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Table of Contents

Project

Major Overhaul (MOH) of Fixed Pitch Propeller Niigata ZP-41A on Multi-Purpose Vessel

Table of Contents

Background

Industry
Marine
Solution
Major Overhaul (MOH) of Propulsion System
Make & Model
Niigata ZP 41A (Fixed Pitch Propeller System)
Asset
Platform
Support Vessel

Summary About The Project

The Niigata ZP 41A underwent a major overhaul at a shipyard in Qatar, as part of routine maintenance. The overhaul covered extensive work on key components, ensuring that the engine, after 29,444 operational hours, was restored to optimal condition with all critical systems inspected and calibrated for continued reliable performance.

Planning

  • Number of Engineers: 6 (including team leader)
  • Planned Duration: 17 days
  • Job Carried Out: The team performed the overhaul by systematically disassembling and reassembling key engine and propulsion system components such as the gear case, vertical shaft, and propeller shaft assemblies, ensuring each part met OEM standards.

Procedure Carried Out (Scope of Work)

  • Gear Case Assembly: Drained oil, welded eye pad for z-peller dismantling, and successfully tested air pressure and stern tube seals.
  • Vertical Shaft Assembly: Safely disassembled, inspected, and reassembled the vertical shafts with new bearings.
  • Propeller Shaft Assembly: Dismounted propellers, replaced seals, bearings, and liners, and reassembled with the correct torque specifications.
  • Bed Assembly: Inspected and reassembled bed seal housings and liners, ensuring proper sealing and assembly.
  • Stern Tube Seal: Dismantled, cleaned, and replaced seals, liners, and gaskets.
  • Sea Trial: Conducted a sea trial, confirming all oil pressures and operational parameters were within satisfaction, with successful DP mode testing.

Gallery

KORT-NOZZLE-IS-BEING-OFF-WITH-CHAIN-FALLS
BOTH-KORT-NOZZLES-SHIFTED-TO-WORKSHOP
HORIZONTAL-SHAFT-IS-BEING-REMOVED
PROPELLER-SHAFT-ASSEMBLY
VERTICAL-SHAFTS-AXIAL-CLEARANCE-MEASUREMENT
SHAFT-BEARING-HEATING
PROPELLER-SHAFTS-AXIAL-CLEARANCE-MEASUREMENT
PROPELLER-MOUNTED-ON-SHAFT
KORT-NOZZLE-MOUNTED-BACK

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