The smallest low-speed two-stroke engine in WinGD portfolio

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 bulk carriers, product tankers, gas carriers, reefers and feeder container ships operating in deep sea, coastal and inland waters.

The X35-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 operating profile.

It is available in 5-cylinder up to 8-cylinder configuration, covering a power range from 2,450 to 6,960kW at 118 to 167rpm.



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 X35-B and its predecessor W-X35 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 X35-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 X35-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 X35-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 X35-B

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

Rated power, principal dimensions and weights

Output in kw at
167rpm118rpmLength A (mm)Weight (tonnes)
Output in kw at
Cyl.Length A (mm)Weight (tonnes)
Dimensions in mm
B C D E E*
2284 830 5556 1605
F1 F2 F3 G
6850 6900 6450 1326

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 174.8 168.8 174.8 168.8
Part load, % of R1 85 70 85 70 65
Tuning variant Standard Standard Delta Delta Low-load
BSFC 171.2 170.8 170.5 169.3 166.0
Full load, Rating point
BMEP, bar
R1 R1 R3 R4
21.0 16.8 21.0 16.8
Standard Tuning
R1 R1 R3 R4
174.8 168.8 174.8 168.8
Part load, % of R1
Tuning variant
85 70 85 70 65
Standard Standard Delta Delta Low-load
85 70 85 70 65
171.2 170.8 170.5 169.3 166.0


Extent of delivery

Extent of Delivery (EOD)

Modified 09 July 2018


Marine installation manual

Marine Installation Manual (MIM)

Modified 02 November 2018

Installation instructions & concept guidance

Complete Package

Modified 07 May 2018

DG9709 - Instruction and Limits for Engine Alignment

Modified 07 May 2018

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 for Operation on Distillate Fuels

Modified 07 May 2018

DG9723 - Concept Guidance Fuel Oil System

Modified 12 September 2018

DG9723 - Concept Guidance Fuel Oil Treatment

Modified 07 May 2018

DG9726 - Concept Guidance for HP SCR Installation

Modified 07 May 2018

DG9730 - Recommended Fluid Flow Rates vs Velocities

Modified 07 May 2018


Engine or Platform Outline Views

5 Cylinder Engine Execution

Modified 25 September 2018

6 Cylinder Engine Execution

Modified 28 September 2018

Marine Installation Drawing Set (MIDS)

DG9710 - Engine Seating & Foundation

Modified 14 September 2018

DG9710-01 - Tool Engine Alignment

Modified 26 March 2018

DG9715 - Engine stays

Modified 05 October 2018

DG9721 - Cooling Water system

Modified 16 November 2018

DG9722 - Lubricating Oil system

Modified 22 May 2018

DG9723 - Fuel Oil System

Modified 04 October 2018

DG9724 - Leakage Collection & Washing system

Modified 04 October 2018

DG9725 - Starting Air System

Modified 26 March 2018

DG9726 - Exhaust System

Modified 22 May 2018


Modified 05 October 2018


Coupling Flange Crankshaft - Propeller shaft

Modified 26 March 2018

Pipe Connection Plan

5 Cylinder Engine Execution

Modified 25 September 2018

6 Cylinder Engine Execution

Modified 25 September 2018

Engine and System Dynamics



Modified 28 May 2018

Forces + Moments

Forces + Moments

Modified 28 May 2018

Operation & Maintenance


Maintenance Manual

Maintenance Manual (MM)

Modified 11 September 2018

Operation Manual

Operation Manual (OM)

Modified 19 November 2018

Fuel Lubricants Water

Validated Fluids for Engine Operation

Cooling Water and Additives

Modified 24 October 2018

Diesel Fuels

Modified 24 October 2018


Modified 24 October 2018

Over a century of experience

Our Engine History

It all began with Rudolph Diesel and the Sulzer Brothers

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