission is transferred to neutral situation, then cock the parking brake, or prop up back wheels of the car antiretractable boots. Separate sockets of an electrical wiring of coils of ignition and turn out spark plugs (see the Section Check and replacement of spark plugs and the module of ignition).
Reduction of any of pistons in the provision of VMT is made by a provorachivaniye of a bent shaft of the engine in the normal direction of rotation by means of a face key with the ratchet drive (clockwise) for the bolt screwed in an end face of a forward pin of a bent shaft. In the presence of the assistant, the preliminary provorachivaniye of the engine can be carried out by a starter (short breakthroughs) from the driver's place under the leadership of the operator.
Installation of the piston of the first cylinder in the provision of VMT
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