Cylinder Head Reconditioning
Advanced Cylinder Head Reconditioning with Precision Grinding, Laser Cladding & Ultrasonic Technology
With decades of expertise in 4-stroke marine engines, KIMI delivers specialized cylinder head reconditioning services for MAN B&W, Yanmar, Mitsubishi, MTU, and other leading OEMs. Utilizing advanced CNC grinding, and Laser Cladding technologies, we restore worn or damaged cylinder heads to OEM specifications, maximizing service life, operational reliability, and engine performance.
For critically damaged components, advanced repair techniques restore them to zero-hour condition. Common failures include cracks on combustion surfaces and corrosion in O-ring grooves.
KIMI delivers precise, OEM level, class-compliant repairs within optimized turnaround times, minimizing vessel downtime while ensuring durability, structural integrity, and long-term operational reliability.
Customer Benefits
Minimized Vessel Downtime
Cost-Effective Component Recovery
Extended Service Life
Cylinder Head Overhaul Process
ULTRASONIC CLEANING
Removes deposits from complex geometries and inaccessible areas, ensuring surface cleanliness
INSPECTION & MEASUREMENTS
PCN Level II personnel perform dimensional checks including spring elongation and critical tolerance verification
SEAT & COMPONENT RESTORATION
Seats, valves, guides, and sleeves are restored to OEM standards, ensuring geometric accuracy and operational performance
PRECISION GRINDING
Seats and valves are ground to achieve tight tolerances and leak-tight sealing conditions
CNC MACHINING OF SEAT POCKETS
Seat pockets are machined using dedicated high-precision grinding equipment of the latest technology for this application
LASER CLADDING RECONDITIONING
Valve pockets and cracks are treated using controlled heat input ensuring metallurgical bond integrity
LINER LAPPING SURFACE GRINDING
Cylinder head surfaces are machined to achieve flatness and proper liner contact conditions
PRESSURE TESTING
Hydrostatic testing verifies sealing integrity under operating conditions
View More Services
Case Studies & News
FAQs
A complete overhaul includes disassembly, inspection, cleaning, and measurement of all critical components, followed by replacement of worn parts and reassembly. Repairs include pocket restoration using laser cladding, cooling jacket groove repair, and precision grinding to restore components to OEM specifications.
KIMI undertakes overhaul of 4-stroke marine cylinder heads from major engine makers such as MAN Energy Solutions, Wärtsilä, Caterpillar / MaK, and Hyundai Heavy Industries (HiMSEN engines)
Laser cladding is an advanced repair method where a high-performance alloy is bonded onto worn areas to restore original geometry and improve durability.
In 4-stroke marine cylinder heads, it is mainly used to restore:
• Exhaust valve pockets to standard size, allowing use of standard-size seats
• Cooling jacket grooves
This ensures proper installation, prevents leakage, and extends component life.
Ultrasonic cleaning is a highly effective method for deep cleaning cylinder cover components. It uses high-frequency sound waves to remove carbon deposits, oil residues, and contaminants—even from hard-to-reach areas like internal passages and cooling channels.
Compared to traditional cleaning methods, it provides deeper, more uniform, and non-destructive cleaning. KIMI applies ultrasonic cleaning in 4 stroke marine heads to ensure consistently high-quality results, preparing components for accurate inspection, repair, and reassembly.
Yes, KIMI carries out all valve seat and valve reconditioning in-house using one of the most advanced grinding machines available. This ensures high precision, perfect sealing, and restoration to OEM standards for optimal engine performance.