6BT5.9-G80

The compact, lightweight, and cost-effective Type B engine delivers cleaner and quieter performance, with a rated power output of 70 kW. Under strict adherence to maintenance guidelines, it achieves a mean time between failures (MTBF) of 1,500 hours and a mean time between overhauls (TBO) of 6,000 hours or more. Even under extreme duty cycle testing, this model maintains strong performance. Its low noise levels, reduced weight, and high power-to-weight ratio are all attributable to its world-class reliability.

Basic Engine Specifications

• Model: HWCTAA12‑G275
• Speed: 1500 RPM & 1800 RPM
• Issue Date: 2024‑03‑26
• Compression Ratio: 11.5:1
• Bore: 130 mm
• Stroke: 158 mm
• Speed Regulation: ≤3%
• Aspiration: Turbocharged & Air‑to‑Air Intercooled
• Displacement: 12.5 L
• Number of Cylinders: 6

Test Conditions

Engine tested with water pump and oil pump; without air compressor, generator, fan, optional components and drives.

Intake restriction: 3.7 kPa; Exhaust back pressure: 10 kPa.

Rated Power Data

Performance Data at 1500 rpm

Performance Data at 1800 rpm

General Notes

Performance data obtained under GB/T 18297 test conditions: ambient pressure 100 kPa, intake air temperature 25 °C.

Typical Engine Data

• Dry Weight: 780 kg
• Moment of Inertia (rotating parts, without flywheel): 0.45 kg·m²
• Distance from CG to front face of cylinder block: 610 mm
• Distance from CG to crankshaft centerline (above crankshaft): 180 mm
• Firing Order: 1‑5‑3‑6‑2‑4

Engine Mounting

• Maximum allowable static bending moment (rear face): 1580 N·m

Exhaust System

• Maximum exhaust back pressure: 10 kPa

Charge Air Cooling System

• Max allowed temperature difference (intake manifold vs. ambient): 25 °C
• Max allowed pressure drop (before/after intercooler): 13 kPa
• Max intake manifold temperature (at 25 °C ambient): 50 °C
• Max intake manifold temperature: 58 °C

Air Intake System

• Max allowable intake restriction (heavy‑duty air cleaner):
  • Clean element: 3.7 kPa
  • Dirty element: 6 kPa
• Minimum dirt holding capacity (heavy‑duty air cleaner): 53 g/litre/sec
• Max temperature rise from ambient to turbo inlet: 17 °C
• Recommended minimum intake pipe inner diameter: 85 mm

Lubrication System

• Normal oil pressure range:
  • Low idle: 207 kPa
  • Rated speed: 345 kPa
• Oil capacity (offset oil pan): Max 16.5 L – Min 14.0 L
• Max oil sump temperature: 121 °C
• Minimum system capacity (sump + filter): 28.5 L
• Offset pan inclination limits:
• Front up: 4°
• Front down: 0°
• Side to side: 0°

Cooling System

• Coolant capacity (engine only): 15.0 L
• Max external cooling circuit resistance:
  • 1800 rpm: 35 kPa
  • 1500 rpm: 28 kPa
• Max static coolant height above crankshaft centerline: 1.4 m
• Thermostat opening temp (range): 82–95 °C
• Minimum pressure cap pressure: 69 kPa
• Max coolant temp:
• Standby power: 104 °C
• Prime power: 100 °C

Electrical System

Emission Data (GB 20891‑2007)

At 1500 rpm rated speed

• NOₓ: 9.2 g/kW·h
• HC: 1.3 g/kW·h
• CO: 5.0 g/kW·h
• Particulate: 0.70 g/kW·h

At 1800 rpm rated speed

• NOₓ: 9.2 g/kW·h
• HC: 1.3 g/kW·h
• CO: 5.0 g/kW·h
• Particulate: 0.54 g/kW·h

Thermal & Flow Performance