The Isuzu 4HK1 is a robust and reliable 5.2L inline four-cylinder diesel engine designed for medium-duty commercial trucks, industrial applications, and power generation equipment. Featuring a cast-iron block and head for enhanced durability, this engine incorporates advanced technologies such as a high-pressure common rail fuel injection system, variable geometry turbocharger (VGS) with air-to-air intercooling, and direct injection for optimal fuel efficiency and performance.
Key specifications include:
- Displacement: 5.193 liters (317 cubic inches)
- Configuration: 4-cylinder, 4-stroke, water-cooled, SOHC with 16 valves
- Bore x Stroke: 115 mm x 125 mm
- Compression Ratio: Varies by model (e.g., 16.5:1 in later versions)
- Power Output: Up to 215 hp @ 2,500 rpm (truck applications); 173 hp constant speed or 188 hp variable speed for industrial use
- Torque: Up to 520 lb-ft @ 1,600 rpm (2020+ models); other variants offer 452 lb-ft or more
- Emissions Compliance: Meets U.S. EPA Tier 4 standards without a diesel particulate filter in some configurations, promoting eco-friendly operation
- Dry Weight: Approximately 1,170 lbs (530 kg)
- Dimensions: Length 40.7 in (103 cm), Width 36.6 in (93 cm), Height 40.9 in (104 cm)
Introduced in the mid-2000s, the 4HK1 engine is renowned for its longevity, with a B10 life rating of up to 375,000 miles, making it ideal for demanding environments like Isuzu N-Series trucks (e.g., NPR, NQR) and generators. It supports variable and constant speed operations, ensuring versatility across applications. Maintenance is straightforward, with features like a single overhead camshaft and accessible service points. For best results, adhere to Isuzu’s recommended service intervals and use genuine parts.
This engine exemplifies Isuzu’s commitment to engineering excellence, backed by decades of expertise in diesel technology for global markets. Whether for fleet upgrades or industrial projects, the 4HK1 delivers powerful, efficient, and trustworthy performance.
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