High-Quality Howo 420 Engine Supplier

Product Description of Howo 420 Engine

The HOWO 420 Engine is a high-power heavy-duty turbocharged diesel engine launched by SINOTRUK. Featuring 420HP (309kW) rated power and ultra-strong torque output, it delivers explosive and stable power performance, perfectly suited for heavy haulage, long-distance logistics and harsh construction working conditions. Adopting upgraded reinforced structure and advanced turbo intercooler fuel injection system, it achieves outstanding power efficiency, excellent durability and lower comprehensive fuel consumption. With stable operation quality, low failure rate and easy daily maintenance, it is highly compatible with full-series HOWO heavy trucks and engineering machinery, serving as a premium high-cost-performance power option for heavy-duty commercial equipment.

Engines and Spare Parts of Howo 420 Engine

The HOWO 420 (D12.42) engine is equipped with a Bosch electronic high-pressure common rail fuel system with a maximum rail pressure of 1600 bar. It adopts two-stage fuel filtration for water and impurity removal, precisely controlled multi-stage injection including pre-injection, main injection and post-injection, and a complete pressure relief and fuel return circuit. Managed by ECU real-time monitoring, the system delivers sufficient power, full fuel combustion, lower noise and emissions, ensuring stable and reliable performance for heavy-duty and long-haul driving.

Engines

Spare Parts

Cylinder Head Cover

Cylinder Liner

Cylinder Lining

Fuel Injector

Starter

Water Pump

All WD615 engine units undergo professional bench testing, durability inspection and performance calibration before delivery. The whole series complies with Euro II emission standards, ensuring stable output, low fuel consumption and long service life for heavy truck operation.

Howo 420 Engine Specification Table

Parameter Item	Specific Data
Official Engine Model	D12.42-20 / D12.42-30
Rated Power	420PS (309kW) / 2000rpm
Max Torque	1820Nm / 1100-1400rpm
Engine Structure	Inline 6-cylinder, 4-stroke, water cooling, turbocharged intercooled
Displacement	11.596L
Bore × Stroke	126mm × 155mm
Compression Ratio	17:1
Valve Quantity	4 valves per cylinder
Fuel Supply System	Mechanical high-pressure oil pump / Common rail injection (Euro III version)
Emission Standard	Euro II / Euro III optional
Net Weight	850-1100kg
Engine Oil Capacity	23L
Applicable Vehicle Types	Howo tractor truck, dump truck, mixer truck, heavy haulage truck

Core Advantages of Howo 420 Engine

1.Powerful Low-speed Torque for Heavy-duty Transportation

Our genuine Howo 420 Engine outputs 1820Nm max torque at low rotation speed. For fully loaded mining dump trucks and long-distance transport tractors, strong low-speed power avoids frequent gear shifting, reduces engine wear and improves driving stability on mountainous and muddy roads.

2. Excellent Fuel Economy & Stable Operation

Optimized combustion chamber design and turbo intercooling system improve fuel full combustion. Compared with 371hp Howo engines of the same series, HOWO 420 Engine controls fuel consumption effectively under full load, cutting long-term operation costs for fleet companies. The reinforced cylinder block and crankshaft reduce vibration during long-hour continuous operation.

3.High Durability & Low Maintenance Cost

All key components of our Howo 420 Engine assembly adopt Sinotruk original castings and wear-resistant accessories. The overall structure is easy to disassemble and inspect. Global stock of matching Howo 420 engine spare parts can quickly replace worn parts, shorten vehicle downtime and lower repair expenses for overseas clients.

4. Multi-scene Compatibility & Global Emission Compliance

This Howo 420 diesel engine can be perfectly matched with all classic Howo heavy truck chassis. Euro II and Euro III versions support export to Southeast Asia, Africa, Middle East and Central Asian markets without complicated modification work before customs clearance.

Powerful Low-speed Torque

Eco & Stable Running

Durable & Low Upkeep

Globally Emission-Compliant

Howo 420 Engine Powered Transport and Support

1. Fuel System After-sales Maintenance for Transport Vehicles

2. Full-process after-sales technical support and fault troubleshooting

3. Warranty and repair service for heavy-duty truck fuel systems

4. Fuel system fault detection and parts replacement

5. Regular inspection and maintenance service for transport vehicles

6. Rapid after-sales fault response and on-site maintenance

7. Original factory warranty service for fuel system accessories

8. After-sales problem tracking and customer return visit

FAQ of Howo 420 Engine

Q1: What is the model code of standard Howo 420 Engine?
A1: The mainstream original model is D12.42-20 (Euro II) and D12.42-30 (Euro III), both belong to Howo 420hp diesel engine series.
Q2: Can I buy separate Howo 420 engine spare parts without purchasing the whole engine assembly?
A2: Yes, we support separate retail of all matching spare parts for Howo 420 Engine, you only need to provide engine serial number or old part photos for accurate matching.
Q3: What is the warranty period of your supplied Howo 420 complete engine?
A3: Our genuine Howo 420 engine assembly has a 12-month factory warranty from the date of shipment, excluding damage caused by improper operation and lack of regular maintenance.
Q4: Can the Howo 420 Engine be refitted to old Howo 371 truck chassis?
A4: Partial modification of pipeline and support foot pads is required, our technical team can provide professional refitting parameter guidance for free.
Q5: What documents can you provide for customs clearance when exporting Howo 420 engine?
A5: We can offer commercial invoice, packing list, factory test certificate, Sinotruk original supply certificate, fumigation certificate for wooden package and other full export documents.