Crankshafts - Main Engine and Propulsion

A marine crankshaft converts piston reciprocating motion into rotary torque for the propeller or reduction gearbox. Main-engine crankshafts are precision-forged or semi-built components designed for high cyclic, torsional and bending loads.

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

Last updated: October 11, 2026

Product Information

Product Name	Crankshafts
Product Category	Main Engine and Propulsion
Product Reference	12
Brands / Manufacturers	MAN Energy Solutions, WinGD, Wärtsilä
Unit of Measure	Piece

Key Features

Key Feature
1. High-strength forged steel construction
2. Precision-machined main and crankpin journals
3. Oil passages for bearing lubrication
4. Designed for cyclic bending and torsional loads
5. Balanced and matched to the specified engine configuration

Applications of Crankshafts

Application
1. Low-speed two-stroke direct-drive propulsion engines
2. Medium-speed four-stroke geared propulsion engines
3. Diesel-electric propulsion and marine generating engines

Models & Manufacturers

Model	Manufacturer
MAN B&W 6G70ME-C10.5	MAN Energy Solutions
WinGD 6X62DF	WinGD
Wärtsilä 46F	Wärtsilä

Technical Specifications

Model	Specification	Value	Unit
MAN B&W 6G70ME-C10.5	Engine cylinder bore	700	mm
MAN B&W 6G70ME-C10.5	Engine piston stroke	3256	mm
WinGD 6X62DF	Engine cylinder bore	620	mm
WinGD 6X62DF	Engine piston stroke	2658	mm
Wärtsilä 46F	Engine cylinder bore	460	mm
Wärtsilä 46F	Engine piston stroke	580	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	Crankshaft design and manufacture are generally assessed under IACS UR M53 and the applicable classification society rules for reciprocating internal-combustion engines. Material certificates, forging records, heat-treatment records, dimensional reports and nondestructive examination documentation are normally required.
Class Approval	Crankshaft drawings, strength calculations, materials and manufacturing inspections may be approved or surveyed by DNV, ABS, Lloyd's Register, Bureau Veritas, ClassNK, RINA or another vessel-recognized classification society. Approval is engine-, manufacturer- and vessel-specific.

Installation, Maintenance & Safety Information

Installation Notes	Verify the exact engine type, cylinder count, rotation and serial number. Follow the engine maker's procedures for lifting, alignment, bearing clearances, axial clearance, coupling fit, lubrication and tightening. Record crankshaft deflections before and after installation.
Maintenance Tips	Regularly measure crankshaft deflection and bearing clearances, inspect journals and fillets for scoring or cracks, analyze lubricating oil, verify oil pressure and inspect thrust bearings. Use approved polishing or repair limits and perform NDT when required by the maker or class.
Safety Notes	Isolate starting air, fuel, electrical and turning systems before work. Engage the turning-gear interlock, secure moving components and use certified lifting equipment. Crankshafts are extremely heavy; follow an engineered lifting plan and never enter the crankcase until ventilation and safety checks are complete.