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
2.2.15.1. Check of the directing valve plug
2.2.15.2. Measurement of length of the valve
2.2.15.3. Measurement of diameter of a core of the valve
2.2.15.4. Measurement of internal diameter of the directing valve plug
2.2.15.5. Measurement of height of a vystupaniye of the directing valve plug
2.2.15.6. Replacement of the directing valve plug
2.2.15.7. A press fitting of the directing valve plug
2.2.15.8. Check and repair of a saddle of the valve
2.2.15.9. Check of a valvate spring
2.2.15.10. Check of a cam-shaft
2.2.15.11. Measurement of diameter of a neck of a cam-shaft
2.2.15.12. Measurement of a radial gap of a neck of a cam-shaft
2.2.15.13. Measurement of an axial gap of a neck of a cam-shaft
2.2.15.14. Check of a pusher of the valve
2.2.15.15. Check of the block of cylinders
2.2.15.16. Valve check of a maslorazbryzgivayushchy nozzle
2.2.15.17. Check of the piston
2.2.15.18. Check of a bent shaft
2.2.15.19. Measurement of size of a beating of a bent shaft
2.2.15.20. Measurement of diameters of necks of a bent shaft
2.2.15.21. Measurement of a radial gap in radical bearings of a bent shaft
2.2.15.22. Check of a side gap of a rod
2.2.15.23. Measurement of a radial gap of a rod
2.2.15.24. Check of bolts
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
 








2-2-15-17-proverka-porshnya.html

2.2.15.17. Check of the piston

ATTENTION
The piston, piston ring and rod do not understand usual practice. When replacing the piston the piston finger, a piston ring and a rod are replaced together as a uniform element.


Fig. 2.162. Measurement of diameter of the piston


Measure the outer diameter of each piston at right angle 90 ° to a piston finger 10,0 mm higher than the piston (fig. 2.162).
If diameter of the piston – is less than norm, replace the piston, a piston finger, a piston ring and a rod assembled.
Diameter of the L8 piston:
82,965–82,995 mm;
LF, L3, L3 (with the mechanism of change of phases of gas distribution):
87,465–87,495 mm.
Measure a gap between the piston and the cylinder.
If value does not meet standard, replace the piston, a piston finger, a piston ring and a rod assembled.
Normal gap: 0,025–0,045 mm.
Maximum gap: 0,11 mm.

Fig. 2.163. Measurement of a gap between a piston ring and a flute of a ring


Measure a gap between a piston ring and a flute of a ring on all circle of the piston (fig. 2.163).
If the gap exceeds maximum, replace the piston, a piston finger, a piston ring and a rod assembled.
Normal gap:
- top: 0,03–0,08 mm;
- the second: on 0,03–0.07 mm;
- oil scraper: 0,03–0.07 mm.
Maximum gap:
- top: 0,17 mm;
- the second, oil scraper: 0,15 mm.

Fig. 2.164. Measurement of a gap of a piston ring


Insert a piston ring into the cylinder and, pressing a ring the piston, displace it in the lower point. Measure a gap in the lock of each piston ring by the probe (fig. 2.164).
If the gap exceeds maximum, replace the piston, a piston finger, a piston ring and a rod assembled.
Standard gap:
- top: 0,16–0,31 mm;
- the second: 0,33–0,48 mm;
- oil scraper: 0,20–0,70 mm;
- maximum gap: 1,0 mm.

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2.2.15.18. Check of a bent shaft