July 09, 2024

Advanced 4-Stroke Engine Spares Reconditioning for MAN, Wärtsilä, MTU, Yanmar & Daihatsu Engines

40+ Years of Expertise: KIMI Delivers OEM-Level 4-Stroke Engine Reconditioning Solution

KIMI offers a complete, one-stop solution for 4-stroke engine spares reconditioning and lifecycle extension. With more than 40 years of marine engineering expertise, the company combines ultrasonic cleaning, precision grinding, laser cladding, machining, inspection, and advanced restoration technologies under one roof. Supporting MAN, Wärtsilä, MTU, Yanmar, and Daihatsu engines, the integrated workshop combines advanced restoration technologies and engineering expertise to extend component life and restore OEM-level performance.

Machining of pockets and valve seats during 4-stroke cylinder cover reconditioning at KIMI’s precision workshop.

Cylinder Head Reconditioning Scope

  • Ultrasonic cleaning, ensuring clean surfaces even in hard-to-reach areas
  • Inspection measurements by Level II PCN-certified personnel, including a spring elongation check
  • Renewal of seats, valves, guides, and injector sleeve
  • Grinding of the cover in the way of the liner’s landing surface
  • Hydraulic pressure testing

KIMI offers two repair solutions for exhaust valve seat pockets, tailored to the client’s requirements and the component’s condition:

Option A: High-precision grinding with industry-leading accuracy and surface finish

  • Geometrical precision without chatter marks or undulations
  • Unparalleled precision of grinding seat circularity, less than 0.003mm
  • Surface roughness ≤0.4 Ra
  • Grinding capability in seat diameter ranging from 13–250mm

Option B: Laser Cladding in Exhaust Pockets and cooling jacket groove

  • Restoration of exhaust seat pockets to the original standard OEM dimensions.
  • Avoidance of oversized seats and special spare parts.
  • Extension of cylinder cover service life.
  • Recovery of worn cooling jacket grooves and sealing surfaces.
  • Cost-effective alternative to cylinder cover replacement.
Grinding of pockets and valve seats during 4-stroke cylinder cover reconditioning at KIMI’s workshop.
Precision grinding of pockets and seats during 4-stroke cylinder cover reconditioning to restore sealing integrity and OEM dimensional specifications.
Precision grinding of valve seats and pockets on MAN B&W 27/38 cylinder cover at KIMI
Advanced reconditioning process on a MAN B&W 27/38 4-stroke cylinder cover, including precision grinding of the valve seat and pockets.
Laser cladding restoring the top ring groove of a 4-stroke piston crown at KIMI’s precision workshop.
Laser cladding rebuilds the top ring groove of the 4-stroke piston crown, restoring wear surfaces and geometry to OEM standards.
Laser cladding reconditioning of 4-stroke piston grooves at KIMI
Laser cladding on 4-stroke piston grooves restoring OEM dimensions and piston ring operability with minimal heat input.
Final dimensional measurement of 4-stroke connecting rod big bore at KIMI
Final dimensional inspection of a 4-stroke connecting rod to verify OEM compliance.
Precision grinding of 4-stroke connecting rod bore at KIMI engineering workshop
Precision grinding restores bore diameter to OEM specifications, correcting ovality and achieving the required surface finish
Precision honing of 4-stroke cylinder liner restoring OEM crosshatch pattern at KIMI
Precision honing through dedicated machinery restores the OEM crosshatch pattern, ensuring controlled oil retention and proper lubrication conditions.

Connecting Rod Restoration By Precision Grinding

  • Magnetic particle inspection (MPI / Magnaflux testing) for crack detection by Level II PCN-certified personnel
  • Restoration of the big end bore by an advanced CNC grinding machine
  • Lapping of tooth
  • Issuance of a detailed inspection and measurement report.

Pistons’ Grooves Restoration By Laser Cladding

  • Inspection and dimensional assessment of piston grooves.
  • Removal of worn and damaged material from ring groove areas.
  • Laser cladding restoration of groove areas to the nominal size
  • Machining of restored grooves to OEM dimensions and tolerances.
  • Final dimensional inspection and quality control verification.

Liner Honing

  • Ultrasonic Cleaning
  • High precision honing of any cylinder liner bore up to 600mm
  • NDT inspection by Level II PCN-certified personnel
  • Issuance of a detailed inspection and measurement report.

Key Benefits:

One-Stop Service Hub

All repair, machining, laser cladding, inspection, testing, and certification services are performed under one roof.

Guaranteed Quality

Repairs carried out by certified personnel using advanced equipment and comprehensive quality documentation.

Cost-Effective Solution

Extends component service life and reduces replacement costs through advanced reconditioning and restoration.

Long-Term Reliability

Durable repair solutions designed to restore OEM performance and maximize component lifespan

Connecting Rod Restoration
Liner Honing
4-Stroke Cylinder Heads Overhaul & Repair
4-Stroke Piston Repair

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