Class 4 (4th Engineer) MEKM 📅 Jul 2025

Exam Question

(a) Describe the procedure for taking crankshaft deflections, explaining all precautions that must be observed. (8)

(b) Explain what deflection readings actually mean and suggest the action which must be taken should readings be outside values recommended by the engine manufacturer. (8)

Reference Answer

### (a) Procedure and Precautions for Taking Crankshaft Deflections
**1. Objective**
Crankshaft deflection measurement is a critical diagnostic procedure performed to assess the alignment of the crankshaft's main journals. It quantifies the bending of the crankshaft as it rotates, which is a direct indicator of main bearing wear, bedplate distortion, or foundation issues. Regular monitoring helps in preventing catastrophic failures such as a broken crankshaft.
**2. Prerequisites and Precautions**

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