Pistons - Main Engine and Propulsion

Marine engine pistons transmit combustion pressure through the connecting rod or piston rod to produce propulsion power. Large two-stroke crosshead engines typically use composite pistons with steel crowns, while medium-speed trunk-piston engines use designs specified by the engine OEM.

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

Last updated: October 11, 2026

Product Information

Product Name	Pistons
Product Category	Main Engine and Propulsion
Product Reference	3
Brands / Manufacturers	MAN Energy Solutions, WinGD, Wärtsilä
Unit of Measure	Piece

Key Features

Key Feature
1. Heat-resistant crown designed for high combustion pressure and temperature
2. Precision-machined ring grooves for gas sealing and oil control
3. Oil-cooled or water-cooled construction depending on engine design
4. Wear-resistant running surfaces and replaceable piston rings
5. Manufactured to engine-specific dimensions, clearances and material requirements

Applications of Pistons

Application
1. Low-speed two-stroke marine main propulsion engines
2. Medium-speed four-stroke propulsion engines
3. Marine diesel-electric propulsion and auxiliary engines

Models & Manufacturers

Model	Manufacturer
Piston for MAN B&W G60ME-C engine series	MAN Energy Solutions
Piston for X62 engine series	WinGD
Piston for Wärtsilä 46F engine series	Wärtsilä

Technical Specifications

Model	Specification	Value	Unit
MAN B&W G60ME-C engine series piston	Compatible engine cylinder bore	600	mm
WinGD X62 engine series piston	Compatible engine cylinder bore	620	mm
Wärtsilä 46F engine series piston	Compatible engine cylinder bore	460	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	Pistons are manufactured and inspected to engine-OEM drawings, material specifications and approved quality procedures. Material inspection certificates may follow EN 10204 Type 3.1 or 3.2 when contractually required. Applicable requirements depend on the engine maker, vessel class and replacement-part approval basis.
Class Approval	Acceptance may be required by the vessel's classification society, such as DNV, ABS, Lloyd's Register, Bureau Veritas or ClassNK. Main-engine pistons are generally approved as engine components through design review, material certification, inspection and survey rather than universal standalone type approval.

Installation, Maintenance & Safety Information

Installation Notes	Confirm engine type, bore, build number and OEM part number. Measure piston, liner and ring clearances; install rings in the specified orientation with staggered gaps. Use approved lifting tools, lubricants, tightening values and piston-cooling connections specified by the engine maker.
Maintenance Tips	Inspect the crown for burning, cracking and deposits; check ring grooves, skirt, piston rod, securing hardware and cooling spaces. Measure wear and clearances at scheduled overhauls, verify cooling-oil flow, renew rings as specified and retain dimensional records for trend monitoring.
Safety Notes	Stop and isolate the engine, engage turning-gear interlocks, depressurize starting air and allow components to cool. Use certified lifting equipment because pistons are heavy. Follow confined-space procedures for crankcase entry and perform required crankcase inspections before restart.