Page 77 - Mechanic Diesel - TT
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MECHANIC DIESEL - CITS



           Reason for measuring cylinder block for various parameters
           to find out its serviceability and suggestions for remedial

           measures. Reasons  for frequently  occurring  abnormal

           wear  in  cylinder  block  components  and  its  Effects  on

           engine performance

           Objectives: At the end of this lesson you shall be able to
           •  explain Reason for measuring cylinder block for various parameters
           •  suggest serviceability for remedial measure of cylinder block patys
           •  demonstrate Reasons for frequently occurring abnormal wear in cylinder block components and its Effects
              on engine performance.


           Reason for cylinder block measuring various parameter to find out it’s serviceability and suggestion for
           remedial parameter

           Measuring various parameters of the cylinder block is essential to determine its serviceability and identify any
           issues that may affect its performance. Here’s:
           1  Dimensional accuracy: Checking dimensions ensures that the cylinder block can accommodate pistons and
             other components within specified tolerances. If dimensions are out of tolerance, it may indicate excessive
             wear or damage, requiring repair or replacement.
           2  Surface condition: Assessing surface roughness and flatness helps identify areas prone to leaks or poor
             sealing, suggesting the need for resurfacing or machining to restore proper sealing surfaces.
           3  Tolearance  verifications:  Ensuring  that  critical  features  such  as  bores  and  bolt  holes  meet  specified
             tolerances is crucial for proper assembly and alignment. If tolerances are exceeded, it may indicate wear or
             distortion requiring corrective action.
           4  Wear analysis: Measuring wear patterns and deviations from standard dimensions helps diagnose issues
             such as piston slap, cylinder wear, or bearing clearance problems. Remedial actions may include honing,
             boring, or installing oversized components.

           5  Sturctural integrity: Checking for distortion, cracks, or other defects helps assess the structural integrity of
             the cylinder block. If defects are found, remedial measures such as welding, sleeving, or replacement may be
             necessary.
           6  Performance optimization:  Analyzing  parameters like bore taper,  out-of-roundness,  and cylinder wall
             thickness provides insights into engine performance and potential efficiency improvements. Remedial actions
             may involve honing, decking, or cylinder sleeving to restore optimal conditions. Measuring various parameters
             of a cylinder block is crucial to ensure its serviceability and identify any potential issues. Here are 15 key points
             on why these measurements are important and some suggestions for remedial actions:
           7  Cylinder Bore Diameter: Ensures proper piston fit and seals for efficient combustion.
                Remedy: Honing or boring oversize if out of tolerance.
           8  Cylinder Bore Out-of-Roundness: Ensures uniform piston movement.

                 Remedy: Honing or re-boring for roundness.
           9  Cylinder Bore Taper: Ensures uniform piston movement throughout its stroke.
              Remedy: Honing or re-boring to restore taper.
           10 Deck Surface Flatness: Ensures proper head gasket sealing.

              Remedy: Milling or resurfacing if not flat.
           11 Deck Height: Affects compression ratio and piston clearance.
                Remedy: Machining to desired height if too high or low.



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                                     CITS : Automotive - Mechanic Diesel - Lesson 15 - 18
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