Designed with vessel efficiency and environmental friendliness in mind

EEDI regulations, low vessel emissions, and operational flexibility have been key considerations in designing the X72-B as the preferred engine for new merchant vessels. The new engine offers high levels of propulsion efficiency resulting from its lower engine revolutions. The wide rating field presents increased flexibility for selecting the most efficient propeller speed, thus giving minimised daily fuel consumption, by using the appropriate propeller diameter for the projected ship design and mission profile. For vessels with draught restrictions affecting the propeller diameter, a higher propeller speed can be selected. This, together with the favourable piston dismantling height, makes this engine very attractive for Suezmax tankers, Capesize bulk carriers, as well as Panamax and Sub-Panamax container vessels.

This low-speed marine diesel engine with 720mm cylinder bore is available in 5- up to 8-cylinder configuration, covering a power range from 10,600 to 31,360kW at 66 to 89rpm.


WinGD’s well proven electronically-controlled common-rail technology plays a key role in enabling ship owners to reduce fuel costs, mainly through the flexibility of the fuel injection and exhaust valve operations. This flexibility results in lower fuel consumption across the entire operating range, especially at low and part loads. In addition, different engine tunings (Standard, Delta, Delta By-Pass and Low Load) are available in order to meet specific customer requirements. Intelligent Combustion Control (ICC) system enables further fuel savings and balanced working of each cylinder.

The engine is fully compliant with IMO Tier III NOx emission levels when equipped with a SCR catalyst system. The introduction of the EEDI index also puts an emphasis on CO2 emissions and total vessel efficiency. The X72’s internal engine and propulsion efficiencies, and the possibility to apply various Power Take-Off (PTO) arrangements for on-board electricity production, makes it easier for shipyards to meet these new requirements. Waste Heat Recovery (WHR) offers further possibilities for maximising energy efficiency and for reducing emissions.


All areas of lifecycle costs have been taken into account for the X72-B. The selected stroke-to-bore ratio makes the engine compact and has a positive impact on the manufacturing and component cost. The X72-B is designed for exceptional reliability and for long periods of maintenance-free operation. It also allows extended Time Between Overhaul (TBO) of the critical components, to as much as 5 years. The service-friendly design will reduce downtime, maintain vessel operation, and cut operating costs. Together with Condition Based Maintenance (CBM) and service agreements, the overhaul interval could be even further extended, thus minimising maintenance costs and maximising the revenue-earning capability of the vessel.


All Generation X engines can be converted to use LNG as fuel. For simplifying the future conversion WinGD has introduced the DF-ready version as an option. The DF-ready engines can be easily converted to dual-fuel, as no major structural components need to be modified. All parts, which are to be replaced at a later conversion, are either typical wear parts or specific X-DF components and systems. DF-ready version is the recommended solution for LNG-ready ships.

All data provided on this site is for information purposes only, explicitly non-binding and subject to changes without further notice.

Basic Engine Data

Technical Information

WinGD X72-B

IMO Tier II/Tier III (SCR)
Cylinder bore
Piston stroke
66-89 rpm
Mean effective pressure at R1
21.0 bar

Rated power, principal dimensions and weights

Output in kW at
84 rpm66 rpmLength A (mm)Weight (t)
Output in kW at
84 rpm66 rpm
Cyl.Length A (mm)Weight (t)
Dimensions in mm
B C D E E*
4780 1575 10790 4710
F1 F2 F3 G
13655 13655 12730 2455

Brake specific fuel consumption (bsfc) in g/kWh

Full load, Rating point R1 R2 R3 R4
BMEP, bar 21.0 15.4 21.0 15.4
BSFC Standard Tuning 166.8 159.3 166.8 159.3
Part load, % of R1 85 70 85 70 65
Tuning variant Standard Standard Delta Delta Low-load
BSFC 163.2 162.8 162.5 161.3 157.3
Full load, Rating point
BMEP, bar
R1 R1 R3 R4
21.0 15.4 21.0 15.4
Standard Tuning
R1 R1 R3 R4
166.8 159.3 166.8 159.3
Part load, % of R1
Tuning variant
85 70 85 70 65
Standard Standard Delta Delta Low-load
85 70 85 70 65
163.2 162.8 162.5 161.3 157.3




Marine installation manual

Marine Installation Manual (MIM)

Published 11 June 2020

Usual Values and Safeguard Settings

Published 13 September 2019

Installation instructions & concept guidance

DG9726 - Concept Guidance for HP SCR TC PROTECTION

Published 12 July 2019

Complete Package - coventional engines

Published 16 November 2020

DG9710 - Engine Seating/Foundation Fitting Instruction

Modified 02 February 2021

DG9715 - Assembly Instruction WinGD Friction Type Stays

Modified 02 February 2021

DG9715 - Assembly Instruction WinGD Single Acting Hydraulic Type Stays

Modified 07 May 2018

DG9721 - Concept Guidance for Fresh Water Generation

Modified 07 May 2018

DG9722 - Flushing Instruction for Lubricating Oil System

Published 16 November 2020

DG9723 - Concept Guidance Fuel Oil Treatment

Modified 07 May 2018

DG9723 - Concept Guidance for Operation on Distillate Fuels

Published 10 October 2019

DG9723 - Concept Guidance Fuel Oil System

Modified 12 September 2018

DG9730 - Various Installation Items

Published 30 September 2020

Assembly and Testing Template

Assembly and Testing Template

Record sheet for CWD measurements on testbed

Published 16 September 2020


Engine or Platform Outline Views

5 Cylinder Engine Execution

Published 21 July 2020

6 Cylinder Engine Execution

Published 21 July 2020

Marine Installation Drawing Set (MIDS)

DG9710 - Engine Seating & Foundation

Published 14 October 2020

DG9715 - Engine stays

Published 20 May 2021

DG9710-01 - Tool Engine Alignment

Published 14 October 2020

DG9721 - Cooling Water system

Published 30 March 2021

DG9722 - Lubricating Oil system

Published 20 May 2021

DG9723 - Fuel Oil System

Published 01 October 2020

DG9724 - Leakage Collection & Washing system

Modified 08 September 2020

DG9726 - Exhaust System

Published 08 September 2020

MIDS complete package

Published 20 May 2021

DG9725 - Air Supply System

Modified 02 February 2021


Coupling Flange Crankshaft - Propeller shaft

Modified 29 May 2018

Pipe Connection Plan

6 Cylinder Engine Execution

Published 24 May 2021

Engine and System Dynamics


Excitations Files

Published 09 June 2021

Radial Mass Excitations

Published 28 May 2020

Tangential Mass Excitations

Published 28 May 2020

Harmonic Combustion Excitations

Published 09 June 2021


Vibration Standards and Limits - Marine

Published 17 February 2020

Torsional Vibration Calculation (TVC) - Marine

Published 28 May 2020

Torsional Vibration Calculation (TVC) OD-Shaft - Marine

Published 28 May 2020

Axial Vibration Calculation (AVC) - Marine

Published 17 February 2020

Whirling Vibration Calculation (WVC) - Marine

Published 17 February 2020

Torsional Vibration Calculation (TVC) - Testbed

Published 17 February 2020


AV Limits for Crankshafts

Published 09 June 2021

TV Limits for Crankshafts

Published 19 July 2021

Maximum possible speed in case of one cylinder not firing

Published 12 June 2019

Maximum inertia of tuning wheels

Published 03 December 2020


Low TV Tuning

Modified 05 June 2018


Entrained Water of Propellers

Published 12 June 2019

Propeller Damping

Published 12 June 2019


Information Release for Visual TORSVIB

Modified 03 December 2020

TORSVIB Software Brochure

Modified 05 June 2018



Published 13 February 2019

Forces + Moments

Forces + Moments

Published 13 February 2019



Published 09 June 2021

Engine Alignment

Measurement Record Sheets

Record sheet for CWD+JUT measurements on the ship

Published 16 September 2020

Record sheet for CWD measurements on testbed

Published 16 September 2020

Instructions and Limits

Instructions and Limits - Documents Overview

Published 16 July 2021

Instruction Marine Propulsion

Published 16 July 2021

Guidelines for Layout Calculation

Published 03 June 2019

Guidelines for Alignment Process

Published 03 June 2019

Guidelines for Measurements

Published 03 June 2019

Operation & Maintenance


Maintenance Manual

Maintenance Manual (MM)

Published 17 August 2020

Operation Manual

Operation Manual (OM)

Published 16 July 2020

Spare Parts Catalogue

Spare Parts Catalogue

Published 26 June 2020

Fuel Lubricants Water

Validated Fluids for Engine Operation

Cooling Water and Additives for WinGD engines - V4

Published 11 May 2021

Diesel Fuels for WinGD engines - V2

Published 21 December 2018

Lubricants for WinGD engines - V8

Published 14 April 2021

Validated Engine Oils for WinGD engines - V9

Published 26 March 2021

WinGD_TIN011_IMO 2020 operation guideline

Published 20 May 2019

Technical Updates

Technical Information Note

WinGD_TIN001_Light running margin

Published 01 June 2015


Published 01 November 2015

WinGD_TIN006-1_Impact back pressure EH treatment systems

Published 01 February 2019

WinGD_TIN006-2_Impact back pressure EH treatment systems

Published 27 May 2019

WinGD_TIN011_IMO 2020 operation guideline

Published 20 May 2019

WinGD_TIN012_CPP 17 percentage limit

Published 12 September 2019

WinGD_TIN014_iSCR introduction

Published 06 November 2019


Published 02 December 2019


Published 18 June 2020

Who is WinGD

About WinGD

Headquartered in Switzerland, powering merchant shipping since 1893