Page 96 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

EXERCISE 4.2: Overhauling AC fuel pump

Objectives

At the end of this exercise you shall be able to
• remove the fuel pump from the vehicle
• dismantle the fuel pump
• inspect the diaphragm for any damage, and the diaphragm spring for tension
• inspect the rocker arm pivot for wear
• check the valve and valve seat for leakage
• fit the valves in the fuel pump
• align the diaphragm spindle with the rocker arm
• assemble the upper and lower body of the fuel pump
• fit the pump on the engine.

Requirements

Tools/Materials

• Trainee’s tool kit - 1 No. • Air compressor - 1 No.
• Measuring Tape - 1 No. • Cotton waste - as reqd.
• Car - 1 No. • Soap oil - as reqd.

Procedure

Air compressor

1 Removing and dismantling
2 Disconnect the inlet fuel line from the fuel tank to the fuel pump.
3 Tie the fuel line (from the tank) slightly above the tank level, to avoid spillage of fuel.
4 Remove the outlet pipe connecting the fuel pump and the carburettor float chamber.
5 Secure the outlet pipeline.
6 Remove the fuel pump mounting bolts.
7 Remove the fuel pump with the gasket.
8 Make an in-line mark on the side of the two halves, valve housing cover, pump chamber and bottom cover,
to ensure the same position of the above parts when assembling back.
9 Remove the screws and washers holding the upper and lower bodies.
10 Separate the upper and lower halves.
11 Remove the valve housing cover screw, then remove the housing cover.
12 Remove the gasket.
13 Remove the strainer.
14 Remove the inlet valve assembly.
15 Remove the outlet valve assembly.
16 Remove the diaphragm assembly.
17 Remove the diaphragm return spring lock.
18 Remove the diaphragm return spring.
19 Remove the lever pin plug.
20 Remove the crank lever pin-lock.

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