Propulsion Integrity
Precision Engineering & OverhaulPropulsion Engineering Support
Precision Propulsion Solutions for Mission Readiness
Luhar Kalidas provides specialized marine engineering support for the inspection, maintenance, repair and overhaul of Controllable Pitch Propeller (CPP) systems and propeller shaft assemblies.
Our services focus on restoring equipment reliability, maintaining operational efficiency and supporting the safe performance of marine vessels. Our capabilities can include propeller shaft inspection, wear assessment, shaft repair, sealing system maintenance, bearing inspection, component refurbishment and alignment checks, according to the vessel's technical requirements and approved repair specifications.
For CPP systems, repair activities may include inspection and servicing of the hub assembly, pitch-control mechanisms, hydraulic components, sealing arrangements and associated operating systems, subject to equipment type and repair scope.
We understand the critical role of propulsion systems in vessel performance. Therefore, we emphasize precision workmanship, proper inspection procedures, technical compliance and quality control throughout every repair activity.
- CPP Hub & Pitch Servicing
- Shaft Dimensional Checks
- Stern Tube Seal & Bearing
- Hydraulic & OD Box Overhaul
Our Capabilities
Comprehensive CPP & Shaft Overhaul Capabilities
Precision engineering solutions designed to restore mechanical tolerances, ensure seal integrity, and optimize propulsion efficiency.
CPP Inspection & Repair
Complete overhaul and servicing of Controllable Pitch Propeller hub assemblies, blade carriers, and pitch mechanisms.
- Hub assembly complete dismantling & cleaning
- Pitch control mechanism inspection
- Blade carrier & crank pin examination
- Blade seal renewal & groove inspection
- Hydraulic servo cylinder & piston overhaul
- Sliding shoe & pin clearance measurement
- Contact check of blade flanged faces
- Hub pressure testing & leak verification
Propeller Shaft & Tail Shaft
Thorough inspection, dimensional qualification, and reconditioning of intermediate and tail propeller shafts.
- Shaft withdrawal & docking survey support
- Shaft wear assessment & dimensional checks
- Run-out and deflection measurements
- Non-destructive testing (MPI / DP testing)
- Taper & keyway crack detection
- Shaft liner / sleeve inspection & machining
- Corrosion assessment & surface restoration
- Class surveyor documentation & sign-off
Stern Tube Seal & Bearing
Maintenance, clearance measurement, and replacement of forward/aft stern tube sealing arrangements and bearings.
- Forward & aft lip seal ring replacement
- Chrome steel liner inspection & skimming
- In-situ seal bonding & vulcanization
- White metal bearing wear-down gauging
- Thordon / composite bearing clearance checks
- Bearing re-metalling & finish-machining
- Lube oil system flushing & particulate analysis
- Header tank & gravity system inspection
Shaft Alignment & Run-Out
Ensuring smooth torque transmission, minimal vibration, and optimum bearing load distribution across the driveline.
- Laser optical alignment verification
- Crankshaft web deflection checks
- Intermediate shaft flange gap & sag checks
- Plummer block bearing load verification
- Chockfast resin re-chocking & bolt tensioning
- Reduction gearbox coupling alignment
- Vibration analysis & dynamic balancing support
- Post-repair alignment certificates
Marine Hydraulic Systems
Inspection, troubleshooting, and overhaul of Oil Distribution (OD) boxes and hydraulic power units driving pitch control.
- Oil Distribution (OD) box overhaul & seal renewal
- Hydraulic power unit (HPU) pump servicing
- Proportional & directional control valves
- High-pressure hydraulic piping inspection
- Electronic pitch feedback transmitter calibration
- Emergency mechanical pitch lock verification
- Hydraulic oil flushing & filter replacement
- System pressure & response time testing
Assembly & Testing
Controlled re-assembly under strict technical procedures followed by rigorous pressure testing and sea trials.
- Precision torqueing of blade bolts & locking
- Hub static pressure testing prior to undocking
- Full ahead to full astern pitch travel checks
- Pitch angle indicator calibration at bridge & ECR
- Dock trial performance monitoring
- Full sea trial vibration & speed verification
- Compliance with technical repair specifications
- Comprehensive final engineering report
Our Approach
CPP & Shaft Overhaul Workflow
Inspection & Clearance Gauging
Measurement of initial clearances, wear-down, blade root backlash, and NDT crack assessment.
Dismantling & Component Servicing
Complete disassembly of hub, shaft withdrawal, seal renewal, and precision workshop machining.
Re-Assembly, Alignment & Sea Trials
Controlled torquing, optical shaft alignment, pressure testing, and sea trial commissioning.
Why Luhar Kalidas
Why Choose Us for Propulsion Engineering
Precision & Technical Compliance
Every activity adheres strictly to OEM technical specifications, classification society guidelines, and approved repair scopes.
Specialized Propulsion Knowledge
Deep expertise in complex mechanical hub mechanisms, hydraulic actuation systems, and stern tube sealing technologies.
Minimized Vessel Downtime
Streamlined execution during scheduled dry docking or emergency port calls to restore vessel operational readiness promptly.
Frequently Asked Questions
Propulsion & Shaft Maintenance FAQs
Propulsion EngineeringGet In Touch
Have a CPP or Shaft Maintenance Requirement?
Contact Luhar Kalidas today to discuss your vessel's propulsion system overhaul, tail shaft survey, or hydraulic troubleshooting needs.