Exam Question
Describe the crankcase inspection of an auxiliary engine driving an alternator, under each of the following headings
(a) Safety (4)
(b) Timing gears (4)
(c) Running gears (4)
(d) Oil pipes and system (4)
Class 4 (4th Engineer)
MEKM
📅 Aug 2023
Reference Answer
A comprehensive crankcase inspection of an auxiliary engine is a critical planned maintenance task to ensure operational reliability and prevent catastrophic failure. The inspection should be conducted systematically, adhering to strict safety protocols.
### (a) Safety (4 Marks)
Safety is the paramount consideration before, during, and after a crankcase inspection. The following procedures are mandatory to prevent accidents, particularly crankcase explosions and personal injury:
* **Cool-Down Period**: After stopping the engine, a minimum waiting period of 20 minutes must be observed before opening any crankcase doors. This allows internal hot spots (e.g., piston undercrown, bearings) to cool below the auto-ignition temperature of atomized lubricating oil, mitigating the risk of a secondary crankcase explosion upon the ingress of fresh air.
### (a) Safety (4 Marks)
Safety is the paramount consideration before, during, and after a crankcase inspection. The following procedures are mandatory to prevent accidents, particularly crankcase explosions and personal injury:
* **Cool-Down Period**: After stopping the engine, a minimum waiting period of 20 minutes must be observed before opening any crankcase doors. This allows internal hot spots (e.g., piston undercrown, bearings) to cool below the auto-ignition temperature of atomized lubricating oil, mitigating the risk of a secondary crankcase explosion upon the ingress of fresh air.
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