Page 77 - Mechanic Diesel - TT

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