Lifan 620. Manual — part 39

Section VI Intake and Exhaust System

I. Air Cleaner Assembly

Removal and installation (Fig. 2-82 shows the air cleaner assembly of sedan with TRITEC1.6L
engine).

Note:

The filter core is made from waste paper and resin. Notes for operation:

Do not inflict severe collision and load after assembly and removal.

①

②

The core should be well cooperated with the housing below the air cleaner during assembly.

7. Spring clip 8. Air cleaner lower cover

9. Air cleaner assembly 10. Hexagon bolt with flat washer

11. Liner tube 12. Anti-vibration pad

13. Snap button 14. Air cleaner intake pipe assembly

15. Spongy cushion of cavity resonator 16. Hexagon flange bolt

17. Cavity resonator assembly 18. Hexagon flange nut

19. Bearing weldment bolt

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II. Removal and Installation of Exhaust Pipe and Muffler

1. Removal and installation (Fig. 2-83 shows the exhaust system of the TRITEC1.6L engine)

2. Inspection
Start the engine and check if there is leakage in the components of the exhaust system
assemblies. In case of a leakage, repair or replace it as necessary.
Check all components or assemblies. In case of open weld or damage, replace it if necessary.

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Chapter III ABS

Section I Function and Composition of ABS

I. Function of ABS

To improve stability of the vehicle;

①

To ensure steering

②

performance of the vehicle;

③

Hydraulic control unit is composed of two hydraulic circuits and solenoid valve, which calculates

and determines slide situation to decide the ABS operation according to the signal from the sensor,

and then controls the program to start the solenoid valve and motor to increase, decrease and

maintain the pressure and so on.

3. Sensing

The sensing sends the signal from the gear rotation detection to ECU.

4. Motor

The motor rotates according to the signal of ECU. And the bearing transfers the rotation into

straight reciprocating motion to cycle the brake fluid.

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Section II Principle of ABS

I. Control Principle of ABS

Fig. 3-2 shows the control principle of ABS.

Fig. 3-3

The pressure of master pump will be transmitted to wheel slave cylinder through normally opened

valve to apply the brake. If no further braking is needed, the driver can reduce the pressure to the

brake pedal, which allows the brake fluid return to master pump for pressure decrease.

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