4-Stroke Marine Diesel Engines Overhauling
From Vessel to Workshop Complete Marine Engine Reconditioning Solutions
The reliability of 4-stroke marine diesel engines is critical for safe and efficient vessel operation. KIMI specializes in onboard overhauling and precision reconditioning of 4-stroke engines from leading OEMs including MAN, MTU, Yanmar, Wärtsilä, Pielstick and other major Makers.
With over 40 years of marine engineering expertise, advanced workshop infrastructure, heavy-duty machining capabilities, KIMI delivers OEM-grade overhaul, repair, and performance optimization for all major engine components . Our scope includes cylinder cover reconditioning, piston and ring groove restoration, connecting rod reconditioning, and bearing manufacturing. All repairs are executed under strict dimensional and metallurgical control to maximize engine reliability, efficiency, and service life under demanding operating conditions and IMO enviromental regulations.
Customers Benefits
Reduced Vessel Downtime
Cost-Effective Engine Lifecycle Management
Reliable Engine Performance
Our 4-stroke Engines Overhauling & Reconditioning Services:
FAQs
We provide complete reconditioning of key engine components, including:
- Cylinder covers (valves & seats reconditioning)
- Pistons (including groove restoration via laser cladding)
- Cylinder liners (honing & restoration)
- Connecting rods (precision grinding)
- Crankshafts (grinding & build-up)
- Camshafts (advanced reconditioning)
- Bearings (custom manufacturing & fitting)
KIMI is a true end-to-end service provider for 4-stroke marine engines, covering everything from onboard dismantling, inspection, and reconnection to in-house precision reconditioning.
Even in severe cases such as crankshaft journal and bedplate pocket failures, KIMI delivers proven and fast repair solutions. Our riding teams operate worldwide, handling even complex tasks such as crankshaft replacement onboard, while our state-of-the-art workshop ensures fast, OEM-standard reconditioning of components like covers, pistons, liners, and crankshafts.
Yes. KIMI has extensive expertise in 4-stroke crankshaft replacement and repair, both onboard and in-house.
We are approved by Bureau Veritas (BV) for the restoration of crankshafts using advanced laser cladding, allowing damaged journals to be rebuilt back to nominal dimensions in full compliance with class requirements.
All precision grinding operations are carried out in-house, with the capability to handle crankshafts of up to 7 meters in length, ensuring strict quality control, fast turnaround, and OEM-standard accuracy.
This enables KIMI to provide reliable solutions even in cases of severe crankshaft damage, minimizing downtime and avoiding costly replacements where possible.
KIMI has extensive hands-on experience in the overhaul and reconditioning of a wide range of 4-stroke marine engines from leading manufacturers. Our portfolio includes, but is not limited to, the following engine types:
- MAN: 23/30, 28/32, 32/40
- HIMsen: 21/32
- Yanmar: 18, 22
- Daihatsu: 22, 28
- Wärtsilä, MTU, Mitsubishi, Ruston, Pielstick (various models)
This broad experience enables KIMI to deliver reliable, OEM-standard overhaul solutions across multiple engine platforms and configurations.
