The top dead point (ВМТ) is the highest point through which takes place the piston at engine work. Each piston reaches ВМТ in compression and release steps, but term ВМТ usually concerns the piston of the first cylinder in a compression step. The label on a pulley гасителя the fluctuations, fixed on cranked to a shaft, also concerns installation of the piston of the first cylinder in ВМТ in a compression step.
Installation of the piston of the first cylinder in ВМТ in a compression step – an essential part of process on replacement of pulleys and a drive chain газораспределительного the mechanism, and also on adjustment of a backlash of valves.
Installation of the piston of the first cylinder in ВМТ make in a following order:
– Before installation of the piston of the first cylinder in ВМТ switch off ignition and establish the gear change lever in neutral position;
– Put out of action ignition system, having disconnected electric sockets from ignition coils;
– For piston installation in ВМТ turn a cranked shaft clockwise if to take a detached view of the engine of a chain of a drive газораспределительного the mechanism. Turn a cranked shaft a key for the central bolt of fastening of a pulley to a cranked shaft;
– Turn out spark plugs and establish a tip компрессометра in an aperture for a spark plug of the first cylinder. The tip компрессометра should be rolled in an aperture for a candle and have length not less than 150 mm;
– Turn a cranked shaft clockwise and at approach of the piston of the first cylinder to ВМТ компрессометр will start to show pressure increase in the cylinder;
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Fig. 3.52. Label combination on гасителе fluctuations with sign ВМТ or 0 on a forward cover of a chain
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– Continue to turn a cranked shaft before label combination on
гасителе fluctuations with sign
ВМТ or 0 on a forward cover of a chain (
fig. 3.52).
If
компрессометр it is inaccessible, it is possible to close an aperture for a candle a finger and on pressure increase at
проворачивании a cranked shaft to define, when compression in the first cylinder begins. Further continue to turn a cranked shaft before label combination on
гасителе fluctuations with sign
ВМТ or 0 on a forward cover of a chain (
fig. 3.52 see
).
After installation of the piston of the first cylinder in ВМТ in a compression step, turning a cranked shaft on 180 , it is possible to establish other pistons in ВМТ in sequence corresponding to an operating procedure of cylinders.