Saab 9-5

since 1997 of release

Repair and car operation

Saab 9-5
+ Saab 9-5 Cars
+ Governing bodies and operation receptions
+ Settings and routine maintenance of the car
- Engine
   General information and preparatory operations
   Check of kompressionny pressure
   Engine check by means of the vacuum gage
   + Repair of 4-cylinder petrol engines
   + Repair of 6-cylinder petrol engines
   + Repair of 6-cylinder diesel engines
+ Systems of cooling of the engine, heating, ventilation and air conditioning
+ the Power supply system and production of the fulfilled gases
+ Systems of electric equipment of the engine
+ Manual box of gear shifting
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment

Check of kompressionny pressure

For performance of procedure of check of kompressionny pressure the help of the assistant is required.

Measurement of kompressionny pressure allows to make general idea about current state of such internal components of the engine, as laying of heads of cylinders, elements of the klapanny mechanism, pistons and piston rings. The analysis of results of check allows to define, whether the engine needs major regenerative maintenance, or it is enough to replace only sealing laying of a head of cylinders. Measurement is made with the help компрессометра.


  1. Warm up the engine to normal working temperature (about the 80th hail.) also muffle it.
  2. Make sure of completeness of a charge of the storage battery.
  3. On petrol models turn out all spark plugs (see. Section Check and replacement of spark plugs and ignition module).
  4. Prepare компрессометр and screw its nozzle in a candle opening of one of cylinders.
  5. Completely open a butterfly valve and, turning the engine a starter, consider indications компрессометра. Write down result of measurement.

Time of carrying out measurement should be as it is possible more shortly.

  1. Repeat the procedures described in item 4 and 5 for remained cylinders of the engine.
  2. Compare results of measurement by requirements of Specifications.
  3. The compression grows in the serviceable engine very quickly. The low value shown after the first cycle, increasing with the subsequent cycles, indicates wear of piston rings. Low value after the first cycle, not increasing after the following, indicates existence of leaks via valves, or on the punched laying of a head of the cylinder (the crack in a head can be the reason also). To decrease in a compression can lead deposit existence on plates of valves.
  4. The results received at measurement of a compression, should be approximately identical to all cylinders. If pressure is in any cylinder at level minimum admissible and even below, for clarification of the reason pour in in the cylinder through a candle opening a teaspoon of impellent oil and repeat compression measurement.
  5. If oil addition temporarily improved a compression, the reason of its decrease, most likely, is wear of the piston, rings or the cylinder. If the increase in a compression did not occur, it is possible to assume that the reason – in a leakage of valves or the punched laying of a head of the block.
  6. The low compression in two next cylinders almost for certain is a consequence of breakdown of laying of a head. Availability of cooling liquid in chambers of combustion or in a case of the engine will confirm this assumption.
  7. If the compression in one of cylinders differs from the others more, to us on 2 atm, besides turns of idling are unstable, the reason, probably, excessive wear of a cam of a camshaft.
  8. After carrying out check disconnect компрессометр and establish acting in film components.

Features for the diesel engine

On the diesel engine компрессометр it is established in openings for a glow plug therefore previously execute described below operation.


  1. Separate the socket of nozzles.
  2. Remove from a turbokompressor the top section of the inlet pipeline with the MAF sensor.
  3. Remove the top cover of the engine.
  4. Disconnect from the inlet pipeline a delivery hose of a turbokompressor.
  5. Remove the top section of the inlet pipeline.
  6. Separate sockets of the EGR valve, the sensor of temperature of fuel and the sensor of absolute pressure.
  7. Remove toplivopodayushchy tubes of nozzles of cylinders 1, 3, 4 and 5.

Previously dump pressure in a power supply system.

  1. Give fixture of the returnable line of the back block of cylinders.
  2. Remove glow plugs (see. Head of System of electric equipment of the engine).