Mazda 3 since 2003
1. Operation and maintenance of the car
2. Engine
2.1. General description of new engines of the L8, LF and L3 models
2.2. Mechanical part of engines
2.2.1. Engines of the L8 and LF models
2.2.2. Verification of the contents of CO/CH in the fulfilled gases
2.2.3. Measurement of a compression in engine cylinders
2.2.4. Check of a belt of the drive of auxiliary units
2.2.5. General information and safety measures at removal of the power unit
2.2.6. Removal of sealant
2.2.7. Removal and installation of the power unit
2.2.8. Check of the executive mechanism of change of phases of gas distribution (L3)
2.2.9. Removal and installation of the executive mechanism of change of phases of gas distribution (L3)
2.2.10. Gas distribution mechanism drive chain
2.2.11. Removal and installation of the operating oil valve (OCV) (L3)
2.2.12. Check of the operating oil valve (OCV) (L3)
2.2.13. Check of operation of the spool-type valve (OCV) (L3)
2.2.14. The general repair operations on the power unit
2.2.15. Check of a head of the block of cylinders
2.2.16. Assembly of the block of cylinders (beginning)
2.2.17. Assembly of the block of cylinders (termination)
2.2.18. Assembly of a head of the block of cylinders
2.2.19. Assembly of the drive of the mechanism of gas distribution
2.3. Appendix 1
2.4. Appendix 2
2.5. Appendix 3
2.6. The Z6 engine – a mechanical part
2.7. Lubrication system
2.8. Cooling system
2.9. System of an admission
2.10. Fuel system
2.11. System of production of the fulfilled gases and system of decrease in toxicity
2.12. System of ignition
2.13. Control system
2.14. Tables
3. Transmission
4. Running gear
5. Steering mechanism
6. Brake system
7. Onboard electric equipment
8. Body
 








2-2-3-izmerenie-kompressii-v-cilindrakh-dvigatelya.html

2.2.3. Measurement of a compression in engine cylinders

NOTE
Measurement of a compression in cylinders of the engine is recommended to be performed in the following cases: deceleration of power of the engine, the raised consumption of engine oil, the increased fuel consumption.

Warm up the engine up to the normal working temperature, stop it and wait 10 min.
Remove coils of spark plugs
Turn out all spark plugs from heads of the block of cylinders.

Установка компрессометрах
Fig. 2.73. Installation kompressometra


Insert a tip of a kompressometr into a candle opening of a head of the block of cylinders and measure a compression in cylinders of the engine (fig. 2.73).
Completely open a butterfly valve.
Consider indications of a kompressometr when scrolling a bent shaft of the engine a starter.

NOTE
At measurement of a compression the rechargeable battery has to be completely charged as it is necessary for correct measurement that the frequency of rotation of a bent shaft of the engine made not less than 300 min.-1.

Repeat operation of measurement for each cylinder.

NOTE
Duration of measurement of a compression in each cylinder has to be as little as possible.

Compression size for L8 model engines:
- standard – 1750 kPa (17,855 kg/cm2);
- minimum admissible – 1225 kPa (12,492 kg/cm2).
The difference of the measured values of a compression on engine cylinders (for the serviceable engine) has to make no more than 196,1 kPa (1,99 kg/cm2).
Compression size for LF model engines:
- standard – 1720 kPa (17,539 kg/cm2);
- minimum admissible – 1204 kPa (12,277kg/cm2).
The difference of the measured values of a compression on engine cylinders (for the serviceable engine) has to make no more than 196,1 kPa (1,99 kg/cm2).
Compression size for L3 model engines:
- standard – 1430 kPa (14,581 kg/cm2);
- minimum admissible – 1000 kPa (10,197kg/cm2).
The difference of the measured values of a compression on engine cylinders (for the serviceable engine) has to make no more than 196,1 kPa (1,99 kg/cm2).
If in one or several cylinders the size of a compression is lower than minimum admissible, fill in in the cylinder through a candle opening a small amount of engine oil and repeatedly measure a compression in these the cylinder.
If after in the cylinder oil was filled in, the size of a compression increased, then, most likely, wear or damage of piston rings or walls of the cylinder takes place.
If after in the cylinder oil was filled in, the size of a compression did not change, then, most likely, lag of the valve or its leaky landing in a saddle, or leak through laying of a head of the block of cylinders takes place.
Establish to the place of a spark plug.
Establish to the place of the coil of spark plugs.

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2.2.4. Check of a belt of the drive of auxiliary units