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


3.5.2.2. 6-cylinder engines

GENERAL INFORMATION

Diameter of the cylinder
83 mm
Piston stroke
73 mm
Volume
2,5 liters
Compression pressure in the cylinder at 250 rpm:
  – nominal
203 psi
  – minimum
142 psi
Oil pressure (the engine is warmed):
  – 1000 rpm
28 psi
  – 3000 rpm
49 – 71 psi
Head of cylinders
Maximum admissible deformation
0,098 mm
Valves and springs of valves
Valve border width:
  – inlet
0,888 mm
  – final
0,985 mm
Diameter of a rod of the valve:
  – inlet
5,878 – 5,890 mm
  – final
5,872 – 5,885 mm
Gap between a rod of the valve and the directing plug:
  – inlet
0,025 – 0,058 mm
  – final
0,030 – 0,063 mm
Valve spring:
  – the maximum deviation from a right angle
1,6 mm
  – length in a free state:
     • inlet
43,3 mm
     • 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):
  – nominal
42,863 mm
  – minimum
42,667 mm
Free wheeling:
  – nominal
0,05 – 0,10 mm
  – maximum
0,14 mm
Beating
0,017 mm
Diameter of a pusher
29,488 – 29,503 mm
Gap between a pusher and walls of its nest:
  – nominal
0,245 – 0,065 mm
  – maximum
0,178 mm
Valve gap (only models of 1998)
  – inlet
0,243 – 0,310 mm
  – final
0,263 – 0,328 mm
Bent shaft and rods
Rod bearing:
  – diameter
52,108 – 52,120 mm
  – maximum conicity and ovality
0,05 mm
Lubricant gap of the bearing:
  – nominal
0,023 – 0,043 mm
  – the most admissible
0,08 mm
Side gap (free wheeling) of a rod:
  – nominal
0,175 – 0,325 mm
  – the most admissible
0,400 mm
Radical bearing:
  – diameter:
     • nominal
60,936 – 60,980 mm
     • minimum
60,965 mm
  – maximum conicity and ovality
0,005 mm
Lubricant gap:
  – nominal
0,038 – 0,055 mm
  – maximum
0,063 mm
Free wheeling of a bent shaft:
  – 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:
  – nominal
0,030 – 0,055 mm
  – maximum
0,128 mm
Trailer gap of a piston ring:
  – N1 (top) compression ring
0,150 – 0,295 mm
  – N2 (average) compression ring
0,250 – 0,375 mm
  – oil scraper ring
0,200 – 0,675 mm
Gap between a piston ring and a side surface of a flute of a ring:
  – N1 (top) compression ring
0,020 – 0,065 mm
  – N2 (average) compression ring
0,030 – 0,065 mm
  – maximum
0,15 mm

Moments of an inhaling, N. of m.

Bolts of a cover of the radical bearing:
  – a step 1 bolts And yes 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 lower half of the block to top *
19 – 20
Rod cover bolts:
  – 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.




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