Unauthorized modification of main engine fuel pump linkage
- Safety Flash
- Published on 10 September 2026
- Generated on 12 October 2026
- IMCA SF 16/26
- 2 minute read
An unsafe and unauthorized modification was identified on the main engine high-pressure fuel pump linkage arrangement.
What happened?
During a recent inspection on board an anchor handling vessel, an unsafe and unauthorized modification was identified on the main engine high-pressure fuel pump linkage arrangement. An external metal shim had been installed on the linkage to increase the fuel rack position, and copper wire used to secure the modification. This improvised arrangement created a risk of improper fuel control, linkage failure, and potential loss of propulsion during engine operations.
Why did it happen?
- Temporary repairs became permanent: Instead of carrying out a proper repair using approved spare parts and methods (replacement or re-calibration injectors), an improvised temporary repair was applied.
- Weak compliance with procedures: Original Equipment Manufacturer (OEM) instructions, Planned Maintenance System (PMS) procedures and Company maintenance standards were not followed.
External shim installed and secured by wire. - Inadequate maintenance control: Maintenance work was not properly monitored, verified or inspected.
What do we learn?
- No unauthorized modifications: Improvised repairs on critical engine control systems can lead to catastrophic machinery failure and loss of vessel manoeuvrability.
- Follow OEM requirements: Critical engine components should never be modified. All maintenance and repairs should be carried out strictly in accordance with OEM recommendations.
- No temporary fixes on safety-critical systems: Don’t use of shims, wires, fabricated or “home-made” parts, or other improvised solutions on safety-critical equipment.
- Challenge abnormal conditions: Temporary repairs should be promptly rectified and never accepted as a permanent solution.
Push rod secured by wire External shim installed and secured by wire
Related Safety Flashes
-
IMCA SF 19/24
25 September 2024
-
-
IMCA SF 20/25
7 November 2025
-
-
IMCA SF 28/22
13 December 2022
-
IMCA Safety Flashes summarise key safety matters and incidents, allowing lessons to be more easily learnt for the benefit of the entire offshore industry.
The effectiveness of the IMCA Safety Flash system depends on the industry sharing information and so avoiding repeat incidents. Incidents are classified according to IOGP's Life Saving Rules.
All information is anonymised or sanitised, as appropriate, and warnings for graphic content included where possible.
IMCA makes every effort to ensure both the accuracy and reliability of the information shared, but is not be liable for any guidance and/or recommendation and/or statement herein contained.
The information contained in this document does not fulfil or replace any individual's or Member's legal, regulatory or other duties or obligations in respect of their operations. Individuals and Members remain solely responsible for the safe, lawful and proper conduct of their operations.
Share your safety incidents with IMCA online. Sign-up to receive Safety Flashes straight to your email.