Product Description
CUMMINS 3937214 OEM PISTON COOLING NOZZLE (OIL SQUIRTER/JET) – RAM 5.9L 12V/24V (1994–2002)
The genuine CUMMINS 3937214 piston cooling nozzle is a critical lubrication component used on 1994–2002 5.9L B-Series engines. This OEM oil jet sprays engine oil directly onto the underside of the piston crown, dramatically reducing piston temperatures and increasing durability under heavy load, towing, and performance use. If you are rebuilding or refreshing a 12-valve or 24-valve engine, replacing worn or clogged cooling nozzles is mandatory for long-term reliability.
This Cummins nozzle installs directly into the block oil gallery and ensures proper piston cooling and lubrication at all operating temperatures. Whether you're restoring an engine or building a high-power 5.9L, the 3937214 oil jet ensures correct flow and spray pattern exactly as engineered by Cummins.
Key Features
- Genuine Cummins OEM nozzle – not an aftermarket substitute.
- Correct piston oil spray pattern for 12V and 24V applications.
- Prevents piston overheating under load or high horsepower.
- Critical for engine rebuilds and performance upgrades.
- Direct-fit replacement for factory nozzle 3937214.
Fitment Details
- Engine: Cummins 5.9L B-Series (12-Valve & 24-Valve)
- Model Years: 1994–2002
- Vehicles: Dodge Ram 2500 & 3500 with 5.9L Cummins
- Block Compatibility: 5.9L blocks equipped for piston cooling jets
Note: Always replace all cooling nozzles as a complete set during rebuilds for balanced oil distribution.
Cross-Reference & Companion Cummins Parts
CPP Diesel carries complementary Cummins components commonly replaced during lower-end rebuilds:
- CUMMINS 3920691 MAIN BEARING SET
- CUMMINS 3802376 ROD BEARING SET
- CUMMINS 3947912 PISTON RING SET
- CUMMINS 3931262 OIL PUMP
- VIEW ALL GENUINE CUMMINS PARTS
Installation Notes
- Confirm correct orientation to ensure proper oil spray direction.
- Always torque to Cummins specifications.
- Clean all oil passages thoroughly before installation.
- Replace all nozzles together to ensure balanced lubrication.
Specifications for cummins 3937214
| Attribute | Value |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Part Number | 3937214 |
| Function | Piston cooling oil nozzle (oil squirter / oil jet) |
| Engine Compatibility | 5.9L Cummins 12V & 24V (1994–2002) |
| Vehicle Fitment | 1994–2002 Dodge Ram 2500/3500 w/ 5.9L Cummins |
| UPC | 607611429864 |
| GTIN | 00607611429864 |
| Shipping Weight | 0.05 lb |
| Typical Shipping Method | Standard ground |
| Cross Reference | None listed; verify by ESN for alternate block variants |
| E-Codes | Used in multiple on-road emissions families; verify by ESN |
| Prop 65 Warning | WARNING: This product can expose you to chemicals including engine oil and related residues. For more information visit P65Warnings.ca.gov. |
| Country of Origin | As labeled by Cummins (varies by lot) |
Frequently Asked Questions
DO I NEED TO REPLACE ALL PISTON COOLING NOZZLES DURING A REBUILD?
Yes. Cummins recommends replacing all cooling nozzles at the same time to ensure uniform oil spray and lubrication.
WILL THIS FIT BOTH 12-VALVE AND 24-VALVE 5.9L ENGINES?
Yes. The 3937214 oil jet is used across 1994–2002 12V and 24V 5.9L Cummins engines. Always confirm with your ESN.
WHAT HAPPENS IF A COOLING NOZZLE FAILS OR CLOGS?
Pistons can overheat, scuff, or seize due to insufficient lubrication. Replacing old or damaged nozzles is crucial for engine longevity.
IS THIS A GENUINE CUMMINS PART?
Yes — CPP Diesel supplies only genuine Cummins OEM 3937214 nozzles.
CAN THIS BE USED IN PERFORMANCE OR HIGH-HP BUILDS?
Absolutely. Proper piston cooling is even more important in high-cylinder-pressure engines.
