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)
      3.4.1. Introduction
      3.4.2. Technical characteristics
      3.4.3. Repair work without dismantle of the engine from the car
      + 3.4.4. Capital repairs of the engine
      3.4.5. Checks of the engine
      3.4.6. Removal and installation of the engine
      3.4.7. Preparation for a partition
      3.4.8. Engine partition
      3.4.9. Partition and check of a head of cylinders
      3.4.10. Repair of valves
      3.4.11. Assembly of a head of cylinders
      3.4.12. Removal of pistons and rods
      3.4.13. Removal of a bent shaft
      3.4.14. Check and cleaning of the block of cylinders
      3.4.15. Honingovaniye of cylinders
      3.4.16. Check of pistons and rods
      3.4.17. Check of a bent shaft
      3.4.18. Check of radical bearings and bearings of rods
      3.4.19. Engine assembly order
      3.4.20. Installation of piston rings
      3.4.21. Installation of a bent shaft
      3.4.22. Installation of a back epiploon of a bent shaft
      3.4.23. Installation of pistons and rods
      3.4.24. Launch of the engine after repair and a running in
   + 3.5. Partition of engines (2,0 and 2,5 liters of V6)
   + 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


3.4.5. Checks of the engine


Check by means of the vacuum measuring instrument
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.

Check of a compression

1. Disconnect system of ignition, having disconnected a wire of high voltage of system of ignition from an ignition distributor cover, and having grounded it on the block of cylinders.
2. Connect the device for measurement of a compression to a N1 cylinder spark plug opening.
3. Completely open a butterfly valve and scroll a bent shaft of the engine a starter. After one or two turns pressure of compression has to will increase to the maximum mark, and then to be stabilized. Write down the received result.
4. Carry out a similar inspection with other cylinders and write down the received indications.
5. Pressure in all cylinders has to be identical. The difference more than in 2 bars between any two cylinders means malfunction. In the serviceable engine pressure has to increase quickly. The small pressure of the first step which is gradually increasing at the subsequent steps indicates that piston rings are worn-out. Small pressure of the first step which does not increase at the subsequent steps indicates leak in valves or on the punched laying of a head. Deposits on the lower parts of valves can become the reason of a low compression also.
6. If when conducting check you have doubts, address skilled experts.
7. If pressure, in any cylinder too low, carry out the following inspection to establish the reason. Pour in a teaspoon of pure engine oil in the cylinder through an opening of a spark plug and repeat check of pressure.
8. If after oil addition pressure of compression increased, then it means that the piston or the cylinder is worn-out. If pressure did not increase, so the reason in the worn-out or burned valves or in the punched laying of a head of cylinders.
9. Low pressure in two next cylinders practically always means that between them laying of a head is punched.
10. If in one of cylinders pressure is about 20% lower, than in the others and the engine badly idles, it means that the reason, perhaps, the worn-out cam of the camshaft is.
11. If pressure too big, then, most likely, walls of combustion chambers are covered with coal deposits.
12. After completion of check screw in spark plugs on places and connect system of ignition.

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