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


Extent of delivery

Extent of Delivery (EOD)

Modified 28 January 2019


Marine installation manual

Usual Values and Safeguard Settings

Published 13 October 2021

Marine Installation Manual (MIM)

Published 26 August 2022

Installation instructions & concept guidance

DG9726 - SPECIFICATION waste gate selection

Published 14 March 2022

Complete Package - coventional engines

Published 11 November 2022

DG9710 - Engine Seating/Foundation Fitting Instruction

Published 11 November 2022

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)

MIDS complete package

Published 23 January 2023

DG9710 - Engine Seating & Foundation

Published 08 September 2020

DG9710-01 - Tool Engine Alignment

Published 10 January 2023

DG9715 - Engine stays

Published 23 January 2023

DG9721 - Cooling Water system

Published 30 March 2021

DG9722 - Lubricating Oil system

Published 05 January 2023

DG9723 Fuel Oil system

Published 01 October 2020

DG9724 - Leakage Collection & Washing system

Published 16 September 2019

DG9725 - Air Supply System

Published 01 November 2021

DG9726 - Exhaust System

Published 16 September 2019


Coupling Flange Crankshaft - Propeller shaft

Modified 17 July 2019

Pipe Connection Plan

5 Cylinder Engine Execution

Published 23 May 2021

6 Cylinder Engine Execution_Pipe Connection Plan

Published 31 October 2022

Engine and System Dynamics


Excitations Files

Published 25 March 2022

Radial Mass Excitations

Published 28 May 2020

Tangential Mass Excitations

Published 28 May 2020

Harmonic Combustion Excitations

Published 25 March 2022


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 08 March 2022

TV Limits for Crankshafts

Published 11 May 2022

Maximum possible speed in case of one cylinder not firing

Published 12 June 2019

Maximum inertia of tuning wheels

Published 08 March 2022


Low TV Tuning

Published 16 November 2021


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



Modified 28 May 2018

Forces + Moments

Forces + Moments

Modified 28 May 2018



Published 08 March 2022

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

Manuals & Templates

Operation Manual

Operation Manual (OM)

Published 11 November 2020

Maintenance Manual

Maintenance Manual (MM)

Published 15 March 2022

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 - V12

Published 15 November 2022

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


Published 02 December 2019


Published 24 October 2022


Published 18 June 2020


Published 18 January 2022


Published 22 December 2022


Published 22 August 2022


Published 22 August 2022


Published 08 December 2022

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