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
         3.5.2.1. 4-cylinder engines
         3.5.2.2. 6-cylinder engines
      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



3.5.2. Technical characteristics

3.5.2.1. 4-cylinder engines

GENERAL INFORMATION

Diameter of the cylinder
82 mm
Piston stroke
90 mm
Volume
2,0 liters
Pressure of compression in cylinders:
  – the nominal
171 psi
  – the minimum
119 psi
The maximum admissible difference of pressure between cylinders
15 psi
Pressure of oil (the engine is warmed up) at 3000 rpm
57-71 psi
Head of cylinders
Maximum admissible deformation
0,05 mm
Valves and springs of valves
Width of a border of the valve:
  – the inlet
1,08 mm
  – the final
1,18 mm
Diameter of a rod of the valve:
  – the inlet
5,875-5,890 mm
  – the final
5,870-5,885 mm
Gap between a rod of the valve and the directing plug:
  – the inlet
0,025-0,060 mm
  – the final
0,075-0,162 mm
Valve spring:
  – the maximum deviation from a right angle
1,5 mm
  – length in a free condition
36-43 mm
Camshafts and pushers of valves
Height of a cam of a shaft:
  – the inlet
42,30 mm
  – the final
42,66 mm
Maximum admissible wear
0,15 mm
Diameter of a neck of the bearing
25,53-25,56 mm
Maximum ovality
0,003 mm
Palpation
0,03 mm
Lubricant gap of the bearing:
  – the nominal
0,035-0,080 mm
  – the most admissible
0,15 mm
Free wheeling
0,077-0,197 mm
Diameter of a pusher
29,48-29,50 mm
Gap between a pusher and walls of its nest:
  – the nominal
0,025-0,065 mm
  – the most admissible
0,178 mm
Valve gap (only models of 1998 g)
0,225-0,290 mm
Cranked shaft and rods
Rod bearing:
  – diameter
47,185-47,200 mm
  – maximum konusnost
0,005 mm
  – maximum ovality
0,003 mm
  – lubricant gap (nominal)
0,013-0,38 mm
Lateral gap (free wheeling) of a rod:
  – the nominal
0,108-0,258 mm
  – the most admissible
0,30 mm
Radical bearing:
  – diameter
50,55-50,73 mm
  – maximum konusnost
0,005 mm
  – maximum ovality
0,003 mm
  – maximum wear
0,03 mm
Lubricant gap (nominal):
  – N3 bearing (central)
0,030-0,055 mm
  – other bearings
0,023-0,050 mm
  – the most admissible
0,065 mm
Free wheeling of a cranked shaft:
  – the nominal
0,078-0,278 mm
  – the most admissible
0,295 mm
Block of cylinders
Maximum admissible deformation of a surface of the block of cylinders
0,05 mm
Diameter of the cylinder:
  – the nominal
81,69-81,71 mm
  – the most admissible konusnost and ovality of the cylinder
0,01 mm
Pistons, piston rings
Diameter of the piston
81,64-81,66 mm
Gap between the piston and the cylinder:
  – the nominal
0,038-0,050 mm
  – the maximum
0,15 mm
Trailer gap of a piston ring:
  – kompressionny rings:
     • the nominal
0,15-0,30 mm
     • the maximum
0,50 mm
  – Maslosjemnoye ring:
     • the nominal
0,2-0,7 mm
     • the maximum
0,875 mm
Gap between a piston ring and a lateral surface of a flute of a ring (only kompressionny rings):
  – the nominal
0,035-0,065 mm
  – the maximum
0,083 mm

Moments of an inhaling, N of m.

Bolts of covers of radical bearings:
  – step 1
18-22
  – step 2
Tighten for 90 °
Nuts of covers of rods:
  – step 1
22-26
  – step 2
Tighten for 90 °
Bolts of strengthening section of the block of cylinders
19-24