Product Description
CUMMINS 3964817 OEM PISTON OIL SQUIRTER BANJO BOLT – ISB 5.9L/6.7L (2003–2018)
The genuine CUMMINS 3964817 piston oil squirter banjo bolt secures the piston cooling nozzle (oil squirter) to the main oil gallery on ISB 5.9L and 6.7L Cummins engines. These bolts are a critical component in maintaining optimal piston cooling, lubrication, and engine longevity. Worn, stripped, or damaged bolts can lead to oil pressure loss, misdirection of the cooling jet, and potential piston overheating.
This is an OEM Cummins fastener, built with the correct hardness, thread engagement, and shoulder design to ensure proper sealing and nozzle alignment. If you are rebuilding a 5.9 or 6.7 engine, replacing damaged oil jets, or repairing the lower end, the 3964817 banjo bolt is required for correct OE reassembly.
Key Features
- Genuine Cummins OEM fastener for piston cooling nozzles.
- Prevents oil pressure loss by maintaining a proper seal on the oil gallery.
- Correct hardness and dimensions—avoids breakage common with aftermarket bolts.
- Critical hardware for lower-end rebuilds and engine overhauls.
- Compatible with ISB 5.9L (2003–2007) and 6.7L (2007.5–2018) platforms.
Fitment Details
- Engine: Cummins ISB 5.9L (Common Rail) & Cummins ISB 6.7L
- Years: 2003–2018
- Function: Secures piston cooling nozzle (oil squirter) to engine block oil gallery
- Position: Internal lower crankcase, one per piston cooling jet
Note: Always inspect oil jets for clogging or directional misalignment during rebuilds.
Cross-Reference & Companion Cummins Parts
CPP Diesel stocks the full Cummins piston cooling system lineup to complete your rebuild:
- CUMMINS 3957097 OEM PISTON COOLING NOZZLE (JET) – correct cooling nozzle used with bolt 3964817.
- CUMMINS 3978559 PISTON COOLING NOZZLE – 6.7L – common 6.7L oil squirter.
- VIEW ALL GENUINE CUMMINS PARTS – full Cummins OEM catalog.
Associated Cummins numbers: 3964817, 3957097 (nozzle), 3978559 (6.7L nozzle). Always verify by ESN before ordering.
Installation Notes
- Torque bolts according to Cummins service manual specifications.
- Always clean the nozzle, bolt, and oil gallery before installation.
- Replace any nozzle that shows signs of clogging, burning, or deformation.
- Use only OEM hardware—aftermarket bolts often crack or distort under load.
Specifications for cummins 3964817
| Attribute | Value |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Cummins Part Number | 3964817 |
| Function | Piston oil squirter (piston cooling nozzle) banjo bolt |
| Engine Compatibility | ISB 5.9L (2003–2007) & ISB 6.7L (2007.5–2018) |
| Vehicle Fitment | Ram 2500/3500 5.9L & 6.7L Cummins (2003–2018) – verify by ESN |
| UPC / Barcode | Not published by Cummins |
| GTIN | Not published by Cummins |
| Shipping Weight | Approx. 0.02 lb |
| Shipping Method | Standard small-parts ground shipping |
| E-Codes | Used in certified ISB families; confirm by ESN |
| Prop 65 Warning | WARNING: May expose you to chemicals from engine oil residues known to cause cancer or reproductive harm. See www.P65Warnings.ca.gov. |
| Country of Origin | As labeled by Cummins (varies by batch) |
Frequently Asked Questions
IS THIS THE CORRECT BOLT FOR MY 5.9L OR 6.7L CUMMINS?
Yes. CUMMINS 3964817 is the OE banjo bolt used on piston cooling nozzles for 2003–2018 ISB engines. Always confirm using your engine serial number.
HOW MANY OF THESE BOLTS DOES MY ENGINE USE?
One bolt is used per piston cooling jet. Most ISB engines use six bolts, one for each cylinder’s nozzle.
SHOULD I REPLACE THESE DURING A REBUILD?
Yes. These bolts often fatigue or lose clamping force over time. Replacing them ensures proper oil pressure and jet alignment.
WHAT NOZZLE DOES THIS BOLT WORK WITH?
This bolt works with OEM Cummins cooling jets such as 3957097 (5.9/6.7 compatible) and 3978559 (6.7-specific).
IS THIS A GENUINE CUMMINS PART?
Yes. CPP Diesel only supplies authentic OEM Cummins hardware for critical internal components.
