Class 4 (4th Engineer) MEKM 📅 Feb 2026

Exam Question

Indicator cards have shown that one cylinder is high in power although the maximum pressures is low. State the associated effects that this might have on the instruments of the engine and give a detailed description of the method of rectifying the defect. If this abnormality were not remedied, what might be the subsequent effects on the operation of the engine? State the type of engine to which your answer refers. (16)

Reference Answer

### Engine Type
This answer refers to a low-speed, two-stroke, crosshead marine diesel engine, specifically a **Sulzer RTA 58** or a similar model with camshaft-operated fuel pumps and variable injection timing (VIT).
### 1. Analysis of the Defect and Associated Instrument Effects
An indicator card showing a low maximum firing pressure (Pmax) combined with a high mean indicated pressure (MIP), which equates to high power, is characteristic of a specific combustion fault. This condition arises from a combination of **retarded (late) fuel injection timing** and **excessive fuel delivery** to the specific cylinder unit.

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