Mazda 626

1991-1998 of release

Repair and operation of the car

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 dismantle of the engine from the car
      + 3.5.4. Capital repairs of the engine
      3.5.5. Check by means of the vacuum measuring instrument
      3.5.6. Check of a compression
      3.5.7. Methods of dismantle of the engine
      3.5.8. Removal and installation of the engine
      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 bent 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 bent 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 bent shaft
      3.5.24. Installation of a back epiploon of a bent shaft
      3.5.25. Installation of pistons and rods
   + 3.6. Diesel engine 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 half shafts
+ 9. Brake system
+ 10. Running gear
+ 11. Body
+ 12. Electric equipment
+ 13. Electrical circuitries
+ 14. Useful tips


3.5.17. Check of pistons and rods

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 piece 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, new pistons are not required to be installed.
6. Carefully examine all pistons on existence of cracks on a skirt of the piston and on a surface around a conrod finger.
7. Examine pistons on existence of scratches, zadir, the burned areas or corrosion.
8. If the skirt of the piston is strongly scratched, the overheat or abnormal combustion of fuel mix is the reason. In this case it is necessary to check carefully lubrication systems and coolings of the engine. Existence of a hole in a head of the piston indicates abnormal combustion of fuel mix (there is its premature ignition). Leak from an inlet collector, bad fuel mix, the wrong installation of a corner of an advancing of ignition, malfunction in final system can be the reasons.
9. Corrosion spots on the piston mean that cooling liquid proceeds in the combustion chamber.
10. Measure side gaps of piston rings. If the gap exceeds admissible limits, the piston needs to be replaced.
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 needs to be chiseled and installed 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 experts.
14. Measure length of a carving of bolts of rods. In four-cylinder engines of a carving of bolts 45 mm have to be not longer, and in six-cylinder engines 48 mm are not longer, otherwise bolts need to be replaced.