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.

Maximum continuous operating altitude: 2200 m.

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

Item	Unit	1800 rpm Standby	1500 rpm Standby	1800 rpm Rated	1500 rpm Rated
Engine Speed	rpm	1800	1500	1800	1500
Low Idle Speed	rpm	750–850	750–850	750–850	750–850
Output Power	kW	294	275	260	240
Piston Speed	m/s	8.9	7.9	8.9	7.9
Friction Loss	kW	32	26	30	24
Coolant Flow	L/sec	4.8	4.0	4.8	4.0
Intake Flow	L/sec	320	245	310	235
Exhaust Flow	L/sec	880	690	790	610
Exhaust Temperature	°C	580	550	550	510
Air/Fuel Ratio	air:fuel	12:1	12:1	12:1	12:1
Ambient Heat Loss (dry manifold)	kW	38	31	34	28
Coolant Heat Loss (dry manifold)	kW	115	105	112	102
Exhaust Heat Loss	kW	190	175	160	145