Mazda 626

1991-1998 of release

Repair and operation of the car



Mazda 626

+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engines
+ 4. Heating and ventilation
- 5. Fuel system
   - 5.1. Nikki 30/34 carburetor
      5.1.1. Principle of work
      5.1.2. Identification
      5.1.3. General maintenance
      5.1.4. Adjustment of the carburetor
      5.1.5. Check of elements of the carburetor
      5.1.6. Diagnostics of malfunctions
   + 5.2. Power supply system (l engines 1,6 and 1,8)
   + 5.3. Power supply system (l engines 2,0 and 2,5)
+ 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


5.1.3. General maintenance

GENERAL INFORMATION

It is supposed that for carrying out maintenance the carburetor is removed from the car. However many operations can be performed, without removing the carburetor. In this case, uncover the carburetor and remove fuel from the float-operated camera, using pure napkins or soft fabric.

Nikki carburetor elements – model with the automatic air gate

1. Pump accelerator lever
2. A diaphragm of a butterfly valve – the secondary camera
3. Wax capsule and mechanism of opening of the air gate
4. Diaphragm of safety
devices of system of bystry idling
5. Carburetor cover
6. Float
7. Needle valve
8. Pump accelerator
9. Locking valve
10. Electromagnetic valve of system of increase in frequency of rotation of a bent shaft and switch of system of idling
11. Air and fuel jets
12. Pump accelerator spray small weight
13. The diffuser and an emulsion tube – primary camera
14. The diffuser and an emulsion tube – the secondary camera
15. Carburetor case
16. Case of throttles

Arrangement of jets

1. A jet of the transitional mode – the secondary camera
2. An air jet of the transitional mode – the secondary camera
3. The main air jet – the secondary camera
4. The main fuel jet – the secondary camera
5. Fuel jet of the concentrating device
6. The main fuel jet – primary camera
7. The main air jet – primary camera
8. An air jet of system of idling – primary camera
9. A fuel jet of system of a single hld – primary camera
10. An air jet of system of idling – primary camera

Window of the float-operated camera

Dismantling and check

PERFORMANCE ORDER
1. Remove the carburetor from the engine.
2. Examine the carburetor on existence of damages or wear tracks.
3. Disconnect a returnable spring of a butterfly valve.
4. Examine the pump accelerator lever on existence of wear tracks. Remove a fixing spring of the lever of the pump accelerator, a lock ring and a clip, and disconnect the lever together with a spring.
5. Remove a clip and disconnect a rod of the air gate.
6. Turn off fixing screws and uncover the carburetor. If it is not uncovered, knock on it with a rubber kiyanka. Do not try to wring out a carburetor cover by means of the screw-driver as you can damage the adjoining surfaces.
7. Examine the float-operated camera on existence of corrosion and traces of formation of a calcic raid.
8. Remove a spring of the final valve of the pump accelerator, a lock ring and a ball. Turn the carburetor and shake out these elements on a palm.
9. Turn off a copper cap and remove a small weight and a spring of the inlet valve of the pump accelerator. Turn the carburetor and shake out these elements on a palm.
10. Remove the pump accelerator piston together with consolidations from a carburetor cover. Check the pump piston for existence of wear tracks or damages.
11. Beat out a pin of a float and remove a float, the needle valve and laying of the float-operated camera.

Prevention

On some models the saddle of the needle valve is not removed.


12. By means of a ruler check whether flanges of a cover of the carburetor, case of the carburetor and case of throttles are deformed.
13. Check a tip of the needle valve for existence of wear tracks or jags.
14. Check a float for existence of damages and hit of gasoline in it; hit in a float of fuel can be checked if to shake a float. Or, lower a float in water and look whether there are no vials of air from it. Replace a float if it failed.
15. Check a float lever arm for deformation existence, and also check openings of installation of an axis of a float for existence of wear tracks or damages.
16. Replace a float axis if it is worn-out.
17. Unscrew the fuel interruption in supply valve (see subsection 5.1.5) and clear it by means of cleaner for cleaning of carburetors.
18. If you have a new consolidation and laying, turn off two screws and remove a window of the float-operated camera. Do not remove a window if you have no new consolidation.
19. Unscrew the mix adjustment screw. Examine a screw tip on existence of damages or jags.

Prevention

For removal of the screw of adjustment the special tool is necessary.


20. Note diameters of all fuel and air jets and the provision of their installation for the correct installation of these elements at assembly of the carburetor. At installation it is easy to mix jets.
21. If it is necessary, remove all fuel and air jets of primary and secondary camera of the carburetor.

Prevention

Use the short screw-driver not to damage jets.


22. Turn off two screws and remove diffusers. Remove an air jet of primary and secondary cameras and emulsion tubes from diffusers.
23. Unscrew the main fuel jet of primary camera and remove it from below the float-operated camera.
24. Remove a cap of the float-operated camera and unscrew the main fuel jet of the secondary camera from a nest on a wall of the float-operated camera.
25. Check calibration of jets, having compared their diameters to the values specified in the section of technical characteristics. It is possible that at the last partition jets were incorrectly established (or jets of incorrect diameters are established).
26. Check that openings of all jets were not worn-out, littered and did not get out of a round shape. Check that the channels connecting the float-operated camera to wells of emulsion tubes were pure.
27. Turn off and remove the valve of the concentrating device from the float-operated camera and check its work.
28. Check work of a plunger of the valve of the concentrating device installed in a carburetor cover.
29. Disconnect a rod of a butterfly valve of the secondary camera, having removed a fixing clip. Turn off fixing screws and remove a diaphragm from the carburetor case.
30. Press on a rod of a diaphragm of a butterfly valve of the secondary camera, close the vacuum channel a finger and release a rod. Replace a diaphragm if depression does not remain at least within 30 seconds
31. Turn off fixing bolts (one lower and two top) and remove the carburetor case from the case of throttles. Remember the provision of installation of the isolating block. By means of a ruler check existence of deformation on the adjoining surfaces.
32. Check a diaphragm of opening of a butterfly valve (see subsection 5.1.5), and also a damper of a butterfly valve (see subsection 5.1.5).
33. Check all vacuum hoses for existence of cracks and wear tracks.
34. Check the mechanism of the air gate for existence of wear tracks and ease of the course; process the jamming mechanism elements the corresponding aerosol. If elements of the mechanism continue to get stuck, replace them.
35. Clean jets, a cover of the carburetor and the case of throttles, the float-operated camera and internal channels. Carefully examine and clear all air openings and channels in a carburetor cover. Check internal channels of the carburetor, the gulf the clearing carburetor liquid in inlet openings, and having convinced that it follows from exhaust outlets. Wash out all channels of the carburetor the clearing carburetor liquid – it will help to clear them of dirt and a deposit. For cleaning of internal channels of the carburetor it is possible to use compressed air, but only when the carburetor is completely disassembled.

Prevention

Put on goggles during the work with compressed air, and also when using of the clearing carburetor liquid (if the channel of the carburetor is littered, the cleaning solution can scatter to you in a face).


Assembly

At assembly of the carburetor it is necessary to replace all laying. Also, replace the needle valve and the piston of the pump accelerator. Examine and (if it is necessary) replace a float pin, the screw of adjustment of mix and the main fuel jets. Replace the worn-out elements of connecting mechanisms, screws, springs and other worn-out elements.

Check that all jets were reliably twirled in the nests (but do not twist them too strongly). Poorly twirled jet can lead to education too rich (or even poor) fuel mix. Clean off traces of old laying from the adjoining surfaces and flanges of a cover of the carburetor and case of throttles and establish a cover into place, having put new laying. Do not use sealant on flanges or the adjoining surfaces of elements of the carburetor, and also at installation of the carburetor on the engine. If sealant gets to the canals passing through the carburetor, the carburetor can fail.

Check that fuel and air channels of halves of the carburetor were correctly combined.

PERFORMANCE ORDER
1. Collect the case of the carburetor and the case of throttles, having established between them new laying. Fix knots by means of fixing bolts.
2. Establish a diaphragm of a butterfly valve of the secondary camera and fix it by means of fixing screws. Establish fixing a clip on a diaphragm rod.
3. Twirl the valve of the concentrating device in the float-operated camera.
4. Twirl the main fuel jets in the nests (do not mix jets) and establish a cap of a drain opening with a new sealing washer.
5. Install emulsion tubes and air jets in diffusers, and install them on the places (do not mix diffusers).
6. Establish a jet of system of idling of primary camera, a cap and an air jet in the nests (do not mix elements).
7. Install the screw of adjustment of amount of mix of idling and a spring. Accurately twirl the screw against the stop (using the special tool if it is necessary), then turn off it on three whole revolutions – it will provide initial adjustment for start of the engine.

Prevention

Carving in a carburetor opening very thin therefore it is necessary to be very accurate not to twirl the screw with a distortion. If you damage a carving, the case of throttles will need to be replaced.


8. Establish a window of the float-operated camera (if it was removed) with new consolidation and laying.
9. Install the locking valve with a new sealing washer.
10. Establish a six-sided bolt banjo with new sealing washers and slightly twirl it.
11. Install new laying of the float-operated camera on the carburetor case. Note: As there are many modifications of Keihin carburetors, it is important to compare old and new laying carefully. Small difference between laying can lead to the fact that any of fuel or air channels it will be closed that will lead to deterioration in operation of the engine.
12. Replace a pin of the needle valve; establish a float and fix it by means of a pin.
13. Adjust height of installation of a float (see subsection 5.1.4).
14. Establish a small weight and a spring of the final valve of the pump accelerator and fix them by means of a cap.
15. Establish a ball of the inlet valve of the pump accelerator, a lock ring and a spring.
16. Install the pump accelerator piston with consolidations in a carburetor cover; replace consolidations if it is necessary.
17. Install a carburetor cover on the case of the carburetor and fix it by means of fixing screws. Twist screws gradually and in turn not to deform the surface of the case or a cover of the carburetor.
18. Connect a rod of the air gate and fix it by means of a clip.
19. Install the lever of the pump accelerator and fix it by means of a clip. Connect a returnable spring of the pump accelerator and a returnable spring of a butterfly valve.
20. Check smoothness and progressiveness of the movement of the air gate and connecting mechanism. Check that the connecting mechanism went easily and it was not worn-out.
21. Adjust opening of the air gate during the operation of the engine in the mode of bystry idling, at start and warming up of the engine (see subsection 5.1.4).
22. Install the carburetor on the engine.
23. Always check adjustment of frequency of rotation of a bent shaft during the operation of the engine in the mode of idling and amount of fuel mix of idling – it is desirable with use of the SO sensor – after carrying out any works on the carburetor. Operations of adjustment are described in subsection 5.1.4. If the carburetor completely understood, check all adjustments.



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