Subaru Legacy/Outback

1999-2003 of release

Repair and operation of the car



Subaru of Legasi, Autbek
+ Cars Subaru Legacy, Outback
+ Operation manual
+ Routine maintenance
- Engine
   Specifications
   Check of compression pressure in cylinders and tightness of the block
   Diagnostics of a condition of the engine with use of the vacuum gage
   The engine lubrication system - the general information
   - The repair procedures which are not connected with extraction of the engine from the car - four-cylinder engines
      Reduction of the piston of the first cylinder in situation VMT
      Check and adjustment of valvate gaps
      Removal and installation of a pulley of a cranked shaft
      Removal and installation of forward covers of the GRM drive
      Removal and installation of a belt of the GRM drive, check of a condition of components
      Removal, check of a state and installation of cogwheels of camshafts
      Removal and installation of a cogwheel of a cranked shaft
      Natyazhitel of a gas-distributing belt - the general information and the principle of functioning
      Removal, check of a state and installation of elements of the drive of valves
      Removal and installation of camshafts
      Removal and installation of heads of cylinders
      Removal and installation of the pallet of a case and maslozabornik
      Removal, service and installation of the oil pump
      Check of pressure of motive oil
      Removal and installation of the sensor switch of pressure of oil
      Removal, check of a state and installation of a flywheel / driving disk
      Replacement of support of a suspension bracket of the power unit
   + the repair Procedures which are not connected with extraction of the engine from the car - six-cylinder engines
   + General and capital repairs of engines
+ Cooling systems, heating
+ Power supply system and release
+ Electric equipment of the engine
+ Manual box and differential
+ Automatic transmission
+ Coupling
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment




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Natyazhitel of a gas-distributing belt - the general information and the principle of functioning

Design of an automatic natyazhitel of a belt of the GRM drive

1 — the Cuff
2 — the Compensation ring
3 — the Oil receiver
4 — the Returnable spring
5 — the Adjusting rod
6 — the Plunger
7 — an oil squeezing Chamber

8 — a plunger Spring
9 — the Control ball
10 — the Gas-distributing belt
11 — the Tension roller
12 — the Arm of a natyazhitel
13 — the Cylinder


General information

The design of an automatic natyazhitel of a belt of the GRM drive is shown on an illustration.

Adjusting assembly from the block of a natyazhitel and a basic arm. The device serves for automatic maintenance of effort of a tension of a belt at the certain level for the correct transfer as a belt of a torque, decrease in level of noise during the operation of the engine and increase in service life of elements of the GRM drive.

The adjusting rod, compensation ring, plunger, returnable spring and control ball are a part of the cylinder of a natyazhitel. The cavity of assembly is filled with silicone (kremniyorganichesky) oil.

The principle of functioning of a natyazhitel is described below.

Principle of functioning

When weakening effort of a tension of a belt the adjusting rod is wrung out by a returnable spring up, thus the oil which is in a cylinder receiver under pressure determined by the effort developed by a plunger spring pushes out a control ball and flows in a squeezing chamber. As a result pressure is supported to constants.

Under the influence of force of F developed by the moving-forward adjusting rod the torque in the direction counterclockwise is put to an arm of a natyazhitel. The tension roller which is developed together with an arm wrings out a belt with the effort of Pb generating force of reaction of a Tb belt and, - as a result, - force of reaction P in a point of application of effort of a rod of the regulator.

Under the influence of force P rod of a natyazhitel will be wrung out until there comes the total balance of force of F and effort developed by oil pressure in a squeezing chamber. As a result, the effort of a tension of a belt is supported to constants.

At excessive increase of effort of a tension of a belt force of P becomes more than force of F and oil gradually comes back from a squeezing chamber to a receiver until the demanded balance is reached.