Page 41 - CTS - Mechanic Diesel - TP
P. 41

MECHANIC DIESEL - CITS



           EXERCISE 2.7: Removing and checking the camshaft


            Objectives

           At the end of this exercise you shall be able to
           •  remove and inspect camshaft from the engine
           •  check cam shaft bend and twist
           •  inspect cam lobe and journal
           •  measure cam lobe height.

           Requirements

          Tools/Instruments
          •  Trainee’s tool kit                  - 1 No.       •  Surface table                 - 1 No.
          •  Mallet                              - 1 No.       Materials/Components
          •  Feeler gauge,                       - 1 No.
          •  Outside micrometer                  - 1 No.       •  Tray                          - 1 No.
          •  Dial test indicator                 - 1 No.       •  Cotton cloth                  - as reqd.
          •  ‘V’ block                           - 2 No.       •  Kerosene                      - as reqd.
                                                               •  Soap oil                      - as reqd.
          Equipments/Machines                                  •  Lube oil                      - as reqd.
          •  Multi cylinder diesel engine        - 1 No.



            Procedure

           •   Remove the bolts (1) retaining the camshaft thrust plate and remove thrust plate (Fig 1)
           •   Support the camshaft and carefully slide the journals through  each bearing. Avoid contact of the surface with
              cam lobe and pull out the camshaft. (Fig 2)

              Fig 1                                              Fig 2





















           •   Clean the camshaft thoroughly.

           •   Inspect the camshaft journals for scratches, grooves and pitting marks.
           •   Measure each journal for ovality, taper and wear.
           •   Check camshaft for bend and twist with dial test indicator
           •   Check cam lobes surface for wear. (Fig 3)

           •  Measure diameter of the base circle (1) of camshaft with a micrometer.



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