Marine low-speed engine providing excellent fuel consumption features and operational flexibility

Designed for vessels with shallow draught requirements, compact engine room dimensions and simple engine operation it is highly suited for both fixed pitch- and controllable pitch- propellers direct-drive propulsion of a wide range of small and medium-sized cargo vessels. Possible applications covers chemical and product tankers, bulk carriers, container feeders, reefers and gas carriers operating in deep sea, coastal and inland waters.

The X40-B is an electronically controlled, common rail marine low-speed engine which can be classed as one of the most efficient in its category and offers fuel consumption benefits up to 3% compared to a conventional mechanical main engine, depending on the sailing profile.

Available in 5-cylinder up to 8-cylinder configuration, covering a power range from 3,250 to 9,080kW at 104 to 146rpm.



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 timing control. The X40-B and its predecessor X40 are even more flexible in shaping the injection pattern due to electronically controlled fuel injectors. In addition, different engine tunings (Standard, Delta, Delta By-Pass and Low Load) are available in order to meet specific customer requirements. The engines can be additionally equipped with Intelligent Combustion Control (ICC) system enabling further fuel savings and automatic balancing of each cylinder load.

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 internal engine efficiency of X40-B, and the possibility to apply various Power Take-Off (PTO) arrangements for on board electricity production, make it easy for shipyards to meet these new requirements.


The X40-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 may be even further extended, thus minimising maintenance costs and maximising the revenue-earning capability of the vessel.

The Interactive Engine Room Simulator (W-Xpert) available for operators is based on the X40-B main engine and Wärtsilä auxiliary engines, allowing efficient training and self-education of the Crew.

 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 X40-B

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

Rated power, principal dimensions and weights

Output in kw at
146rpm104rpmLength A (mm)Weight (tonnes)
Output in kw at
Cyl.Length A (mm)Weight (tonnes)
Dimensions in mm
B C D E E*
2610 950 6344 1647
F1 F2 F3 G
7750 7860 7400 1411

Brake specific fuel consumption (bsfc) in g/kWh

Full load, Rating point R1 R2 R3 R4
BMEP, bar 21.0 16.8 21.0 16.8
BSFC Standard Tuning 173.8 167.8 173.8 167.8
Part load, % of R1 85 70 85 70 65
Tuning variant Standard Standard Delta Delta Low-load
BSFC 170.2 169.8 169.5 168.3 165.0
Full load, Rating point
BMEP, bar
R1 R1 R3 R4
21.0 16.8 21.0 16.8
Standard Tuning
R1 R1 R3 R4
173.8 167.8 173.8 167.8
Part load, % of R1
Tuning variant
85 70 85 70 65
Standard Standard Delta Delta Low-load
85 70 85 70 65
170.2 169.8 169.5 168.3 165.0


Extent of delivery

Extent of Delivery (EOD)

Modified 28 January 2019


Marine installation manual

Marine Installation Manual (MIM)

Modified 09 January 2019

Installation instructions & concept guidance

Complete Package - coventional engines

Published 10 October 2019

DG9710 - Engine Seating/Foundation Fitting Instruction

Modified 07 May 2018

DG9715 - Assembly Instruction WinGD Friction Type Stays

Modified 28 May 2018

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

Modified 07 May 2018

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

DG9726 - Concept Guidance for HP SCR Installation

Modified 07 May 2018

DG9730 - Recommended Fluid Flow Rates vs Velocities

Published 26 September 2019


Engine or Platform Outline Views

5 Cylinder Engine Execution

Published 16 May 2019

6 Cylinder Engine Execution

Published 16 May 2019

Marine Installation Drawing Set (MIDS)

DG9710 - Engine Seating & Foundation

Published 17 July 2019

DG9710-01 - Tool Engine Alignment

Published 03 October 2019

DG9715 - Engine stays

Modified 05 October 2018

DG9721 - Cooling Water system

Modified 13 December 2018

DG9722 - Lubricating Oil system

Published 26 September 2019

DG9723 Fuel Oil system

Modified 04 October 2018

DG9724 - Leakage Collection & Washing system

Published 16 September 2019

DG9725 - Starting Air System

Modified 15 January 2019

DG9726 - Exhaust System

Published 16 September 2019

MIDS complete package

Published 03 October 2019


Coupling Flange Crankshaft - Propeller shaft

Modified 17 July 2019

Pipe Connection Plan

5 Cylinder Engine Execution

Published 16 May 2019

6 Cylinder Engine Execution

Published 16 May 2019

Engine and System Dynamics


Coupled Axial Vibration Calculation

Published 12 June 2019

Torsional Vibration OD-Shaft

Published 12 June 2019

Torsional Vibration Calculation Marine Installation

Published 12 June 2019

Vibration Standards and Limits

Modified 24 June 2019

Whirling Vibration

Published 12 June 2019


Acceptable vibration levels and standard measurement points

Published 12 June 2019



Modified 28 May 2018

Forces + Moments

Forces + Moments

Modified 28 May 2018

Engine Alignment

Measurement Record Sheets

Record sheet for CWD+JUT measurements on the ship

Modified 23 September 2019

Instructions and Limits

Instructions and Limits - Documents Overview

Published 24 June 2019

Instruction Marine Propulsion

Published 24 June 2019

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)

Modified 11 May 2018

Operation Manual

Operation Manual (OM)

Modified 11 May 2018

Fuel Lubricants Water

Validated Fluids for Engine Operation

Cooling Water and Additives for WinGD engines - V2

Published 04 January 2019

Diesel Fuels for WinGD engines - V2

Published 21 December 2018

Lubricants for WinGD engines - V3

Published 18 March 2019

WinGD_TIN011 IMO 2020 Operation Guideline

Published 20 May 2019

Technical Updates

Technical Information Note

WinGD_TIN001 Light_running_margin

Published 01 June 2015

WinGD_TIN003 Steam-production-control-(SPC)

Published 01 November 2015

WinGD_TIN006-1 Impact-back-pressure-EH-treatment-systems

Published 01 February 2019


Published 27 May 2019

WinGD_TIN011 IMO 2020 Operation Guideline

Published 20 May 2019

Get in touch

Contact us

We'd love to hear from you. You can reach us here.

Visit page