Page 38 - CTS - Mechanic Diesel - TP
P. 38

MECHANIC DIESEL - CITS



                           D   = Diameter of the bore in cm

                           L   = Stroke length in cm
                           N   = Number of cylinders
           18 Compare the cc value given by the engine manufacturer with measured cc value for any deviations.

              Note: If any engine cylinder bore reconditioning work is done, check this engine displacement
              volume and then calculate compression ratio.
           19 Calculate the compression ratio of the engine using the following formula

                                  The total cylinder volume when piston at BDC
              CompressIon  Ratio =
                                  The total cylinder volume when piston at TDC

                   Vs + Vc
              CR =
                     Vc
              Where,
              Vs = Swept volume
              Vc = Clearance volume
           20 Compare the compression ratio with manufacturer’s recommendation.

              Note:

              •  The volume of combustion chamber and cylinder head gasket thickness are to be added while
                 calculating the cylinder volume.
              •  The volume of the head gasket is calculated by multiplying its thickness by the square at the
                 bore and 0.7854.

           21 Refit cylinder head and other removed components
           22 Reconnect fuel, coolant and other electrical connections.







































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                                      CITS : Automotive - Mechanic Diesel  - Exercise 2.4
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