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Class 4 (4th Engineer) MEKM 📅 Jul 2023

Exam Question

(a) What is crank web deflection and purpose of measuring the same? (4)

(b) How crank web deflections are taken, describe the process (6)

(c) Describe the process to locate faulty main bearing by taking crank web deflection measurement (6)

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Reference Answer

### (a) Crank Web Deflection: Definition and Purpose
**Definition:**
Crank web deflection is the measurement of the minute opening and closing of a single crank throw's webs as the crankshaft is rotated through 360 degrees. This measurement is taken between designated punch marks on the inner faces of the webs. It directly quantifies the amount of bending experienced by that section of the crankshaft.
**Purpose:**

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