Product Description
The genuine Cummins 4937308 piston cooling nozzle (oil squirter) delivers factory-spec performance to your 2003–2018 Ram 5.9L/6.7L ISB engines. This nozzle is engineered to spray a precise jet of oil onto the underside of each piston — providing critical cooling under load, helping prevent piston overheating, scuffing, and thermal failure. It’s a direct-fit OEM replacement that restores the original spray pattern and cooling efficiency, critical for heavy towing, high-RPM performance, or engine rebuilds. Use 6 nozzles per engine (one per cylinder) for complete piston-side cooling as the factory intended.
Fitment & Cross-Reference
- ✔ Fits: 2003–2007 Ram 5.9L ISB (24V CR) and 2007.5–2018 Ram 6.7L ISB (verify by ESN/CPL).
- ✔ Also used in certain ISB / QSB heavy-duty / industrial applications where 4937308 specification applies.
- ✔ Cross-Reference / Related OEM numbers: 4890024, 3968877.
- ⚠ Sold individually — plan on ordering six (6) for a full engine set.
- ⚠ This nozzle uses banjo bolt 3964817 (sold separately) — one bolt per nozzle.
Description
The Cummins 4937308 nozzle is machined to exact OEM tolerances, ensuring proper fit without modification. Under heavy load or sustained RPM, pistons generate significant heat — the oil squirter delivers a fine, targeted spray onto the piston underside, dissipating heat and maintaining piston crown integrity. Compared with aftermarket "universal" nozzles, the genuine Cummins unit ensures spray angle, flow rate, and sealing performance match factory spec, keeping your engine running reliably and efficiently. This part is ideal for rebuilds, preventative maintenance, or restoring cooling system during performance upgrades.
FAQ
WILL THIS FIT MY 2003–2018 5.9L/6.7L CUMMINS RAM?
Yes — this nozzle is listed for 2003–2007 5.9L ISB and 2007.5–2018 6.7L ISB applications (verify by VIN/ESN).
HOW MANY NOZZLES DO I NEED?
Six per engine — sold individually. Order quantity 6 for a complete set.
DOES THIS INCLUDE THE BANJO BOLT?
No — the banjo bolt (3964817) is sold separately and is required for installation.
IS THIS A GENUINE CUMMINS PART?
Yes — this is the OEM Cummins 4937308 nozzle, not an aftermarket copy.
WHAT ARE THE CROSS-REFERENCE NUMBERS?
Common identifiers include 4890024 and 3968877 (for some ISB/QSB applications).
Specifications for cummins 4937308
| Attribute | Value |
|---|---|
| Manufacturer Part # | 4937308 |
| Part Type | Piston Cooling Nozzle / Oil Squirter |
| Fitment | 2003–2018 Ram 5.9L & 6.7L ISB, applicable ISB/QSB engines (verify ESN) |
| Quantity Required | 6 per engine (sold individually) |
| Cross Reference | 4890024, 3968877 |
| Associated Hardware | Banjo Bolt 3964817 (sold separately) |
| Shipping Weight (per piece) | ≈ 0.08 lb (per Cummins spec) |
| GTIN / UPC | |
| E-Codes / Prop 65 | None applicable / Not regulated |
