Class 4 (4th Engineer) MEKM 📅 Apr 2023

Exam Question

(a) Describe the procedure for taking crankshaft deflections of auxiliary engine 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
Crankshaft deflection measurement is a critical diagnostic procedure to assess the alignment of an engine's main bearings and the integrity of the crankshaft and bedplate. An accurate procedure coupled with strict safety precautions is paramount.
#### Precautions to be Observed (Surveyor-Grade Detail)
1. **Engine State & Isolation**: The engine must be stopped and completely isolated. The measurement must be taken when the engine is **cold** to prevent thermal expansion from skewing the readings. A stable, cold condition provides a consistent baseline for trend analysis.

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