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)
      3.4.1. Introduction
      3.4.2. Technical characteristics
      3.4.3. Repair work without dismantle of the engine from the car
      + 3.4.4. Capital repairs of the engine
      3.4.5. Checks of the engine
      3.4.6. Removal and installation of the engine
      3.4.7. Preparation for a partition
      3.4.8. Engine partition
      3.4.9. Partition and check of a head of cylinders
      3.4.10. Repair of valves
      3.4.11. Assembly of a head of cylinders
      3.4.12. Removal of pistons and rods
      3.4.13. Removal of a bent shaft
      3.4.14. Check and cleaning of the block of cylinders
      3.4.15. Honingovaniye of cylinders
      3.4.16. Check of pistons and rods
      3.4.17. Check of a bent shaft
      3.4.18. Check of radical bearings and bearings of rods
      3.4.19. Engine assembly order
      3.4.20. Installation of piston rings
      3.4.21. Installation of a bent shaft
      3.4.22. Installation of a back epiploon of a bent shaft
      3.4.23. Installation of pistons and rods
      3.4.24. Launch of the engine after repair and a running in
   + 3.5. Partition of engines (2,0 and 2,5 liters of V6)
   + 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


4295d568



3.4.10. Repair of valves
GENERAL INFORMATION

Because of complexity of works and need of use of special tools and the equipment, it is the best of all to charge repair of valves, saddles and guides of plugs to the skilled expert.

In house conditions performance of the following works is possible: dismantling of a head of the block of cylinders, its washing and check, repeated assembly and delivery in service of car service of the dealer or in specialized workshops for repair of valves.

In service of car service or in specialized workshops the following types of works are carried out: removal of springs and valves, grinding or replacement of valves and guides of plugs, check and replacement of springs, lock rings and crackers (as required), replacement of maslootrazhatelny caps, a partition of details of the valve, check of height of a spring in a free state. At a deviation from the plane exceeding norm, the head of the block is ground.

After performance of check and repair of valves and their details by skilled personnel, the head of the block of cylinders is completely restored. Before installation of a head of the block wash out it once again to remove the remains of abrasive material from grinding of a head or grinding in of valves. At an opportunity blow all channels and openings compressed air.

Check
PERFORMANCE ORDER
Valves
1. Carefully examine heads of valves, if necessary replace worn-out valves.
2. Measure valve head height over a facet, if necessary replace the valve.
Elements of valves
3. Examine springs of valves and measure length of everyone, if necessary replace a spring.
4. Check that springs were straight lines, if necessary replace all springs at the same time.
5. Examine saddles and plates of springs on existence of cracks and wear, if necessary replace them.

Grinding of valves

If facets of valves and a saddle have insignificant wear, or new valves on not worn-out saddles are installed, then valves need to be ground in to saddles. Operation of grinding in is carried out as follows.

PERFORMANCE ORDER
1. Apply a small amount of rough abrasive paste on a saddle facet.
2. Insert the valve into the directing plug and, turning and pressing the valve, grind in it to a saddle. Performance of this work requires adaptation in the form of a tube with the piece of a rubber hose inserted inside. Grinding in can be carried out also the electric drill, having inserted this device in a cartridge. In the course of grinding in periodically raise the valve for check of result and redistribution of pritirochny material.
3. When on a head of the valve or on a facet of a saddle the equal, continuous corbel is formed, remove the remains of rough abrasive paste and continue grinding in with fine paste.
4. After grinding in of all valves to saddles, carefully wash out kerosene of the place of grinding in for removal of the remains of an abrasive, wipe with rags and blow (at an opportunity) compressed air. The abrasive remains in a head of the block can cause the increased wear of details.

It should be noted that at excessive grinding in of old valves the arrangement of a corbel can be broken and become inadmissible, or if grinding in of new valves to old saddles is made, excessive grinding in can lead to formation of "pockets".