Mazda 626

1991-1998 of release

Repair and car operation

Mazda 626

+ 1. Maintenance instruction
+ 2. Maintenance
- 3. Engines
   + 3.1. Petrol engines (1,6 and 1,8 liters)
   + 3.2. Petrol 4-cylinder engine (2 liters)
   + 3.3. Petrol V6 engine (2,5 liters)
   + 3.4. Partition of engines (1,6 and 1,8 liters)
   - 3.5. Partition of engines (2,0 and 2,5 liters of V6)
      3.5.1. Introduction
      + 3.5.2. Technical characteristics
      3.5.3. Repair work without engine dismantle from the car
      + 3.5.4. Major maintenance of the engine
      3.5.5. Check by means of a vacuum measuring instrument
      3.5.6. Compression check
      3.5.7. Methods of dismantle of the engine
      3.5.8. Removal and engine installation
      3.5.9. Engine partition
      3.5.10. Partition and check of a head of cylinders
      3.5.11. Valves
      3.5.12. Assembly of a head of cylinders
      3.5.13. Removal of pistons and rods
      3.5.14. Removal of a cranked shaft
      3.5.15. Check of the block of cylinders
      3.5.16. Honingovaniye of cylinders
      3.5.17. Check of pistons and rods
      3.5.18. Check of a cranked shaft
      3.5.19. Check and selection of radical bearings and bearings of rods
      3.5.20. Check of camshafts and pushers
      3.5.21. Engine assembly order
      3.5.22. Installation of piston rings
      3.5.23. Installation of a cranked shaft
      3.5.24. Installation of a back epiploon of a cranked shaft
      3.5.25. Installation of pistons and rods
   + 3.6. Diesel engine of 2,0 liters
   + 3.7. Systems of electric equipment of the engine
+ 4. Heating and ventilation
+ 5. Fuel system
+ 6. Exhaust system
+ 7. Transmissions
+ 8. Coupling and semi-axes
+ 9. Brake system
+ 10. Running gear
+ 11. Body
+ 12. Electric equipment
+ 13. Electroschemes
+ 14. Good advice

3.5.17. Check of pistons and rods

PERFORMANCE ORDER

1. Remove piston rings by means of the tool for installation of piston rings, try not to scratch the piston.
2. By means of a wire brush or a small emery paper clean a piston head from deposits.

3. Clean flutes of piston rings by means of the special tool or a slice of the broken piston ring.
4. After removal of all deposits clear pistons and rods solvent and dry up them.
5. If pistons and walls of the cylinder are worn-out not strongly and cylinders were not chiseled, it is not required to establish new pistons.
6. Carefully examine all pistons on existence of cracks on a skirt of the piston and on a surface round a shatunny finger.
7. Examine pistons on existence of scratches, задиров, the scorched areas or corrosion.
8. If the skirt of the piston is strongly scratched, the reason is the overheat or abnormal combustion of a fuel mix. In this case it is necessary to check carefully systems of greasing and engine cooling. Hole existence in a head of the piston indicates abnormal combustion of a fuel mix (there is its premature ignition). The bad fuel mix, the wrong installation of a corner of an advancing of ignition, malfunction in final system can be the reasons leak from an inlet collector.
9. Corrosion spots on the piston mean that cooling liquid proceeds in the combustion chamber.
	10. Measure lateral gaps of piston rings. If the gap exceeds admissible limits, it is necessary to replace the piston.
	11. Measure a gap between the piston and the cylinder, for this purpose measure diameter of the piston perpendicular to a piston finger and measure diameter of the cylinder. Take away diameter of the piston from diameter of the cylinder. If the gap exceeds admissible limits, the cylinder it is necessary to chisel and establish the new piston and new piston rings.
12. Check a gap between the piston and a rod.
13. Examine rods on existence of cracks and other damages. For more detailed checking of pistons and rods address to experts.
14. Measure length of a carving of bolts of rods. In four-cylinder engines of a carving of bolts 45 mm should be not longer, and in six-cylinder engines 48 mm are not longer, otherwise it is necessary to replace bolts.