Page 107 - CTS - Mechanic Diesel - TP
P. 107

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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