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


3.5.5. Check by means of the vacuum measuring instrument


Vacuum measuring instrument

Typical indications of the vacuum measuring instrument

1. Low constant pressure
2. The low changing pressure
3. Regular pressure jumps
4. Chaotic pressure jumps
5. Bystry vibration of an arrow
6. Strong fluctuations of pressure
7. Continuous pressure decline

Connect the measuring instrument to an inlet collector. Warm the engine and leave it to idle.

If the engine is serviceable, the measuring instrument has to show 17–22 inches, and the arrow has to twitch evenly.

If indications of the measuring instrument are lower necessary, then the following reasons are probable: laying between an inlet collector and the carburetor or a throttle proceeds, the vacuum hose proceeds, the corner of an advancing of ignition or an angle of rotation of the camshaft is not adjusted.

If indications of the measuring instrument are lower normal on 8 inches – laying of an inlet collector proceeds or the injector is faulty.

If the arrow through equal intervals falls 2 inches below than a normal mark – valves proceed.

If the arrow strongly unevenly twitches down – jams the valve or spark plugs are faulty.

Vibration of an arrow on four inches and exhaust gases – the directing plugs of valves are worn-out.

Bystry vibration at increase in turns of the engine – proceeds laying of an inlet collector or head, springs of valves are worn-out, valves are burned or candles are faulty.

Weak twitching of an arrow about a normal mark on 1 inch – problems with ignition.

Strong twitching of an arrow – laying of a head of cylinders is spoiled.

If the arrow slowly deviates on big pieces – fuel incorrectly mixes up, laying of an inlet collector or throttle proceeds.

Increase turns to 2500 and kill the engine, the arrow has to reduce almost to zero, then rise by 5 inches above a normal mark and come back to a normal mark.

If it does not occur, then piston rings are worn-out.

If there is a long delay – the exhaust system is littered.

On the homepage