Cummins Piston Cooling Nozzles

Product Overview

Cummins piston cooling nozzles act as invisible guardians of the engine lubrication and cooling system, custom-designed for NT855, M11, K19, K38, K50 and other series engines.During high-load engine operation, the temperature of piston crowns can exceed 300°C. With precise positioning, cooling nozzles inject high-pressure engine oil directionally to the piston underside or internal piston cooling galleries to forcibly dissipate heat. This prevents piston thermal deformation, cylinder scuffing and even crown ablation.As mandatory wearable parts for engine overhaul, their injection angle, opening pressure and high-temperature resistance directly determine engine service life and operational stability.

NT855 Series:

Classic Durable Cavity Spray Type

The NT855 engine is a long-standing reliable workhorse for construction machinery. Its piston cooling system relies on cooling nozzles to spray lubricating oil into the inner cavity of pistons.OEM original nozzles adopt high-strength steel tube welding technology, resisting long-term engine vibration without weld cracking or tube bending. Equipped with a dedicated one-way valve structure, the nozzle only opens for oil injection when lube oil pressure hits the calibrated threshold. This avoids weak oil spray at the initial engine startup stage with insufficient oil pressure, and guarantees stable cooling efficiency under all working conditions.

K Series (K19/K38/K50): Dual-Hole Direct Injection for High-Power V-Type Power Units 

High-horsepower K-series engines (KTA19, KTA38, KTA50) face the most stringent piston cooling demands. Their pistons are integrated with dedicated internal cooling galleries.K-series cooling nozzles adopt a dual-hole direct injection & precise alignment structure, which must inject lubricating oil accurately into the two oil guide holes inside the piston. Even a tiny angular deviation will block oil access to the piston cavity, triggering instantaneous crown ablation.As a result, K-series nozzles are manufactured with ultra-tight dimensional tolerances, and structural stability is guaranteed to avoid deformation under extreme high oil temperature conditions.

Why Cooling Nozzles Must Be Replaced — Stop This Hidden Engine Hazard

Cooling nozzles are installed inside the cylinder block and cannot be inspected under normal service conditions. Used nozzles are highly susceptible to clogging by oil sludge, carbon deposits and metallic debris. Once blocked, the piston loses forced cooling. Its temperature can surpass the melting point of aluminum alloy within minutes, resulting in piston melting or cylinder liner scuffing, which will render the entire engine irreparable.