Product Description
Interstate-McBee M-3937214 Piston Cooling Nozzle – 1994–2002 5.9L Cummins (Aftermarket Replacement)
High-quality piston cooling nozzle (oil squirter) for the 5.9L Cummins B-Series. Direct aftermarket replacement for the OEM nozzle that sprays oil to the underside of the piston crown for cooling and lubrication. Sold individually.
- Direct fit: Replaces factory nozzle in the engine block gallery.
- OE-equivalent performance: Maintains correct spray pattern to help manage piston temperatures.
- Durable construction: Built for long service life in stock or lightly modified engines.
- Cost-effective: Interstate-McBee quality at a fraction of OEM-boxed pricing.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3937214 |
| OEM Cross-Reference | Cummins 3937214 |
| Function | Piston cooling (oil squirter) |
| Sold As | Each (1 nozzle) |
| Qty Required | 6 per engine (one per cylinder) |
| Position | Pressurized oil gallery → piston underside |
What’s Included
- (1) Piston cooling nozzle, P/N M-3937214
Vehicle Fitment
Always verify by engine serial number (ESN) when possible.
- Dodge Ram 2500/3500 5.9L Cummins B-Series
- 12-Valve: 1994–1998
- 24-Valve: 1998.5–2002
- Other 5.9L B-Series applications where Cummins 3937214 is specified (confirm by ESN).
Recommended/Related Parts
- Oil gallery sealing washers / fasteners (replace if worn)
- Engine oil & filter (for post-service oil change)
- Piston/rod clearance check tools if using aftermarket rotating assemblies
Install Notes
- Service one cylinder at a time; keep components clean to prevent debris entering oil passages.
- Ensure nozzle orientation matches factory spray direction toward the piston underside.
- Torque fasteners to the specification in the Cummins service manual.
- Manually prime the oil system and verify oil pressure on first start.
- Aftermarket pistons/rods: Check for physical clearance with the squirter and adjust per manufacturer guidance.
Why Buy From CPP Diesel
- ESN-verified fitment support from diesel specialists
- Fast shipping, easy returns, competitive pricing
- Deep inventory of complementary Cummins valvetrain and bottom-end parts
FAQ
How many nozzles do I need?
Six per engine—one for each cylinder. This listing is for a single nozzle.
Will this fit both 12-valve and 24-valve 5.9L Cummins?
Yes. It covers 1994–1998 12V and 1998.5–2002 24V applications where Cummins 3937214 is specified. Verify by ESN for edge cases.
Do I need any special tools?
No special tools beyond standard hand tools, torque wrench, and engine assembly best practices. Always follow the Cummins service manual.
