Isuzu 6H engine
The Isuzu 6H is a family of inline six-cylinder diesel engines installed in Isuzu medium-duty trucks, and also installed in GM medium-duty trucks as the Duramax LG4. It is mated to the Allison 2500, 3000, and 3500 series transmissions.
Engine specifications
6HK1/Duramax LG4- Displacement:
- Bore and stroke:
- Block: gray iron
- Cylinder head: cast iron
- Fuel cutoff: 2400 rpm
- Aspiration: Turbocharged and intercooled
- Valvetrain: SOHC 24-valve
- Compression: 17.5:1
- Injection: high-pressure common-rail direct injection
- Power/torque:,
- Displacement:
- Bore and stroke:
- Aspiration: Naturally aspirated
- Valvetrain: SOHC 24-valve
- Compression ratio: 18.5:1
- Injection: Reformed Bosch, inline injection pump with automatic timer, and all-speed mechanical governor
- Power/torque:,
- Displacement:
- Bore and stroke:
- Aspiration: naturally aspirated or turbocharged
- Valvetrain: direct injection, SOHC 24-valve
- Compression ratio: 16.9:1
- Injection: direct injection
- Power/torque:,
Engine variants
| Model | Displacement | Output | Notes |
| 6HE1-N | |||
| 6HE1-S | |||
| 6HE1-TCN | |||
| 6HE1-TCS | |||
| 6HH1-N | |||
| 6HH1-C | |||
| 6HH1-S | |||
| 6HL1-N | |||
| 6HL1-S | |||
| 6HK1-TCR | |||
| 6HK1-TCN | |||
| 6HK1-TCC | |||
| 6HK1-TCS | |||
| 6HK1-TCH | |||
| Duramax LG4 7800 | used in GMC medium-duty trucks |