lesson 8 for automotive

Remove the pipes include fuel line which supply to the carburetor, connecting tube to the OVCV, anti-pollution pipes7.. Remove the fuel float and carburetor chokeFigure 4.. Remove the th

STRUCTURE OF THE INTERNAL

COMBUSTION ENGINE

*Disassemble and inspect the carburetor

1 Disassemble process

1 Drain the coolant from the engine

2 Remove the air filter

3 Remove the throttle cable from the carburetor

4 Remove the cable from the automatic

transmission

5 Remove the electrical connector to

the carburetor

6 Remove the pipes include fuel line which supply

to the carburetor, connecting tube to the OVCV, anti-pollution pipes

7 Loosen the nuts evenly and remove the carburetor from the intake manifold

8 Use a cloth to cover the intake pipe

Figure 1 Remove the carburetor from the engine

2

2 Remove the carburetor cover

1 Remove the electrical terminals from the electrical connector

2 Remove the vacuum line to the CB unit

Figure 2 Remove the carburetor cover

3

Figure 3 Remove the fuel float and carburetor

choke

Figure 4 Remove the valves and carburetor circulator

4

Figure 5 Remove the throttle valve and throttle shaft

Figure 6 Remove diffuser throat and pump mechanism

5

Figure 8.7 Check fuel float and 3-sided valve

1 Observe and check floats and valves

2 Check piston movement

3 Check the opening and closing of the valve

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4 Check the solenoid valve:

- Use batteries to supply power to the solenoid valve

- Listen to the valve's jumping sound when the power is turned on and off

5 Check the heating coil of the automatic opening damper controller

- Resistance 1.7 - 1.9 at temperature 20 degree

Figure 8 Check idle valve and heating coil 7

6 Check the OVCV kit:

- Check the valve and valve seat

- Check the valve shaft movement check resistance

- Supply battery power to the two terminals of the valve

- Gently push the valve with your hand and check that the valve is tightly held

Figure 9 Check the 3-sided valve

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Figure 10 Check throttle and carburetor adjustment

Figure 11 Check the air dam Figure 12 Adjust idle sensitivity mode

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Figure 13 Check the intake valve Figure 14 Check the exit valve

Figure 15 Check the pump membrane 10

Figure 16 Electronic fuel injection system diagram

1-fuel tank; 2-electric fuel pump; 3-fuel filter; 4-distribution system; 5-fuel pressurization; 6-ECU; 7-main nozzle; 8-cold start injector; 9-screw idle speed adjustment; 10-throttle switch; 11-throttle; 12-air flow sensor; 13-combination relay; 14-lamda sensor; 15-coolant temperature sensor; 16-temperature-time switch; 17- power distributor; 18-aux air valve; 19- mixed adjustment screw; 20-accumulator; 21-machine switch

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Electric fuel pump Fuel pressurization

fuel pressurization

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