06 Mar 2026

Line Boring | Marine & Shipping

Client: Kongsberg Marine and Shipping
Industry: Marine and Shipbuilding
Location: UK
Duration: Completed within several days
Service: Onsite Line Boring services

Overview

Royce Onsite Machining was engaged to perform a critical onsite line boring operation on a marine engine component. Existing sleeves were damaged, risking misalignment and operational inefficiency. The client required a full restoration to OEM specifications while minimizing downtime and avoiding complete disassembly.

Royce removed the damaged sleeves, installed precision-engineered new sleeves, and carried out final machining, removing 10 mm from the bore diameter, bringing it up to the maximum allowable OEM limits, while ensuring alignment and sizing were fully within specification.

Work Carried Out

Damage Assessment

Inspection confirmed worn and damaged sleeves affecting bore alignment.
Non-destructive testing verified the surrounding material was suitable for repair.

Sleeve Removal and Replacement

Existing damaged sleeves were carefully removed on-site.
Precision-engineered replacement sleeves were supplied and installed.

Final Machining and Verification

Line boring and finishing operations removed 10 mm from the bore diameter, restoring the bores to OEM maximum limits.
Alignment was precisely checked and corrected to ensure full compliance with OEM specifications.
Final sizing and surface finish confirmed full operational integrity.

Technical Highlights

Repair Method: Line boring with sleeve removal and installation
Sleeve Type: New precision-engineered replacement sleeves
Material Removed: 10 mm from diameter
Downtime Avoided: Completed within several days
Accuracy: Alignment restored to OEM specification
Verification: Final sizing confirmed compliance with OEM limits

Outcome

The repair was completed on-site within several days, eliminating the need for full component removal or replacement. The bores and sleeves were restored to maximum allowable OEM limits, fully aligned and operational, ensuring reliable performance and minimal downtime.

This project demonstrates Royce Onsite Machining’s ability to carry out high-precision line boring and sleeve replacement, even when operating at the extreme limits of OEM specifications, in marine and shipping applications.

Royce Onsite Machining engineer performing precision onsite line boring to restore marine engine bore alignment and sizing.

Line boring equipment aligned inside marine engine bore during final machining, removing 10mm to reach OEM maximum limits.

Internal view of marine engine housing after sleeve removal, prepared for precision line boring and new sleeve installation.

Onsite line boring machine set up on marine engine component in the UK, restoring damaged sleeves to OEM specification.