Marine Diesel Engine

WP12 350-450 HP Diesel Engine

The Weichai WP12 350–450 HP Marine Diesel Engine offers powerful and efficient propulsion for medium to large marine vessels. It features individual cylinder heads with honed liners, spin‑on and duplex oil filters, fresh‑water cooled lubrication, plate‑type oil coolers, and a P‑type inline injection pump. Duplex fuel filters, high‑quality heat exchanger, corrosion-resistant metallic paint, and a deep oil sump ensure durability, reliability, and low maintenance in challenging marine conditions.

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SALIENT FEATURES

Individual cylinder heads with honed liners

Spin-on type and duplex type oil filers

Fresh water-cooled lube and plate type oil coolers

Simple P-type inline injection pump

Duplex fuel filters fitted with water separator

High quality heat exchanger with expansion tanks

Five layers special metallic paint for long life against corrosion

High quality rubber hoses & clamps

Deep oil sump-extra operational care

TECHNICAL INFORMATION

Specification

Engine Model	WP12C350-18	WP12C450-21
Rated power (hp)	350	450
Rated power (kw)	257	330
Rated speed (rpm)	1800	2100
Rotating direction (Facing flywheel end)	Anticlockwise
Bore X Stroke (mm)	126 x 155
Displacement (L)	11.59
No. of Cylinders	6 — Inline
Aspiration	Turbochraged Aftercooled
Power output size	SAE 1/14
Compression ratio	17:01
Emission standard	IMO Tier II
Certification	IRS/CCS/BV

Lubrication System

Oil sump capacity (L)

Fuel System

Injection pump type/Standard configuration

Mechanical pump

Electrical system

Starting system voltage

24V DC

Cooling System

Total Coolant capacity (L)	73
Recommended coolant specification	premix with 50% Glycol

Dimensions and Weight

Net weight (kg)/Dry weight	1200
Length (mm)	1695
Width (mm)	858
Height (mm)	1385

FAQ- ENGINE

Weichai is your all-around engine solution for commercial purposes. It will offer a quick understanding of the brand, product, and industry.

Q. What is a marine propulsion engine?

A marine propulsion engine is the main power source that drives a ship or boat through the water. It converts fuel into mechanical power to rotate the propeller and move the vessel forward.

Q. Are Weichai marine propulsion engines fuel-efficient?

Yes, Weichai propulsion engines are engineered for high thermal efficiency, low fuel consumption, and long sailing hours, helping reduce operational cost for fishing, cargo, and passenger vessels.

Q. Can these engines handle long voyages?

Yes, they are built for continuous and reliable operation during long-distance sailing. Their robust design ensures stability even under heavy load and challenging sea routes.

Q. Do marine propulsion engines support harsh marine environments?

Absolutely. These engines are designed to resist corrosion, humidity, and temperature fluctuations, ensuring safe performance in coastal and deep-sea environments.

Q. What types of vessels can use these engines?

Weichai propulsion engines are widely used in fishing boats, cargo ships, patrol boats, ferries, workboats, and offshore support vessels.

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