Class 4 (4th Engineer) MEKM 📅 Feb 2023

Exam Question

(a) What lubricating oil test are carried out on auxiliary engine sump oil (4)

(b) What interference is drawn from each of the tests? (4)

(d) What is the frequency of on-board LO test? (2)

Reference Answer

### (a) Lubricating Oil Tests for Auxiliary Engine Sump Oil
The primary onboard tests carried out on auxiliary engine (trunk piston type) sump oil are:
1. **Viscosity Test:** Measures the oil's resistance to flow. It is a critical physical property indicating the oil's load-carrying capacity and suitability for service.
2. **Water Content Test:** Determines the percentage of water contamination in the oil. This can be a simple 'crackle test' (hot plate method) or a more accurate chemical test using calcium hydride kits.

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