3801773 Genuine 14.0:1 Piston Kit for Cummins NTA855 Engines

Product Overview:

The Cummins 3801773 is the mainstream universal piston for NT855/NH855 series diesel engines, engineered to Cummins original factory specifications. It is purpose-built to address the balance of reliability, cost, and fuel economy for the most common operating conditions: medium loads and continuous medium-to-high speed operation.

As one of the best-selling and most widely applied piston models in the NT855 platform's lifecycle, it follows the "adequate and durable" design philosophy. It precisely targets over 70% of conventional application scenarios for NT855 engines, delivering proven performance without unnecessary over-engineering, making it the most cost-effective choice for standard engine rebuilds and routine maintenance.

Key Features :
✅ 14.0:1 Golden Compression Ratio – Balances thermal load and fuel economy: runs 80-100°C cooler than 14.5:1 pistons, extends overhaul intervals, with only 1-2% negligible fuel consumption difference.
✅ Targeted Single-Ni Wear Insert – Reinforces only the highest-wear top ring groove, tripling service life while keeping costs 30% lower than dual-nickel pistons.
✅ Optimized 4-Ring Design (3 Compression + 1 Oil) – Improves cylinder sealing, reduces blow-by, and controls oil consumption to 0.1-0.2g/kW·h, meeting industry-leading standards.
✅ Split-Style Flexible Kit – Piston pin sold separately, allowing reuse of good-condition pins to significantly lower repair costs.
✅ 70% NT855 Application Coverage – Perfectly matched for 1500rpm/1800rpm generator sets and continuous-duty industrial pumps/compressors.

Core Application Scenarios :