lesson 8 for automotive

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<b>STRUCTURE OF THE INTERNAL COMBUSTION ENGINE</b>

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<b>*Disassemble and inspect the carburetor1 Disassemble process</b>

1. Drain the coolant from the engine2. Remove the air filter

3. Remove the throttle cable from the carburetor4. 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 manifold8. Use a cloth to cover the intake pipe

Figure 1. Remove the carburetor from the engine

<small>2</small>

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<b>2. Remove the carburetor cover</b>

1. Remove the electrical terminals from the electrical connector2. Remove the vacuum line to the CB unit

Figure 2. Remove the carburetor cover

<small>3</small>

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Figure 3. Remove the fuel float and carburetor choke

Figure 4. Remove the valves and carburetor circulator

<small>4</small>

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Figure 5. Remove the throttle valve and throttle shaft

Figure 6. Remove diffuser throat and pump mechanism

<small>5</small>

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Figure 8.7. Check fuel float and 3-sided valve1. Observe and check floats and valves

2. Check piston movement

3. Check the opening and closing of the valve

<small>6</small>

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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 off5. 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 <small>7</small>

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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

<small>8</small>

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Figure 10. Check throttle and carburetor adjustment

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

<small>9</small>

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Figure 13. Check the intake valve ^{Figure 14. Check the exit valve}

Figure 15. Check the pump membrane ₁₀

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Figure 16. Electronic fuel injection system diagram

<i>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</i>

<small>11</small>

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<i>Electric fuel pump Fuel pressurization </i>

<i>fuel pressurization</i>

<small>12</small>

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