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


3.5.10. Partition and check of a head of cylinders

GENERAL INFORMATION

Prevention

Special tools and details which at you can not be are necessary for carrying out a partition and check of a head of cylinders. Therefore if you the fan, then will be much more economical to buy a new head, than to spend time for a partition and repair of old.


Partition

PERFORMANCE ORDER
1. Remove a head of cylinders, camshafts and pushers of valves.
2. Before removing valves prepare the separate numbered bags to put in them valves and details corresponding to them.
3. Squeeze a spring of the first valve and remove clamps flat-nose pliers. Remove a plate springs, a spring and a saddle of a spring.
4. Get the valve from a head and take a valve rod epiploon from the directing plug. If the valve does not pass through the directing plug, smooth out edges of the end of a rod of the valve an emery paper.
5. Do similar procedures with other valves.
6. After you sorted a head, it needs to be cleaned and checked.

Cleaning

PERFORMANCE ORDER
1. Clean off all traces of old laying from surfaces of a head and wipe it with solvent.
2. Clean the deposits formed in internal canals and openings of a head. If deposits of a rust blocked water channels of a head, address the expert.
3. By means of a suitable tap and compressed air clean carvings in openings of bolts of a head.
4. Brush a carving of adjusting pins of inlet and final collectors.
5. Wash out a head in solvent and dry up it.
6. Wash out valves and their elements in solvent. Dry up all details.

Check

Areas of check of valves

1. Valve emphasis

2. Flutes of clamps of a spring

3. Valve rod

4. Valve facet

5. Edge of the valve

6. Final valve

7. Inlet valve


PERFORMANCE ORDER
1. Examine a head on existence of cracks, traces of leak of cooling liquid and other damages. At detection of cracks, the head needs to be processed on the machine if damages too strong, a head it is necessary to replace.
2. By means of a ruler and the measuring probe check deformation of the joined head surfaces. If deformation exceeds admissible limits a head it is necessary to process in a specialized workshop.
3. Examine saddles of valves if they are damaged, address the expert.
4. Measure a gap between a rod of the valve and the directing plug by means of the measuring device. Instrument readings need to be divided into two and you receive gap size. If the gap exceeds admissible limits, the directing plug of the valve needs to be replaced.
Valves
5. Examine facets of valves on existence of wear, deformation, cracks, the burned sites and other damages. Check rods of valves for existence of the wiped sites and cracks. Check whether rods are bent. At detection of any damages valves need to be processed in a specialized workshop.
6. Measure width of an edge of the valve. If the received size is less than admissible limits, the valve needs to be replaced.
Valve elements
7. Examine springs of valves on existence of wear and damages. Measure length of springs. If length of any spring is less than limit specified in technical characteristics, replace it.
8. Check that springs were straight lines. If necessary replace the deformed springs.



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