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



3.5.2.2. 6-cylinder engines

GENERAL INFORMATION

Diameter of the cylinder
83 mm
Piston stroke
73 mm
Volume
2,5 liters
Pressure of compression in the cylinder at 250 rpm:
  – the nominal
203 psi
  – the minimum
142 psi
Pressure of oil (the engine is warmed up):
  – 1000 rpm
28 psi
  – 3000 rpm
49-71 psi
Head of cylinders
Maximum admissible deformation
0,098 mm
Valves and springs of valves
Width of a border of the valve:
  – the inlet
0,888 mm
  – the final
0,985 mm
Diameter of a rod of the valve:
  – the inlet
5,878-5,890 mm
  – the final
5,872-5,885 mm
Gap between a rod of the valve and the directing plug:
  – the inlet
0,025-0,058 mm
  – the final
0,030-0,063 mm
Valve spring:
  – the maximum deviation from a right angle
1,6 mm
  – length in a free condition:
     • the inlet
43,3 mm
     • the final
46,2 mm
Camshafts and pushers of valves
Diameter of a neck of the bearing
Back block of cylinders:
  – N1:
     • inlet valve
29,502-29,528 mm
     • final valve
25,532-25,550 mm
  – N2, 3 and 4
25,502-25,525 mm
  – N5
25,532-25,550 mm
Forward block of cylinders:
  – N1:
     • inlet valve
25,502-25,550 mm
     • final valve
29,505-29,522 mm
  – N2, 3 and 4
25,502-25,525 mm
  – N5
25,502-25,550 mm
Lubricant gap of the bearing:
  – N1 and 5
0,04-0,08 mm
  – N2, 3 and 4
0,07-0,11 mm
Cam height (inlet and final valves):
  – the nominal
42,863 mm
  – the minimum
42,667 mm
Free wheeling:
  – the nominal
0,05-0,10 mm
  – the maximum
0,14 mm
Palpation
0,017 mm
Diameter of a pusher
29,488-29,503 mm
Gap between a pusher and walls of its nest:
  – the nominal
0,245-0,065 mm
  – the maximum
0,178 mm
Valve gap (only models of 1998 g)
  – the inlet
0,243-0,310 mm
  – the final
0,263-0,328 mm
Cranked shaft and rods
Rod bearing:
  – diameter
52,108-52,120 mm
  – maximum konusnost and ovality
0,05 mm
Lubricant gap of the bearing:
  – the nominal
0,023-0,043 mm
  – the most admissible
0,08 mm
Lateral gap (free wheeling) of a rod:
  – the nominal
0,175-0,325 mm
  – the most admissible
0,400 mm
Radical bearing:
  – diameter:
     • the nominal
60,936-60,980 mm
     • the minimum
60,965 mm
  – maximum konusnost and ovality
0,005 mm
Lubricant gap:
  – the nominal
0,038-0,055 mm
  – the maximum
0,063 mm
Free wheeling of a cranked shaft:
  – the nominal
0,08-0,28 mm
  – the most admissible
0,31 mm
Thickness of a persistent half ring
1,970-2,018 mm
Block of cylinders
Maximum admissible deformation of a surface of the block of cylinders
0,148 mm
Diameter of the cylinder
83,17-83,19 mm
Pistons, piston rings
Diameter of the piston (nominal)
83,125-81,525 mm
Gap between the piston and the cylinder:
  – the nominal
0,030-0,055 mm
  – the maximum
0,128 mm
Trailer gap of a piston ring:
  – N1 (top) kompressionny ring
0,150-0,295 mm
  – N2 (average) kompressionny ring
0,250-0,375 mm
  – maslosjemny ring
0,200-0,675 mm
Gap between a piston ring and a lateral surface of a flute of a ring:
  – N1 (top) kompressionny ring
0,020-0,065 mm
  – N2 (average) kompressionny ring
0,030-0,065 mm
  – the maximum
0,15 mm

Moments of an inhaling, N of m.

Bolts of a cover of the radical bearing:
  – a step 1 bolts And and In
23-26
  – a step the 2nd bolts With
18-20
  – step 3rd bolts And
Tighten for 80 °
  – a step the 4th bolts In
Tighten for 70 °
  – a step the 5th bolts With
Tighten for 60 °
  – a step the 6th bolts And, In and With
Repeat steps 3, 4 and 5
The bolts, fixing the bottom half of the block to верхней*
19-20
Bolts of a cover of a rod:
  – step 1
22-26
  – step 2
Tighten for 90 °

* See subsection 3.2.2 for additional information.

** Tighten only after tightened bolts of covers of radical bearings.