Cummins Piston Cooling Valve 4099041For Diesel Engine KTA50 QSK50 QSK38

The 4099041 Piston Cooling Valve is an OEM-exclusive component engineered for Cummins' largest engines:

- KTA50 (50L, 2,200–3,500 hp)

- QSK50 (50L, 3,500–4,000 hp)

- QSK38 (38L, 1,900–2,800 hp)

This critical thermal regulator maintains 120–140°C oil temperatures under 2,500 hp loads, preventing piston crown deformation and ring land failures costing over $100,000 per incident.

Constructed with super duplex stainless steel (UNS S32750) and plasma-sprayed ceramic coatings, it exceeds industry durability benchmarks:

- 1,000-hour salt spray resistance (ASTM B117)

- 10 million pressure cycles (SAE J1997)

- 5x longer lifespan than aftermarket alternatives

Part Number: 4099041
Original Manufacturer Standard English Name: VALVE, PISTON COOLING
Chinese Name: Piston Cooling Valve / Piston Oil Cooling Nozzle Assembly
Interchange Part Number: 4916821 (Universal Replacement Number for Same Part)
Material: High-strength alloy forged steel, built-in unidirectional throttling valve core, resistant to high-temperature and high-pressure engine oil, wear-resistant and corrosion-resistant

KTA38, QSK38, KTA50, QSK50 Full Range of Heavy-Duty Units

Applicable Equipment: High-power diesel generator sets, heavy mining machinery, marine main engines, oilfield power units

Installation Location: Main oil passages of the engine body and the crankcase cylinder wall positions, with one unit installed per cylinder.

Operating Principle: When the oil pressure reaches the set value, the check valve opens, and high-pressure oil is directionally injected into the piston cavity, continuously cooling the top of the piston and the ring grooves, preventing piston overheating, scuffing, and crown damage; it automatically closes under low oil pressure to reduce oil consumption.

Hazards of Failure: Nozzle blockage or sticking of the valve core can cause piston overheating, power loss, increased oil consumption, and piston cracking; failure of the check valve can result in low idle oil pressure.