Exam Question
(a) Describe how Auxiliary engine crankshaft deflections 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
📅 Nov 2024
Reference Answer
### (a) Procedure for Measuring Auxiliary Engine Crankshaft Deflections
**1. Purpose:**
Crankshaft deflection measurement is a critical diagnostic procedure to assess the alignment of the main bearings. Misalignment, caused by factors such as bearing wear, foundation chocking degradation, or hull flexing, imposes bending stresses on the crankshaft webs. If left uncorrected, these alternating stresses can lead to fatigue failure of the crankshaft.
**2. Prerequisites:**
**1. Purpose:**
Crankshaft deflection measurement is a critical diagnostic procedure to assess the alignment of the main bearings. Misalignment, caused by factors such as bearing wear, foundation chocking degradation, or hull flexing, imposes bending stresses on the crankshaft webs. If left uncorrected, these alternating stresses can lead to fatigue failure of the crankshaft.
**2. Prerequisites:**
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