REPAIR MAINTENANCE OPERATION OF MOTOR VEHICLES
Mazda 626 (from 1991 to 1998, the year of issue)

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Mazda
	626
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			Carburetor Nikki 30/34
				Principle of operation
				Identification
				General Maintenance
				Adjusting the carburettor
				Check of elements of the carburettor
				Troubleshooting
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		Tips and Tricks

printable version

General Maintenance

It is assumed that for maintenance carburetor removed from the vehicle. However, many operations can be performed without removing the carburetor. In this case, remove the carburetor and remove the fuel from the float chamber, using a clean cloth or a soft cloth.

Elements of the carburettor Nikki - a model with automatic choke

1. Lever pump-accelerator
2. Aperture throttle - the secondary chamber
3. Wax capsule opening mechanism and the choke
4. The diaphragm safety
device system of fast idling
5. Cover the carburetor
6. Float
7. The needle valve
8. Pump Accelerator
9. Shut-off valve

10. The solenoid valve system to increase engine speed and a switch of system of idling
11. Air and fuel jets
12. The pump sprayer weights accelerator
13. The diffuser tube and emulsion - the primary chamber
14. The diffuser tube and emulsion - secondary chamber
15. The housing of the carburettor
16. The throttle body

Location jets

1. The transient speed jet - the secondary chamber
2. Air nozzle transient - the secondary chamber
3. Main air jet - the secondary chamber
4. The main fuel jet - the secondary chamber
5. jet fuel processing device

6. The main fuel jet - the primary chamber
7. The main air jet - the primary chamber
8. Air jet of system of idling - the primary chamber
9. The fuel nozzle system idle hlda - the primary chamber
10. Air jet of system of idling - the primary chamber

Window float chamber

Disassembly and inspection

PERFORMANCE ORDER

1. Remove the carburetor from the engine.
2. Inspect the carburetor for damage or signs of wear.
3. Disconnect the throttle return spring.
4. Inspect the pump lever-accelerator for signs of wear. Remove the retaining spring of the lever of the accelerator pump, retaining ring and clamp, and disconnect lever with spring.
5. Remove the clamp and disconnect the air damper rod.
6. Turn off fixing screws and remove the carburetor. If the cover is not removed, tap it a rubber mallet. Do not try to squeeze the carburetor cover with a screwdriver as you may damage the mating surfaces.
7. Inspect the float chamber for corrosion and traces of calcium plaque formation.
8. Remove the outlet valve spring accelerator pump, retaining ring and ball. Turn the carburetor and shake these items on hand.
9. Remove the brass cap and remove the sinker and the spring of the intake valve of the pump-accelerator. Turn the carburetor and shake these items on hand.
10. Remove the piston pump-accelerator with seals to cover the carburetor. Check the pump piston for signs of wear or damage.
11. Drive out the pin float and remove the float needle valve and float chamber gasket.
A warning On some models, the seat of the needle valve is not removed.
12. Using a ruler, check to see if the flange cover of the carburettor, the carburettor and the throttle case.
13. Check the tip of the needle valve for wear or nicks.
14. Check the float for damage and ingestion of a gasoline; Ingestion float fuel can be checked, if you shake the float. Or, lower the float into the water and see if there are air bubbles from it. Replace float if it is out of order.
15. Check the float arm bracket for deformation, as well as check the mounting holes axis of the float for signs of wear or damage.
16. Replace the float axis, if it is worn.
17. Remove the fuel cut valve (see. Subsection 5.1.5) and clean it with a cleaning agent to clean the carburetor.
18. If you have new seals and gaskets, remove the two screws and remove the float chamber window. Do not remove the window, unless you have a new seal.
19. Remove the screw adjustment of the mixture. Look at the tip of the propeller for damage or chipping.
A warning To remove the adjustment screws require a special tool.
20. Check the diameters of all the fuel and air jets and the position of their installation for proper installation of these elements in the assembly of the carburetor. When installing the jets are easily confused.
21. If necessary, remove all fuel and air jets primary and secondary chambers of the carburettor.
A warning Use a screwdriver to short in order not to damage the jets.
22. Remove the two screws and remove the cones. Remove the air jet of the primary and secondary chambers and emulsion tube diffusers.
23. Remove the main fuel jet of the primary chamber and remove it from the bottom of the float chamber.
24. Remove the plug of the float chamber and remove the main fuel jet of the secondary chamber of the nest on the wall of the float chamber.
25. Check the calibration of jets by comparing their diameters to the values specified in the technical data. It is possible that at the last bulkhead jets were improperly installed (or installed wrong jets diameters).
26. Make sure that all the holes are not worn nozzles, clogged and have not lost a round shape. Check that the channels connecting the float chamber with the wells emulsion tubes are clean.
27. Unscrew and remove the valve from the processing device of the float chamber and check his work.
28. Check the operation of the valve plug processing device mounted in the lid of the carburetor.
29. Remove the stem throttle secondary chamber by removing the retaining clip. Turn off fixing screws and remove the diaphragm from the carburettor.
30. Push the throttle rod aperture of the secondary chamber, close the vacuum port and release the finger stock. Replace the diaphragm when vacuum is not retained for at least 30 seconds
31. Turn off fixing bolts (one lower and two upper) and remove the case from the case of throttles of the carburettor. Note the installation position of the insulating block. Using a ruler, check for deformation on the contact surfaces.
32. Check the throttle aperture (see. Subsection 5.1.5), and the throttle damper (see. Subsection 5.1.5).
33. Check all the vacuum hoses for cracks or signs of wear.
34. Check the choke mechanism for signs of wear and ease of movement; Treat seize elements of the mechanism corresponding spray. If the elements of the mechanism continues to jam, replace them.
35. Clean the jets, the cover of the carburettor and throttle body, float chamber and internal channels. Carefully inspect and clean all the air holes and channels in the lid of the carburetor. Check the internal channels of the carburettor, the bay cleaning liquid into the carburetor inlets, and making sure that it follows from the outlets. Rinse all channels with cleaning fluid carburetor carburetor - this will help clean them of dirt and sediment. To clean the internal channels of the carburettor can use compressed air, but only if the carburetor is completely disassembled.
A warning Wear protective goggles when working with compressed air, as well as using a cleaning liquid carb (carburetor if the channel is blocked, the cleaning solution may spray you in the face).

Assembly

When assembling the carburetor replace all gaskets. Also, replace the needle valve and the pump piston boosters. Inspect and (if necessary) replace the pin float adjustment screw mixes and the main fuel jets. Replace worn elements connecting mechanisms, screws, springs, and the remaining elements wear.

Make sure that all nozzles are securely tightened in their nests (but do not tighten them too much). Mild hooked nozzle can lead to the formation of too rich (or poor) fuel mixture. Clean off with flange contact surfaces and cover the carburetor and choke body traces of the old gasket and replace the cover, placing a new gasket. Do not use sealant on the flange or the contact surfaces of elements of the carburettor, as well as when installing the carburetor to the engine. If the sealant gets into the channels passing through the carburetor, the carburetor can fail.

Make sure that the fuel and air passages carburetor halves are correctly aligned.

PERFORMANCE ORDER

1. Assemble the carburettor and throttle body by installing a new gasket between them. Attach the units with the help of the fastening bolts.

2. Set the throttle aperture of the secondary chamber and secure it with screws. Install the mounting clip on the diaphragm rod.

3. Tighten the valve processing device in the float chamber.

4. Replace the main fuel jets in their nests (not to be confused jets) and install the drain plug with a new sealing washer.

5. Install the emulsion tube and air nozzles in the diffusers, and put them into place (not to be confused diffusers).

6. Install the nozzle system of idling of the primary chamber, cover and air jet to their nests (not to be confused elements).

7. Install the screw adjusts the amount of idle mixture and spring. Gently tighten the screw to stop (using a special tool, if necessary), and then unscrew it for three full revolutions - it will provide the initial setting to start the engine.

A warning

The thread in the bore carburetor is very thin, so you must be very careful not to tighten the screw with a warp. If you damage the threads, the throttle body need to be replaced.

8. Replace the float chamber window (if it was shot) with the new seals and gaskets.

9. Install the shutoff valve with a new sealing washer.

10. Install the hex bolt, banjo with new sealing washers and tighten it slightly.

11. Install the new gasket on the body of the float chamber of the carburetor. Note: Since there are many versions of carburetors Keihin, it is important to carefully compare the old and new gaskets. The small difference between the gaskets can cause that some of the fuel or air channel is closed, resulting in deterioration of the engine.

12. Replace the needle valve pin; install a float and secure it with pins.

13. Adjust the height of the float installation (see. Subsection 5.1.4).

14. Install the small weight and the spring of the exhaust valve of the pump-accelerator and fasten them with plugs.

15. Install the ball inlet valve of the pump-accelerator, the snap ring and spring.

16. Establish the piston pump accelerator sealed in a cover of the carburettor; replace seals, if required.

17. Replace the cover on the carburetor carburetor body and secure it with screws. Tighten the screws and gradually turns to deform the shell or cover of the carburettor.

18. Connect the air damper rod and secure it with a clamp.

19. Set the accelerator lever pump and secure it with a clamp. Connect the return spring of the pump-accelerator and the throttle return spring.

20. Check for smooth and steady movement of the air damper and the connecting mechanism. Check that the connecting mechanism is easy to walk and has not been worn.

21. Adjust the opening of the choke when the engine is in a mode of fast idling, starting and warming up the engine (see. Subsection 5.1.4).

22. Install the carburetor on the engine.

23. Always check the adjustment of the engine speed when the engine is idling and the amount of the fuel mix of idling - preferably using a CO sensor - after any work on the carburetor. Operation adjustment described in section 5.1.4. If the carburetor is completely disassembled, check all adjustments.

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Adjusting the carburettor