Piston Crowns - Main Engine and Propulsion

Piston crowns form the upper combustion-facing section of pistons in marine main propulsion engines. They withstand high combustion pressure and temperature and are commonly forged from heat-resistant alloy steel with internal oil-cooling passages.

ProShipWorks provides end-to-end support to source and supply Piston Crowns for marine vessels, ship operators, industrial facilities, maintenance teams and procurement departments.

Last updated: October 11, 2026

Product Information

Product Name	Piston Crowns
Product Category	Main Engine and Propulsion
Product Reference	312
Brands / Manufacturers	MAN Energy Solutions, WinGD, Mitsubishi Heavy Industries
Unit of Measure	Piece

Key Features

Key Feature
1. Heat-resistant forged alloy-steel construction
2. Internal oil-cooling passages for thermal control
3. Machined ring grooves for piston ring installation
4. Combustion-bowl geometry matched to the engine design
5. Engine-specific dimensions and fastening arrangement

Applications of Piston Crowns

Application
1. Low-speed two-stroke marine main propulsion engines
2. Crosshead diesel engine piston overhaul
3. Replacement of worn, cracked, burned, or eroded piston crowns

Models & Manufacturers

Model	Manufacturer
MAN B&W S50ME-C	MAN Energy Solutions
MAN B&W G60ME-C	MAN Energy Solutions
WinGD X52	WinGD
WinGD X62	WinGD
UEC50LSH-Eco	Mitsubishi Heavy Industries

Technical Specifications

Model	Specification	Value	Unit
MAN B&W S50ME-C	Nominal engine cylinder bore	500	mm
MAN B&W G60ME-C	Nominal engine cylinder bore	600	mm
WinGD X52	Nominal engine cylinder bore	520	mm
WinGD X62	Nominal engine cylinder bore	620	mm
UEC50LSH-Eco	Nominal engine cylinder bore	500	mm

Standards, Certifications & Class Approval

Review the available standards and approval information relevant to the product. Actual certification, material traceability, inspection and classification requirements depend on the product type, intended application and purchasing specification.

Applicable Standards & Certification	Manufacture, material certification, inspection and repair must follow the engine designer's specifications and applicable IACS and classification-society machinery rules. Material certificates commonly follow EN 10204 where contractually specified.
Class Approval	Acceptance is engine-, vessel- and survey-specific. Relevant classification societies include DNV, ABS, Lloyd's Register, Bureau Veritas, ClassNK, RINA and CCS. New or reconditioned crowns may require material traceability, NDT records and class survey approval.

Installation, Maintenance & Safety Information

Installation Notes	Confirm engine type, bore, design revision and part number. Inspect mating faces and cooling spaces, renew specified seals and fasteners, verify cooling passage cleanliness, and tighten using the OEM sequence, torque or hydraulic tensioning procedure.
Maintenance Tips	At scheduled overhauls, clean carbon deposits and inspect the combustion surface, ring grooves, cooling passages and fastening areas. Measure wear against OEM limits and perform approved NDT for cracks. Verify cooling-oil flow and pressure after assembly.
Safety Notes	Isolate starting air, fuel, electrical systems and turning gear before work. Allow components to cool, use certified lifting equipment, and follow confined-space procedures when entering the crankcase. Never reuse rejected, cracked or dimensionally out-of-limit crowns.