Exam Question
(a) Describe how A.E. 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
📅 Oct 2023
Reference Answer
### (a) Procedure for Measuring Auxiliary Engine Crankshaft Deflections
A comprehensive procedure for measuring crankshaft deflections on an auxiliary engine, ensuring accuracy and safety, involves the following steps:
1. **Prerequisites & Safety:**
* **Engine Condition:** The engine must be stopped and in a cold state. As stated in the reference, measurements taken when warm can differ significantly due to thermal expansion of the engine block and crankshaft, leading to inaccurate results. The measurement must represent the static alignment of the bearings.
A comprehensive procedure for measuring crankshaft deflections on an auxiliary engine, ensuring accuracy and safety, involves the following steps:
1. **Prerequisites & Safety:**
* **Engine Condition:** The engine must be stopped and in a cold state. As stated in the reference, measurements taken when warm can differ significantly due to thermal expansion of the engine block and crankshaft, leading to inaccurate results. The measurement must represent the static alignment of the bearings.
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