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Weichai WP4.1 Marine Diesel Engine Series (40-60kW)


Product Profile

Weichai WP4.1 marine diesel engine series is the newly developed high-speed engine based on marine engine user behavior and working conditions, relying on Weichai’s 70 years of research and development experiences and introduction of advanced technology from home and abroad. The engine has a power of 40-60kW, compact structure, reliable operating, strong power, good economy, simple operation and convenient maintenance. The engine is developed according to the application status of similar products in the market. It is an ideal choice of power for small-sized offshore and inland river transport vessels, fishing boats and official business boat.

Product parameters

Series  4-Stroke、water cooling、In-Line、Dry cylinder sleeve

Number of cylinders

Cylinder Diameter/Stroke  105×118mm


specific lub-oil consumption  0.6g/kW·h

Crankshaft rotation direction
(towards free end)

Start Mode  Electric start


Firing Order  1-3-4-2 Smoke intensity ≤1.5Rb
Noise  ≤112dB(A) Emission standard IMO TIER II

Product Spectrum


Air intake

Rated Power(kW/Ps) Speed(r/min)
WP4.1C54-15 Turbocharge non-intercooled 40/54 1500
WP4.1C68-15 Turbocharge non-intercooled 50/68 1500
WP4.1C82-18 Turbocharge non-intercooled 60/82 1800

Remarks: Product parameters and portfolio are for reference only. For fishing vessel engine portfolio, please contact relevant personnel for official information.

Product Features

  • Safe and reliable: High-strength engine body, crankshaft and connecting rod; integral cylinder head;


  • Strong power: Sufficient torque reserve, excellent ship acceleration performance, and suitable for various working conditions;


  • Cost-efficient and fuel-saving: Large-swirl-ratio throat ω-shaped combustion chamber improves the premixed fuel for good economic performance and clean smoke;


  • Practical: Closed dual-cycle cooling system and large-flow sea water pump to ensure cooling capacity; real-time monitoring of water temperature, oil pressure and other parameters, with start, over-limit alarm and shutdown.


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