Page 98 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

EXERCISE 4.3: Overhauling carburettor

Objectives

At the end of this exercise you shall be able to
• remove the carburettor from the engine
• dismantle the carburettor
• clean the passage of the various jets of the carburettor with air
• inspect the float for any damage/puncture
• inspect the needle and the needle valve seat for scoring
• check the operation of the toggle mechanism for free movement of the needle
• check and adjust the float level
• check the bottom flange for distortion and correct it
• assemble the carburettor
• inspect the manifold flange and fit the carburettor on it.

Requirements

Tools/Instruments Materials

• Trainee’s tool kit - 1 No. • Carburetror overhauling kit
• Cleaning tray • Petrol
Equipments/Machines
• Air compressor - 1 No.

Procedure

Air compressor
Dismantling
• Remove the air cleaner hose and the air cleaner.
• Disconnect the accelerator pedal linkage.
• Disconnect the choke cable.
• Disconnect the fuel pipe connection to the float chamber.
• Remove the carburettor mounting nuts.
• Remove the carburettor.
• Close the inlet manifold passage with a piece of card- board.
• Remove the carburettor top cover.
• Remove the packing.
• Take out the float.
• Remove the toggle mechanism and needle valve.
• Remove the float needle valve seat from the carburettor cover.
• Remove the fuel inlet passage filter with the holder.
• Remove the starter unit.
• Remove the main jet holder with the washer.
• Remove the main jet and note down the jet number.
• Remove the pilot jet. Note down its number.
• Remove the starter jet. Note down its number.

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