Cummins 3937214 Piston Cooling Nozzle (Oil Squirter) – 5.9L Cummins

Genuine Cummins 3937214 piston cooling nozzle (also called an oil squirter or piston cooling jet) for 5.9L Cummins B-Series engines.

This critical component mounts in the engine block and sprays pressurized oil onto the underside of the piston crown. Proper oil spray helps control piston temperatures, reduces the risk of scuffing or seizure, and supports long-term durability—especially under towing, heavy loads, or elevated power levels.

Key Details

• OEM Part Number: 3937214
• Replaces / Cross References: 3919002, 3930139
• Sold individually (order quantity of 6 for a complete 6-cylinder engine)

Common Applications

• 1994–1998 Dodge Ram 2500/3500 5.9L 12-valve Cummins
• 1998.5–2002 Dodge Ram 2500/3500 5.9L 24-valve Cummins
• Cummins B-Series, ISB, and QSB 5.9L engines (various industrial and commercial applications)

Always verify fitment by engine serial number (ESN) when possible, as some later or industrial variants may differ.

Why Replace It?

Piston cooling nozzles can become restricted, damaged, or clogged over time. Restricted oil flow to the pistons is a known contributor to elevated piston temperatures and potential engine damage. These nozzles are commonly replaced as a set during any bottom-end rebuild or major engine work.

Features:

• Direct-fit OEM design
• Maintains correct spray pattern and oil volume
• Essential for proper piston cooling and lubrication
• High-quality Cummins construction for reliable service life

Recommended for engine rebuilds, performance builds, or preventive maintenance on high-mileage 5.9L Cummins engines.