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


3.4.14. Check and cleaning of the block of cylinders


1. Examine the block on existence of cracks and traces of corrosion or a rust. Examine carvings of openings of the block. At detection of defects, the block needs to be repaired or replaced whenever possible.
2. Examine cylinders.
3. Measure diameter of the cylinder perpendicular to the central line (A) and parallel to the central line (B).
4. Measure diameter of the cylinder by the measuring instrument.
5. Measure measuring instrument length by a micrometer.
6. Measure diameter of each cylinder in the top, average and lower its parts, parallel to an axis of a bent shaft.
7. Measure diameter of each cylinder in top average and lower its parts, perpendicular to an axis of a bent shaft.
8. Conicity of the cylinder is calculated as a difference between the top and lower diameters. Ovality – as a difference between parallel and perpendicular measurements.
9. If the received results do not coincide with technical requirements, address experts.
10. By means of a ruler and probes check whether the surface of the block which is joined to a head is deformed.
11. Check wear of pistons and cylinders by means of probes. When finding wear or damages at survey of the block, address experts.


1. Remove soft caps from the block of cylinders. For this purpose by means of the hammer and a mandrel drown them in the block, and then get caps from openings, having picked up big flat-nose pliers.
2. Remove with the pallet all remains of material of laying from the block of cylinders, being careful not to damage a surface.
3. Uncover radical bearings and get bearings from the block and covers. Inscribe to what cylinder the bearing, and also a detail from which it was taken (from a cover or the block of cylinders), belongs, put them separately from each other.
4. By means of special face six-sided keys (Allen's key) turn out and remove all carving caps of channels of the block of cylinders.
5. If the engine is strongly polluted, then it should be handed over in a workshop of car service for washing with a strong stream or in the hot camera. Almost in all autoshops on sale there are brushes for a clearing of oil channels and openings. Wash out internal channels a stream of warm water until water does not become pure, carefully dry the block and oil the processed surfaces that will protect them from corrosion. If there is a compressed air, then blow the block and internal channels for drying process acceleration.
6. If the block is polluted slightly, then it is enough to wash out the block warm water with detergent and a rigid brush. Do not feel sorry for time and perform this work carefully. Irrespective of a way of washing very carefully clean oil channels and openings, dry the block and oil the processed surfaces.

7. Carving openings should be passed in the block a tap that will provide correctness of indications of the moment of an inhaling at assembly. Passing by a tap will allow to clear carving openings of dirt, traces of corrosion and the remains of sealant, and also to restore a carving. At an opportunity blow openings a stream of compressed air for removal of the remains of material from passing by a tap.
8. Carefully clear carvings of bolts of fastening of a head of the block of cylinders, and also covers of radical bearings.
9. Again establish covers of radical bearings, tighten bolts by hand.

10. Install new caps in the block, previously having greased them with high-temperature sealant. Be convinced of correctness of landing of caps, of lack of distortions. otherwise leaks are possible.
11. Landing of caps requires the special tool, however this operation can be executed with identical quality by means of a mandrel which diameter corresponds to a cap opening, and the hammer.
12. If assembly of the engine is not made at present, then cover the block of cylinders with a plastic cover that will protect it from pollution.

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