Page 107 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

EXERCISE 5.3: Overhauling the fuel feed pump in diesel

engine

Objectives

At the end of this exercise you shall be able to
• overhaul the mechanical fuel feed pump
• overhaul the electrical fuel feel pump.

Requirements

Tools/Instruments Materials/Components
• Trainee’s tool kit - 1 No. • Kerosene - as reqd.
• Circlip plier - 1 No. • Diesel - as reqd.
• Soap oil - as reqd.
Equipments/Machines
• Cotton cloth - as reqd.
• Multicylinder diesel engine - 1 No. • New gasket - as reqd.
• Air compressor - 1 No.
Procedure

TASK 1: Overhaul the mechanical fuel feed pump
Dismantling (Fig 1)
Fig 1
1 Disconnect the fuel lines of the feed pump.

2 Remove the feed pump assembly from the fuel injection pump by
loosening the mounting nuts uniformly.
3 Remove the filter housing (17) by loosening the clamping nut
(14), screw (13) and clip (15) along with the spring (16), filter (18)
and gasket (20).
4 Remove the snap ring (7) and take out the roller tappet assembly
of the feed pump.
5 Remove the screw plug (2) and gasket (3) and take out the
plunger and spindle (5 & 6) with the return spring (4).
6 Remove the hand priming pump (12) and gasket (21).
7 Remove the screw plug (22), gasket (21) and remove the valves
(24), along with the springs (23).
8 Remove the roller pin (9) and roller (8).
9 Remove the slider (10), tappet (11) and spring (19).
10 Clean all the parts of the fuel feed pump with kerosene or diesel.
11 Check visually all the parts for wear and replace if required.

12 Check the tension of all the springs, and replace if necessary.
13 Check the valve seats.
14 Check the gaskets, and replace if necessary.
15 Check the filter clamping nut threads.

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