Propulsion Shaft Line Boring & Steering Gear Repairs

Precision Shaft Alignment & Line Boring with Proven Onboard Accuracy

KIMI delivers high-precision in-situ line boring and laser alignment services to restore propulsion shafts, stern tubes, and rudder systems to OEM requirements. Using advanced portable line boring equipment, we correct misalignment, wear, and geometric deviations directly onboard, ensuring proper load distribution and reliable operation.

Our in-situ services performed both at sea and in dry dock, cover the complete repair process, from inspection, dimensional verification, and alignment assessment to precision boring, machining, and final restoration of engine bedplate pockets, propulsion shafts, stern tube bores, and steering gear bushes and bearings.

In-situ line boring of stern tube housing during dry docking by KIMI
In-situ line boring of stern tube housings during dry docking to restore alignment and correct bearing fit.
In-situ machining of stern tube housing restoring bore roundness at KIMI
In-situ machining of stern tube housing restoring bore roundness, shaft alignment, and proper bearing fitment.
In-situ machining of propulsion shaft V-bracket during dry docking at KIMI
In-situ machining of propulsion shaft V-bracket during dry docking restoring alignment and bearing fit.
In-situ machining of rudder stock housing for bush fitting by KIMI technicians
In-situ machining of rudder stock housing for accurate bush fitting and alignment
DRAG
Rudder Stock Housing in-situ machining_by kimi technicians_video
In-situ line boring of stern tube housing during dry docking by KIMI
In-situ machining of stern tube housing restoring bore roundness at KIMI
In-situ machining of propulsion shaft V-bracket during dry docking at KIMI
In-situ machining of rudder stock housing for bush fitting by KIMI technicians

Customer Benefits

<h3>Reduced Vessel Downtime</h3>

Reduced Vessel Downtime

<h3>Lower Repair & Logistics Costs</h3>

Lower Repair & Logistics Costs

<h3>Restored Alignment & Load Distribution</h3>

Restored Alignment & Load Distribution

In-Situ Line Boring & Laser Alignment Process

01

Inspection & Alignment Assessment

Measure shaft line, bearing wear, and misalignment

02

Laser Alignment Setup

Establish reference axis and quantify deviations

03

Machine Setup & Centering

Align portable line boring equipment to corrected centerline

04

In-Situ Line Boring

Restore bearing housings to OEM geometry and tolerances

05

Final Verification & Documentation

Laser alignment check, dimensional control, and class reporting

Read the Most Frequently Asked Questions

Why Rely on KIMI

0.01
mm

Alignment Accuracy
Laser-based measurements and machining to OEM tolerances

100
%

In-Situ Execution
No removal of shafting or transport required

15
+

Advanced Portable Machining Systems
Precision line boring in confined onboard environments

Ask For Technical Advice

Beyond Conventional Marine Engine Repairs

We Restore What Others Replace
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FAQs

Yes. KIMI specializes in correcting wear, deformation, and geometric deviations in stern tube and rudder bearing areas through precision in-situ boring, machining, and alignment procedures performed directly onboard. 

Accurate laser alignment ensures proper load distribution across the propulsion shaft line and steering system, reducing vibration, uneven bearing wear, and the risk of premature failure. KIMI uses advanced laser systems capable of achieving alignment accuracy up to 0.01 mm. 

Yes. KIMI delivers a complete end-to-end service, from onboard inspection and troubleshooting to in-situ line boring, laser alignment, machining, bearing restoration, component replacement, and final installation. 

Our integrated approach ensures accurate restoration of propulsion shaft lines, stern tube housings, rudder systems, and CPP components with minimal vessel downtime and full compliance with OEM and classification society requirements.