Product Description
Cummins 3914035 — Expansion Plug (Side-of-Block Core/Freeze Plug)
MPN: 3914035 | Also Known As: core plug, freeze plug, expansion plug | Interchange: 3007635
Why This Part
- ✓ OE cup plug for sealing the block’s coolant jacket openings (side-of-block locations).
- ✓ Direct-fit for 5.9L B-Series 12V/24V truck applications (see fitment below).
- ✓ Durable OE material designed to resist corrosion and coolant pressure.
- ✓ Sold individually; number required varies by engine—verify by ESN/service manual.
Quick Specs
| Type | Engine block expansion (core/freeze) plug |
|---|---|
| OE Part # | 3914035 |
| Interchange | 3007635 |
| Qty Required | Varies by engine (sold individually) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1989–2002 | 5.9L B-Series (12V & 24V) | Ram 2500/3500 |
Industrial/Off-Highway: Used across many B-Series platforms (e.g., 4B/6B/ISB/QSB families). Always confirm by ESN for exact locations/quantity.
Often Paired With
- Coolant & conditioner after service
- Block heater & O-ring (inspect while servicing core plugs)
- Emery cloth/cleaner for bore prep; use sealant only if specified by Cummins
What’s In The Box
- (1) Genuine Cummins Expansion Plug (3914035)
Install Tips
- Drain coolant. Clean the bore to bare metal; remove corrosion/debris.
- Align square; drive in with a proper cup-plug driver until seated to spec (flush/slightly below deck per manual).
- Refill/bleed cooling system; check for leaks and re-inspect after first heat cycle.
FAQ
WILL THIS FIT MY 1989–2002 5.9L CUMMINS RAM?Yes—commonly used as a side-of-block core plug on 1989–2002 5.9L 12V/24V Ram. Always verify by VIN/ESN and service manual for quantity/locations.
HOW MANY PLUGS DO I NEED?The engine uses multiple core plugs; quantity varies by casting. Inspect the block and verify by ESN to order the correct amount.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3914035 expansion plug.
WHAT OTHER ENGINES USE 3914035?It appears across many B-Series applications (4B/6B/ISB/QSB families). For non-automotive/industrial use, confirm by ESN before ordering.
SHOULD I USE SEALANT ON INSTALL?Follow the Cummins procedure for your ESN. Some cup plugs install dry; others call for a specific sealant/light coat. Always prep the bore properly.
