Home » Case Studies » Complete Main Engine Overhaul of PORT & STBD YANMAR 6EY26 Within 15 Days onboard Offshore Support Vessel
Table of Contents
Case Study
Complete Main Engine Overhaul of PORT & STBD YANMAR 6EY26 Within 15 Days onboard Offshore Support Vessel
Table of Contents
Background
Industry
Marine
Solution
Complete Main Engine Overhaul
Make & Model
YANMAR 6EY26
Asset
Offshore
Support Vessel
Objective
The complete
Overhaul of Yanmar Engines
(STBD & PORT) was successfully completed within the committed 15-day window without compromising on quality or safety.
Challenge / Problem Context
1. Extremely tight deadline for overhaul completion
2. Coolers were found to be choked, affecting performance
3. Valve springs and seats had to be reused due to unavailability
4. Absence of essential tools onboard for dismantling and assembly
What Did We Do?
1. Addressed the tight 15-day timeline by deploying a dedicated 8-member team and planning the work in parallel streams across both engines.
2. Conducted thorough chemical cleaning and physical drilling of choked air and oil cooler tubes; performed pressure testing at 5 kg/cm² for 30 minutes to ensure integrity.
3. Reused springs and some valve seats after detailed inspection, cleaning, and calibration, ensuring they were still within operational tolerances.
4. Manufactured custom tools required for dismantling and assembly of pistons, connecting rods, and cylinder heads due to unavailability onboard.
Results That We Achieved
1. The complete overhaul of yanmar engines (STBD & PORT) was successfully completed within the committed 15-day window without compromising on quality or safety.
2. Post-cleaning, both coolers were restored to optimal operating condition with no further leakages or restrictions, confirmed through pressure tests and sea trial.
3. The reused components performed satisfactorily under full load trial conditions, backed by tight inspections and manufacturer-aligned tolerances.
4. The customized tools enabled uninterrupted workflow, reducing dependencies and contributing to timely job completion.
