Page 123 - Mechanic Diesel - TT

MECHANIC DIESEL - CITS

2 Enlargement of the hole of the accelerator jet.
8 Cold engine not starting quickly
1 The choke is left open.
2 Jamming of the flexible cable running the choke.

3 Less oil reaching the carburetor.
9 Engine not starting quickly when warm
1 Closing of choke.
2 Flooding the carburetor.
3 Vapor locking in the pipe.

10 Engine stall attempt (Engine Stalz)
1 Idle speed not adjusted properly.
2 Idle fuel mixture not correct.
3 Choke not working properly.
4 Incorrect setting of float ball.

5 Water or garbage getting into petrol.
6 Throttle leak and accelerator pump not working properly.
Parts of the carburetor
1 Venturi

2 needle valve
3 float
4 float chamber
5 throttle valve
6 accelerating pump
7 Body

8 choke valve

Trouble shooting in carburetor fuel system and its

components

Objectives: At the end of this lesson you shall be able to
• demonstrate Trouble shooting in carburetor fuel system and its components.

a Leakage of petrol from carburettor
1 If the float is punctured it fills with petrol and sits down in the float chamber. Therefore, the needle valve on
it is pulled down and the fuel pump continues to supply petrol, overflowing the float chamber and causing
petrol leakage.
2 High float level. Due to this, the petrol level goes above the mouth of the nozzle in the float chamber and
petrol leakage starts. For this, the petrol level in the float chamber is two mm below the mouth of the nozzle.
It should be set as much.
3 If the float chamber top cover gasket is broken, there will be petrol leakage from that place.

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CITS : Automotive - Mechanic Diesel - Lesson 29 & 30