4.5. Procedures of repair of petrol DOHC engines without their extraction from the car

Reduction of the piston of the first cylinder in the provision of the top dead point of a step of compression (VMT)

General information

See the Section of the Procedure of repair of petrol SOHC engines without their extraction from the car.

Order of implementation of the procedure

All engines

Reduction of any of pistons in the provision of VMT is made by a provorachivaniye of a bent shaft of the engine.

If to take a detached view of the engine of the GRM drive, the direction clockwise will be the normal direction of rotation of a bent shaft.

Remember that the attempt of a provorachivaniye of a shaft counterclockwise can lead to violation of adjustments of phases of gas distribution. The first is the cylinder, extreme from the GRM drive.

Disconnect a negative wire from the battery. For the purpose of simplification of a provorachivaniye of the engine turn out all spark plugs.

For the purpose of ensuring access to VMT tag on cogwheels of camshafts, uncover the GRM drive (see the Section Removal and installation of camshafts).

L engines 1.0 and 1.2

 PERFORMANCE ORDER

  1. By means of the key which is put on a bolt of fastening of a pulley of a bent shaft turn the last in the direction of normal rotation so that the tag of BMT (2) on a pulley stood opposite to inflow (1) on the GRM case.

Adjusting tags of VMT

  1. When performing of the conditions listed in the previous paragraph the engine will be given to a provision of VMT of the end of a step of compression of the piston of the first cylinder.

L engines 1.4 and 1.6

 PERFORMANCE ORDER

  1. By means of the key which is put on a bolt of fastening of a pulley of a bent shaft turn the last in the direction of normal rotation before deployment of cogwheels of camshafts adjusting tags (2) to each other and coincided with the top edge of a head of cylinders. The tag (3) on a rim of a cogwheel of a bent shaft at the same time has to be combined with a tag (4) on the lower cover of a gear belt.

Scheme of an arrangement of adjusting tags of VMT

  1. When performing of the conditions listed in the previous paragraph the engine will be given to a provision of VMT of the end of a step of compression of the piston of the first cylinder.