Opel Astra, Zafira

Since 1998 of release

Repair and car operation



Opel Astra
+ Cars Opel Astra and Zafira
+ The operation manual
+ Routine maintenance
- The engine
   Specifications
   Check компрессионного pressure in cylinders
   Diagnostics of a condition of the engine with vacuum gauge application
   - Procedures of repair of petrol engines SOHC without their extraction from the car
      Reduction of the piston of the first cylinder in position of the top dead point of a step of compression (ВМТ)
      Removal and cover installation газораспределительного the mechanism
      Removal and installation of a pulley of a cranked shaft
      Removal and installation of a cover of drive ГРМ
      Removal and installation of a belt of drive ГРМ
      Removal and installation натяжителя газораспределительного a belt and cogwheels of drive ГРМ
      Replacement of an epiploon of a camshaft
      Removal, check of a condition and installation of a camshaft from the case газораспределительного the mechanism
      Removal, check of a condition and installation of components of a drive of valves
      Removal and installation of a head of cylinders
      Removal and pallet installation картера
      Removal, service and installation of the oil pump
      Removal, check of a condition and flywheel / installation приводного a disk
      Replacement of epiploons of a cranked shaft
      Check of a condition and replacement of support of a suspension bracket of the power unit
   + Procedures of repair of petrol engines DOHC without their extraction from the car
   + Procedures of repair of diesel engines of 1.7 l and 2.0 l without their extraction from the car
   + The general and engine major repairs
+ Systems of cooling, heating
+ The power supply system and release
+ Engine electric equipment
+ Manual transmission
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment



Procedures of repair of petrol engines SOHC without their extraction from the car

Reduction of the piston of the first cylinder in position of the top dead point of a step of compression (ВМТ)

The general information

As the top dead point (ВМТ) is called the highest point of a piston stroke in the cylinder. Strictly speaking, in 4-taktnyh engines in the course of rotation of a cranked shaft the given position is reached by each of pistons twice: once in the end of a step of compression and the second — in the end of a final step. At performance of options of phases газораспределения and installation of a corner of an advancing of ignition in overwhelming majority of cases position ВМТ of the end of a step of compression of the piston (usually the first cylinder) is used.

Necessity for reduction of the piston (it) in position ВМТ arises at carrying out of many procedures, in particular such, as removal / installation of camshafts, components of drive ГРМ and the ignition distributor.

Some engines are designed in such a manner that at проворачивании cranked or distributive (ых) shaft at removed газораспределительном a belt/chain there can be an input of valves in contact with the bottoms of pistons that is fraught with risk of damage of corresponding internal components, up to destruction of moulding of a head of cylinders.

Do not suppose change of position of shaft after belt removal!

Order of performance of procedure


The scheme of an arrangement of adjusting labels of cogwheels distributive (1) and cranked (2) shaft in position ВМТ of the end of a step of compression of the piston of the first cylinder

Reduction of any of pistons in position ВМТ is made by проворачивания a cranked shaft of the engine. If to take a detached view of the engine of drive ГРМ, the direction clockwise will be a normal direction of rotation of a cranked shaft. Remember that attempt проворачивания a shaft counter-clockwise can lead to infringement of adjustments of phases газораспределения. The first is the cylinder, extreme from outside drive ГРМ.

 PERFORMANCE ORDER

  1. Disconnect a negative wire of the accumulator. For the purpose of simplification проворачивания the engine turn out all spark plugs.
  2. For the purpose of providing of access to label ВМТ on a camshaft cogwheel, uncover drive ГРМ (Removal and installation of a cover of drive ГРМ see).
  3. By means of the key which has been put on a bolt of fastening of a pulley of a cranked shaft, turn last in a direction of normal rotation before combination of an adjusting label of a cogwheel of a camshaft with reciprocal риской from above on a back cover газораспределительного a belt. The label on a rim of a cogwheel of a cranked shaft thus should be combined with a label on the case of the oil pump (the Scheme of an arrangement of adjusting labels of cogwheels distributive (1) and cranked (2) shaft in position ВМТ of the end of a step of compression of the piston of the first cylinder see an illustration).

At performance of the listed conditions the engine will be resulted in position ВМТ of the end of a step of compression of the piston of the first cylinder.