Tugboat Alignment Scope Expanded into Full Driveline Correction

We were initially brought in to evaluate alignment across the propulsion system on a tugboat. As measurements and inspections progressed, it became clear the scope extended well beyond a standard alignment check. What began as a three-day scope ultimately extended into a five-week project, once opened, it quickly became a Pandora’s box of underlying issues.

Existing Chockfast liners were removed due to poor alignment condition, with seized hold-down bolts requiring cutting for removal. Sole plates were cleaned and reconditioned, and mounting hardware was replaced to establish a proper foundation for alignment .

Further inspection identified multiple contributing issues across the system. Port and starboard engine mounts were replaced and balanced. Torsional coupling rubber elements and coupling links were replaced, and the starboard coupling adapter was repaired with a new alignment pin installed. Bulkhead bearings were also replaced on both sides to restore proper support and geometry .

Alignment was carried out using FARO laser tracking, establishing accurate reference axes across engines, bulkhead bearings, and Z-drives. This allowed us to reset the driveline geometry and bring all components back within manufacturer tolerances .

Vibration analysis was performed across engines, bearings, and driveline components. While order-related peaks consistent with residual unbalance were present, overall vibration levels remained within ISO acceptable ranges, confirming system stability post-correction .

One remaining issue identified was misalignment on the starboard firefighting pump, with coupling elements removed for replacement and realignment.

Recommendations included:

Precision alignment of the firefighting pump and replacement of coupling links
Alignment evaluation of port-side HPU pulleys
Follow-up alignment check in 6 months to account for mount settling
Implementation of an annual vibration monitoring program

This project is a good example of how early findings can expand scope, and why addressing the full system at once leads to a more reliable result. This is also why we always recommend a quarterly, biannual, or, at the very least, annual assessment to identify issues before they become major problems, preventing your fleet from being out of operation and in downtime. 

Contact us today for a consultation!