Exam Question
(a) Describe how crankshaft deflections of an Auxiliary Engines are measured. (6)
(b) State how the measurements can be checked for accuracy. (5)
(c) Specify with reasons other checks that should be made on the crankshaft. (5)
Class 4 (4th Engineer)
MEP
📅 Oct 2022
Reference Answer
### (a) Procedure for Measuring Crankshaft Deflections of an Auxiliary Engine
The purpose of measuring crankshaft deflections is to assess the alignment of the main bearings. Misalignment causes the crankshaft to bend during rotation, inducing cyclic stress which can lead to fatigue failure. The procedure is as follows:
**1. Pre-Conditions:**
* **Engine State:** The engine must be stopped, and the turning gear engaged. The vessel should be afloat and upright, with normal loading conditions if possible.
The purpose of measuring crankshaft deflections is to assess the alignment of the main bearings. Misalignment causes the crankshaft to bend during rotation, inducing cyclic stress which can lead to fatigue failure. The procedure is as follows:
**1. Pre-Conditions:**
* **Engine State:** The engine must be stopped, and the turning gear engaged. The vessel should be afloat and upright, with normal loading conditions if possible.
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