Class 4 (4th Engineer) MEKM 📅 Sep 2025

Exam Question

(a) Sketch a main engine jacket water cooling system (8)

(b) State why chemical treatment of such systems is necessary (4)

(c) What tests are carried out to ascertain the level of the concentration of the chemicals in the jacket cooling water system? (4)

Reference Answer

### (a) Main Engine Jacket Water Cooling System (Central Cooling)
The main engine jacket water cooling system is a critical auxiliary system designed to remove excess heat from the engine's combustion spaces to maintain optimal operating temperatures for components like cylinder liners, cylinder heads, and turbochargers. The modern standard is a Central Cooling System, which consists of two distinct closed-loop circuits: a High Temperature (HT) circuit and a Low Temperature (LT) circuit.
A sketch would illustrate the following components and flow paths:
**1. High Temperature (HT) Circuit:**

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