Cylinder Covers - Main Engine and Propulsion

Cylinder covers, also called cylinder heads, close the top of marine engine cylinders and contain combustion pressure. They incorporate cooling passages and mount components such as fuel injectors, starting-air valves, indicator cocks, safety valves, and gas-exchange valves as applicable.

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

Last updated: October 11, 2026

Product Information

Product Name	Cylinder Covers
Product Category	Main Engine and Propulsion
Product Reference	2
Brands / Manufacturers	MAN B&W, WinGD, Wärtsilä
Unit of Measure	Piece

Key Features

Key Feature
1. High-strength construction designed for cyclic combustion pressure and thermal loading
2. Internal cooling-water passages control combustion-side temperatures
3. Machined sealing face interfaces with the cylinder liner and sealing rings
4. Accommodates fuel injectors and cylinder-mounted valves
5. Engine-specific design with precision-machined stud holes and component seats

Applications of Cylinder Covers

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

Models & Manufacturers

Model	Manufacturer
G70ME-C	MAN Energy Solutions (MAN B&W)
X62DF	WinGD
Wärtsilä 46F	Wärtsilä

Technical Specifications

Model	Specification	Value	Unit
G70ME-C	Nominal cylinder bore	700	mm
X62DF	Nominal cylinder bore	620	mm
Wärtsilä 46F	Nominal 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	Cylinder covers are manufactured to the engine maker's drawings, material specifications, dimensional tolerances, and pressure-test requirements. Material certification commonly follows EN 10204 Type 3.1 or 3.2 when specified. No universal interchangeable ISO, DIN, ANSI, or API cylinder-cover standard applies.
Class Approval	Acceptance may be required by the vessel's classification society, including DNV, ABS, Lloyd's Register, Bureau Veritas, or ClassNK. Requirements depend on engine criticality, replacement-part origin, material traceability, inspection, pressure testing, and the applicable class rules.

Installation, Maintenance & Safety Information

Installation Notes	Confirm the exact engine type, bore, design version, and cylinder position. Clean and inspect mating faces, renew specified seals, verify valve and injector fit, and tighten hydraulic nuts or studs in the OEM sequence to the prescribed load. Pressure-test cooling spaces where required.
Maintenance Tips	Inspect for combustion-face cracking, burning, corrosion, cooling-space deposits, leakage, distorted sealing faces, and worn valve or injector seats. Clean cooling passages and record crack-test and dimensional results. Observe OEM overhaul intervals and rejection limits.
Safety Notes	Stop and isolate the engine, engage turning-gear interlocks, shut off starting air, and drain and depressurize cooling systems before removal. Use certified lifting tools and the designated lifting points. The cover is heavy and may retain hot fluids or trapped pressure.