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


3.5.2. 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
Compression pressure in cylinders:
  – nominal
171 psi
  – minimum
119 psi
The maximum admissible difference of pressure between cylinders
15 psi
Oil pressure (the engine is warmed) at 3000 rpm
57 – 71 psi
Head of cylinders
Maximum admissible deformation
0,05 mm
Valves and springs of valves
Valve border width:
  – inlet
1,08 mm
  – final
1,18 mm
Diameter of a rod of the valve:
  – inlet
5,875 – 5,890 mm
  – final
5,870 – 5,885 mm
Gap between a rod of the valve and the directing plug:
  – inlet
0,025 – 0,060 mm
  – final
0,075 – 0,162 mm
Valve spring:
  – the maximum deviation from a right angle
1,5 mm
  – length in a free state
36 – 43 mm
Camshafts and pushers of valves
Shaft cam height:
  – inlet
42,30 mm
  – 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
Beating
0,03 mm
Lubricant gap of the bearing:
  – 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:
  – nominal
0,025 – 0,065 mm
  – the most admissible
0,178 mm
Valve gap (only models of 1998)
0,225 – 0,290 mm
Bent shaft and rods
Rod bearing:
  – diameter
47,185 – 47,200 mm
  – maximum conicity
0,005 mm
  – maximum ovality
0,003 mm
  – lubricant gap (nominal)
0,013 – 0,38 mm
Side gap (free wheeling) of a rod:
  – nominal
0,108 – 0,258 mm
  – the most admissible
0,30 mm
Radical bearing:
  – diameter
50,55 – 50,73 mm
  – maximum conicity
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 bent shaft:
  – 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:
  – nominal
81,69 – 81,71 mm
  – the most admissible conicity 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:
  – nominal
0,038 – 0,050 mm
  – maximum
0,15 mm
Trailer gap of a piston ring:
  – compression rings:
     • nominal
0,15 – 0,30 mm
     • maximum
0,50 mm
  – Oil scraper ring:
     • nominal
0,2 – 0,7 mm
     • maximum
0,875 mm
Gap between a piston ring and a side surface of a flute of a ring (only compression rings):
  – nominal
0,035 – 0,065 mm
  – 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 the strengthening section of the block of cylinders
19 – 24



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