Stern Tube, Shafting, and Propeller
With our extensive experience, our engineers have expertise in the forensic investigation, technical assessment, and end-to-end coordination of approved repairs for stern tube systems, shafting assemblies, intermediate and stern tube bearings, and both Fixed Pitch Propellers (FPP) and Controllable Pitch Propellers (CPP). Our team of marine engineers and naval architects is trusted by leading shipowners, P&I Clubs, and H&M underwriters for swift, accurate, and cost-effective solutions across the US and globally.
Expertise in Damage Investigation and Failure Analysis
We conduct root-cause analysis and technical reporting with leading industry partners for:
- Shaft misalignment and journal wear
- Water ingress and oil contamination in the stern tubes
- Premature bearing wear and metal-to-metal scoring
- Crankshaft or tail shaft fatigue, bending, or crack propagation
- CPP hydraulic system failure and control valve malfunction
- Propeller blade impact, cavitation erosion, and imbalance
- Dry running of bearings, oil starvation, and seal deterioration
Using shaft alignment data, ultrasonic and NDT inspection records, vibration analysis data, and oil lab diagnostics reports, we provide failure analysis following the IACS guidelines, OEM design parameters, and operational history.
Shafting, Bearing, and Propeller- Repair Oversight
Due to our expertise, we routinely supervise and coordinate class-approved repairs with specialized workshops, OEM representatives, and shipyard teams for:
- Laser-based shaft alignment and bearing load adjustment
- Blue fitting, bearing clearance verification, and journal inspection
- Complete recasting, fabrication, and fitment of white metal bearings
- Shaft polishing, chrome plating, and in-situ grinding
- CPP hub dismantling, internal blade and seal inspection
- Servo valve repairs and pitch control system testing
- FPP repairs and balancing
- Dynamic balancing and crack detection post-grounding
- OEM-compliant in-situ repairs of FPP/CPP systems
Underwater Repair and Dive Support
We have extensive experience working with the most experienced class-certified underwater dive support teams across the Americas for vessels on loaded condition or restricted by drydock availability. Our underwater repair coordination includes:
- In-water stern tube seal replacements using habitat enclosures
- Underwater shaft and propeller condition assessment
- Precision blade measurements, edge repairs, and polishing
- Class-compliant photographic and video documentation
These specialized operations have saved our clients substantial costs by avoiding deviation and drydocking delays, ensuring faster operational turnaround even while the vessel remains fully laden.