Sinotruk HOWO 371 Engine Specifications: Comprehensive Technical Analysis
Introduction to the HOWO 371 Engine
The Sinotruk HOWO 371 engine specifications—factory code WD615.47—describe a 9.726L inline-six turbocharged diesel unit that has powered heavy-duty HOWO trucks across Africa, Southeast Asia, and the Middle East for well over a decade. Its reputation rests on a simple formula: enough torque to pull 40–60 tonnes, fuel consumption that won’t bankrupt a fleet operator, and a mechanical layout that local workshops can actually service without dealer-only diagnostic tools.
This page breaks down the full Sinotruk HOWO 371 engine specifications, including bore and stroke, power and torque curves, fuel system pressure, emission compliance, and maintenance intervals. If you are comparing the HOWO 371 against the Weichai WP10.375 or Cummins ISM11, the comparison tables below will give you the numbers side by side.
Sinotruk HOWO 371 Engine Specifications: Technical Data
Sinotruk HOWO 371 Engine Specifications: Core Parameters
According to the Sinotruk HOWO 371 engine specifications, the WD615.47 uses a 126mm bore and 130mm stroke, giving a total displacement of 9.726 liters. The block is cast iron with seven main bearings and wet cylinder liners—a design choice that lets rebuilders replace liners and pistons without machining the block. Aspiration is handled by a turbocharger with air-to-air intercooling, which keeps intake temperatures low enough to maintain power output in ambient temperatures above 40°C.
- Engine Model: WD615.47 (Sinotruk HOWO 371)
- Configuration: Inline 6-cylinder, 4-stroke diesel
- Displacement: 9.726 L (9,726 cc)
- Bore × Stroke: 126 mm × 130 mm
- Compression Ratio: 17.5:1
- Valvetrain: OHV, 2 valves per cylinder
- Cooling: Water-cooled, gear-driven water pump
- Emission Standard: Euro II (China National II)
Sinotruk HOWO 371 Engine Specifications: Performance & Fuel Consumption
The Sinotruk HOWO 371 engine specifications list peak power at 371hp (276kW) at 2200rpm. The torque curve is where the WD615.47 earns its keep: 1590Nm arrives at 1100rpm and holds flat through 1600rpm. That low-rpm, flat torque profile is what makes the 371 feel strong when pulling a loaded trailer from a standstill on an incline. Specific fuel consumption is rated at 195 g/kWh at rated power; real-world highway consumption typically lands between 32–38 L/100km depending on gross vehicle weight and terrain.
- Maximum Power: 371 hp (276 kW) @ 2200 rpm
- Peak Torque: 1590 Nm @ 1100–1600 rpm
- Torque at 1000 rpm: approx. 1350 Nm
- Specific Fuel Consumption: 195 g/kWh @ rated power
- Idle Speed: 600–650 rpm
- Governed Speed: 2400 rpm
Sinotruk HOWO 371 Engine Specifications: WD615 Family Cross-Reference
The Sinotruk HOWO 371 engine specifications cover the entire WD615 platform, which spawned multiple power ratings for different truck applications. If you are trying to identify which engine is in a particular HOWO truck, or deciding which variant fits your operation, the table below maps the main WD615 variants against their power, torque, and emission ratings.
| Engine Model | Power (hp/kW) | Peak Torque (Nm) | Emission | Typical Application |
|---|---|---|---|---|
| WD615.47 | 371 / 276 @ 2200 rpm | 1590 @ 1100–1600 rpm | Euro II | HOWO 371 tractor, dump truck |
| WD615.69 | 336 / 247 @ 2200 rpm | 1350 @ 1300–1600 rpm | Euro II | HOWO 336 cargo, mixer |
| WD615.34 | 290 / 213 @ 2200 rpm | 1160 @ 1300–1600 rpm | Euro II | HOWO 290 light dump, cargo |
| WD615.87 | 290 / 213 @ 2200 rpm | 1100 @ 1300–1600 rpm | Euro II | HOWO 290 tractor, cargo |
| WD615.95 | 310 / 228 @ 2200 rpm | 1250 @ 1300–1600 rpm | Euro II | HOWO 310 cargo, dump |
Sinotruk HOWO 371 Engine Specifications vs. Weichai WP10.375 vs. Cummins ISM11
Fleet buyers comparing the Sinotruk HOWO 371 engine specifications often cross-shop against the Weichai WP10.375 and Cummins ISM11. The table below puts the key numbers side by side. Note that the Cummins ISM11 is an 11-liter engine, so it sits in a different displacement class—but it is frequently quoted as an alternative in the same 370–400hp bracket.
| Parameter | Sinotruk WD615.47 | Weichai WP10.375 | Cummins ISM11 |
|---|---|---|---|
| Displacement | 9.726 L | 9.726 L | 10.8 L |
| Max Power | 371 hp @ 2200 rpm | 375 hp @ 2200 rpm | 385 hp @ 2100 rpm |
| Peak Torque | 1590 Nm @ 1100–1600 rpm | 1600 Nm @ 1200–1600 rpm | 1695 Nm @ 1200–1400 rpm |
| Emission | Euro II | Euro II / Euro III | Euro II / Euro III |
| Fuel System | Mechanical inline pump (P-type) | Mechanical or common rail | Electronic unit injection |
| Dry Weight | approx. 850 kg | approx. 860 kg | approx. 940 kg |
Sinotruk HOWO 371 Engine Specifications: Fuel System & Emission Control
The Sinotruk HOWO 371 engine specifications confirm a mechanical P-type inline injection pump rather than a common rail system. Injection pressure peaks around 1800 bar. This is a deliberate choice for markets where fuel quality varies and electronic diagnostic support is limited—a mechanical pump can be rebuilt by any competent diesel shop, and it tolerates contaminated fuel better than a high-pressure common rail system.
Fuel Injection Specifications
Injection timing is set at 18° BTDC (static). The P-type pump delivers fuel through 7-hole injectors with a nozzle opening pressure of 220–230 bar. There is no electronic control unit on the fuel side, which means no sensors to fail and no software to flash. Fuel filtration is a two-stage system: a pre-filter/water separator followed by a 5-micron secondary filter.
Emission Compliance
The WD615.47 meets Euro II (China National II) standards through mechanical means alone—no EGR, no SCR, no DPF. This keeps the exhaust system simple and maintenance-free, but it also means the engine cannot be registered in markets that require Euro III or higher. For Euro III/IV markets, Sinotruk offers the WD615.47 with an aftertreatment package or directs buyers to the MC07 series.
Sinotruk HOWO 371 Engine Specifications: Design and Construction Details
According to the Sinotruk HOWO 371 engine specifications, the cylinder block is cast iron with a skirted design that adds rigidity to the bottom end. Seven main bearings support the crankshaft, which is forged steel and nitrided for surface hardness. Connecting rods are forged steel with a 48mm journal diameter. Pistons are aluminum alloy with a re-entrant bowl design and a Ni-resist insert for the top ring groove—this insert is what prevents the ring groove from pounding out when the engine runs at high load for extended periods.
The gear train at the front of the engine drives the oil pump, water pump, and injection pump. There is no timing belt or chain—just steel gears. This is a reliability decision: gears do not stretch, skip, or snap. The cooling system uses a centrifugal water pump with a 120 L/min flow rate at rated speed, paired with a 10-row radiator in most HOWO installations. Oil capacity is 28 liters including the filter, and the oil cooler is a plate-type unit mounted on the block side.
Sinotruk HOWO 371 Engine Specifications: Application Analysis
The Sinotruk HOWO 371 engine specifications show that the WD615.47 is the standard engine for the HOWO 371 tractor truck and also appears in HOWO 371 dump trucks and concrete mixer chassis. Its torque curve—flat from 1100 to 1600 rpm—suits two very different jobs: highway hauling at 80–90 km/h with a 40-tonne payload, and site work where the truck has to crawl out of a loaded trench without stalling. The mechanical fuel system is an advantage in markets where diesel sulfur content is unpredictable; the P-type pump and 7-hole injectors are far more tolerant of dirty fuel than common rail hardware.
Sinotruk offers the WD615.47 in several configurations for different regions. Tropical-spec engines get a larger radiator and a higher-capacity cooling fan. Cold-climate versions add an intake air heater and a block heater. Power take-off (PTO) provisions are standard on the timing gear cover, which lets the engine drive hydraulic pumps for dump trailers or mixer drums. If you are specifying a new HOWO 371, confirm the engine variant code with your dealer—the base engine is the same, but the cooling and accessory packages differ by market.
Sinotruk HOWO 371 Engine Specifications: Maintenance Specifications
Per the Sinotruk HOWO 371 engine specifications, the oil change interval is 15,000 km or 300 hours, whichever comes first, with a 28-liter fill of API CF-4 or higher grade oil. The oil filter is a spin-on cartridge; the fuel filter is a two-stage setup with a 10-micron primary and a 5-micron secondary. Valve clearance is set cold at 0.30mm intake and 0.40mm exhaust, checked every 30,000 km. The injection pump requires no routine adjustment, but injector nozzle opening pressure should be tested every 60,000 km.
Common failure points to watch: the water pump seal tends to weep after 4,000–5,000 hours; the exhaust manifold gasket can blow out if the manifold studs are not retorqued after the first 1,000 hours; and the turbocharger oil feed line can coke up if oil changes are stretched. None of these are catastrophic, but they are the items a preventive maintenance schedule should cover. If you need replacement components for any of these systems, genuine Sinotruk HOWO 371 engine parts are available. The engine has no electronic control unit, so there are no fault codes to read—troubleshooting is done with a fuel pressure gauge and a compression tester.
Sinotruk HOWO 371 Engine Specifications: Comparative Analysis and Market Position
Efficiency Metrics
195 g/kWh specific fuel consumption at rated power. Real-world highway consumption of 32–38 L/100km at 40–50 tonnes GVW. The mechanical pump’s fixed timing means efficiency is not optimized per-cylinder like a common rail, but it also means no electronic degradation over time.
Durability Indicators
Cast iron block, forged crankshaft, wet liners. Major overhaul interval is typically 8,000–10,000 hours in line-haul service. The gear-driven accessory train eliminates timing belt/chain failure modes. Parts availability is strong in Africa and Southeast Asia.
Operational Flexibility
Euro II mechanical engine works in markets with poor fuel quality and limited dealer support. PTO provisions for hydraulic equipment. Available in tropical and cold-climate configurations. Not suitable for Euro III+ regulated markets without aftertreatment.
Technical Evaluation Summary
The Sinotruk HOWO 371 engine specifications describe a powerplant that is not sophisticated by 2026 standards. It has no common rail, no electronic control unit, no EGR, and no SCR. That is precisely the point. In markets where the HOWO 371 sells—Zambia, Tanzania, Nigeria, Indonesia, and similar—the ability to run on high-sulfur diesel and be repaired by a mechanic with hand tools matters more than meeting Euro VI. The 1590Nm torque curve is strong for its displacement class, and the 9.726L displacement keeps fuel consumption reasonable for a 40-tonne tractor.
If you need a Euro III or Euro IV engine for regulatory reasons, this is not the right powerplant—look at the Sinotruk MC07 or a common rail WD615 variant. But if you are running trucks in a market where mechanical simplicity and parts availability are the top priorities, the WD615.47 remains one of the most practical 370hp diesel engines available.
Sinotruk HOWO 371 Engine Specifications: Frequently Asked Questions
What is the oil capacity according to the Sinotruk HOWO 371 engine specifications?
The WD615.47 holds 28 liters of engine oil including the filter. Use API CF-4 or higher grade, 15W-40 for most climates. The oil change interval is 15,000 km or 300 hours, whichever comes first.
What torque does the Sinotruk HOWO 371 engine specifications list?
Peak torque is 1590 Nm, delivered between 1100 and 1600 rpm. At 1000 rpm the engine still produces approximately 1350 Nm, which is why it pulls well from low revs.
Are the Sinotruk HOWO 371 engine specifications Euro III compliant?
No. The standard WD615.47 is Euro II (China National II). It uses a mechanical injection pump with no EGR or SCR. For Euro III or Euro IV markets, Sinotruk offers the MC07 series or a common rail WD615 variant with aftertreatment.
What is the fuel consumption in the Sinotruk HOWO 371 engine specifications?
Specific fuel consumption is rated at 195 g/kWh at rated power. In real-world highway operation at 40–50 tonnes gross vehicle weight, expect 32–38 L/100km depending on terrain, load, and driving style.
What is the difference between WD615.47 and WD615.69 in the Sinotruk HOWO 371 engine specifications?
The WD615.47 is the 371hp / 1590Nm version. The WD615.69 is rated at 336hp / 1350Nm. Both share the same 9.726L displacement and cast iron block, but the .47 has a different injection pump calibration and turbocharger spec to achieve the higher output.
Can the Sinotruk HOWO 371 engine specifications run on high-sulfur diesel?
Yes. The mechanical P-type injection pump and 7-hole injectors tolerate high-sulfur fuel far better than common rail systems. This is one of the main reasons the WD615.47 remains popular in African and Southeast Asian markets where fuel quality varies.
What valve clearance do the Sinotruk HOWO 371 engine specifications require?
Set valve clearance cold: 0.30mm on the intake valves and 0.40mm on the exhaust valves. Check and adjust every 30,000 km. The locknuts are 24mm and the adjuster screws are 10mm.
