MAIN ENGINE MONITORING
Detailed operational monitoring uncovers hidden engine faults
Undetected engine inefficiencies were revealed, unlocking opportunities to enhance performance and lower fuel consumption.
The chart shows main engine overconsumption across the operating range, indicating a deviation from expected performance. This deviation was linked to incorrect or missing input signals affecting engine control.
The case highlights the importance of correct VIT (Variable Injection Timing) tuning on mechanically controlled (MC) engines—and how continuous performance insight enables earlier detection of issues.
Identifying the issue
The vessel was operating with a faulty VIT IP converter, which was sending incorrect—or no—signal to the control system. This directly impacted engine performance and fuel efficiency.
The issue was identified through performance monitoring, and the crew was notified before the problem had been detected onboard.
Understanding the context
VIT (Variable Injection Timing) is a key function in mechanically controlled engines, used to optimise fuel efficiency.
By advancing injection timing above approximately 40% load, VIT ensures that maximum combustion pressure (pmax) is reached at around 85% MCR—supporting optimal engine performance.
From insight to action
Once identified, the faulty converter was replaced.
Delivering operational value
This case demonstrates how detailed monitoring can:
- Detect issues that may otherwise go unnoticed
- Enable earlier intervention
- Provide better conditions for informed decision-making
A clearer view of performance
The benefit of detailed performance monitoring can be likened to putting on a pair of glasses—making previously unseen inefficiencies visible and enabling better—informed operational decisions.
