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Table of Contents

Case Study

Emergency Repair of Portside Clutch HL80Y on Niigata 6L28HX Engine on Offshore Support Vessel

Table of Contents

Background

Industry
Marine
Solution
Clutch Repair
and Overhaul
Make & Model
Niigata 6L28HX
Engine & Port
Clutch HL80Y
Asset
Offshore
Supply Vessel

Objective

To perform an emergency repair and overhaul of the damaged port clutch to restore functionality, eliminate oil leakage, and prevent vessel downtime.

Challenge / Problem Context

  • Severe oil leakage at the clutch output shaft
  • Broken output shaft flyer and damaged seal race
  • Worn-out bearing and abnormal shaft movement
  • Heat marks and wear on output shaft coupling
  • Urgent response needed to prevent vessel downtime

What Did We Do?

1. Mobilized Emergency Service Team

  • Diverted Neptunus’ available team stationed in Qatar to the vessel at short notice.
  • Prioritized the job to address the emergency breakdown and Clutch Marine Services.

2. Clutch Dismantling and Inspection

  • Disconnected oil pipelines and electricals.
  • Removed input/output shaft flanges, housing bolts, and upper housing.
  • Transported the clutch to the workshop for detailed dismantling.
  • Identified damaged components: output shaft flyer, seal race, bearings, coupling, and friction plates.

3. Component Reconditioning

  • Reconditioned the damaged flyer and seal race by adding sleeves and machining excess material.
  • Reconditioned the output shaft coupling to remove roughness and restore geometry.
  • Polished the output shaft seating area to eliminate scratches.

4. Replacement of Damaged Parts

  • Replaced bearings, seal rings, friction and steel plates, gaskets, and springs.
  • Used Niigata-approved genuine spares with traceability.

5. Reassembly and Quality Check

  • Assembled the clutch with new and reconditioned components.
  • Conducted thorough testing for oil leakage, noise, and vibration.
  • Verified STBD clutch to ensure no similar issues were present.

Results That We Achieved

  • Immediate containment and resolution of oil leakage.
  • Restored clutch performance with no abnormal sound or vibration.
  • Prevented major vessel downtime through rapid emergency response.
  • Reconditioned key components to extend clutch life and reduce replacement cost.
  • Delivered a successful overhaul using genuine NIIGATA parts, aligned with OEM standards.

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