Product Description
Genuine CUMMINS 3922072 OEM FRONT/SIDE EXPANSION PLUG for 5.9L B-series engines seals the large coolant bores at the front and side of the block, helping stop annoying coolant seepage before it becomes an overheating or engine-damage issue. This steel cup freeze/core plug is the same part you’d get over the Cummins dealer counter and is a direct replacement for the factory plug on 1989–2002 Dodge Ram 2500/3500 with 5.9L Cummins, plus many 3.9L/5.9L/8.3L industrial and off-highway engines.
Key Features
- OEM Cummins steel cup expansion (freeze/core) plug for front/side block coolant bores.
- Direct-fit for 1989–2002 5.9L Cummins Ram (12-valve 6BT and 24-valve ISB VP44) when used in the correct locations.
- Correct press-fit geometry to maintain a positive seal and help prevent coolant leaks.
- Corrosion-resistant construction for long service life in harsh coolant environments.
- Ideal when refreshing high-mileage engines or repairing rusty/pitted factory plugs.
Fitment Details
Primary Automotive Fitment (Front/Side Block Locations):
- 1989–1993 Dodge Ram 2500/3500 – 5.9L 12V Cummins (6BT, VE pump)
- 1994–1998 Dodge Ram 2500/3500 – 5.9L 12V Cummins (6BT, P7100)
- 1998.5–2002 Dodge Ram 2500/3500 – 5.9L 24V Cummins ISB (VP44)
Common Engine Families (Industrial / Off-Highway / Marine):
- Cummins B3.9 / 4BT3.9 / B5.9 / 6B5.9
- Cummins 4BTA3.9 and related B-series variants
- Select Cummins C8.3 and industrial/aggregated equipment using the above engines
Note: Exact locations and quantities can vary by engine serial number (ESN) and application. Always verify the plug size and count against your specific engine before ordering a full set.
Cross-Reference & Related Cummins Parts (CPP Diesel)
This plug is commonly used alongside other Cummins expansion plugs when doing a full block refresh. Pair it with these genuine Cummins options on CPP Diesel:
- CUMMINS 3920706 OEM EXPANSION PLUG (TURBO DRAIN) – RAM 5.9L/6.7L
- CUMMINS 3914035 OEM EXPANSION PLUG (SIDE OF BLOCK) – 5.9L 12V/24V
- CUMMINS 3900955 OEM EXPANSION PLUG (FREEZE PLUG – DIPSTICK LOCATION) – 5.9L
- CUMMINS 3900687 OEM REAR CAM EXPANSION PLUG – 5.9L 12V/24V
Identification Cross References (for reference only): 3812090, 3900965, 040093, M-3922072, MCBM-3922072.
What’s Included
- (1) Genuine Cummins expansion plug – part number 3922072
Installation Notes
- Drain coolant and thoroughly clean the bore; remove rust, scale, and old sealant.
- Use an appropriate driver to press the plug in square to the bore; do not distort the cup.
- Follow Cummins service information for your ESN regarding sealant use (many locations install dry on a clean bore).
- After installation, refill and bleed the cooling system, then pressure-test to check for leaks.
- On rusty or high-mileage engines, consider replacing all block plugs at the same time.
Specifications for cummins 3922072
| Brand | Cummins (Genuine OEM) |
|---|---|
| Part Number | 3922072 |
| Type | Steel cup expansion plug (freeze/core plug) |
| Primary Engine Families | B3.9 / 4BT3.9 / B5.9 / 6B5.9, 4BTA3.9, select C8.3 applications |
| Automotive Fitment | 1989–2002 Dodge Ram 2500/3500 5.9L Cummins (12V & 24V VP44), front/side block locations (verify ESN) |
| Nominal Diameter | Approx. 2.25" (57.15 mm) cup plug (front/side block locations) |
| UPC | 0633010356746 |
| GTIN | 0633010356746 |
| Cross Reference | 3812090, 3900965, 040093, M-3922072, MCBM-3922072 |
| Package Weight (approx.) | 0.09 lb (0.04 kg) |
| Package Dimensions (approx.) | 1.60" W × 2.70" H × 2.40" D (shipping carton) |
| Shipping Method | Ships from CPP Diesel; carrier and cost calculated at checkout based on destination and service level. |
| E-Codes / Emissions | Not emissions-controlling; no specific E-codes applicable. |
| Prop 65 | Yes – WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov |
FAQ
WILL THIS FIT MY 1989–2002 5.9L CUMMINS RAM?
Yes. Cummins 3922072 is the correct OEM front/side block expansion plug used on most 1989–2002 5.9L Cummins Ram 2500/3500 applications (12-valve and 24-valve VP44), when used in the proper locations. Because plug counts and positions can vary, we still recommend confirming by VIN/ESN or measuring your existing plug before ordering a complete set.
IS THIS A GENUINE CUMMINS PART OR AFTERMARKET?
This listing is for a genuine Cummins 3922072 expansion plug, not a generic aftermarket substitute. That means OEM material spec, geometry, and durability matched to the original engine design.
DO I NEED TO USE SEALANT ON THE PLUG?
Many Cummins procedures install this plug dry in a clean, smooth bore. Some service information allows a thin coat of non-hardening sealant. Always follow the Cummins service manual for your specific ESN, and pressure-test the cooling system after installation to verify a leak-free seal.
HOW MANY 3922072 PLUGS DOES MY ENGINE NEED?
The number of 3922072 plugs used per engine depends on the casting and application. Some engines use multiple plugs across the front and side of the block. Check your engine visually or consult Cummins with your ESN to confirm how many you should replace during a refresh.
WHAT OTHER CUMMINS PLUGS SHOULD I REPLACE AT THE SAME TIME?
On a high-mileage or rusty engine, it’s smart to replace the rear cam plug and side/dipstick-location plugs at the same time. CPP Diesel stocks genuine Cummins options like 3920706 (turbo drain/core plug), 3914035 (side-of-block plug), 3900955 (dipstick-side plug), and 3900687 (rear cam expansion plug) so you can refresh the whole set while the coolant is drained.
CAN THIS PLUG BE USED ON INDUSTRIAL OR MARINE B-SERIES ENGINES?
Yes. 3922072 appears across a wide range of B3.9, 4BT3.9, B5.9, 6B5.9, 4BTA3.9 and some C8.3 engines in industrial, agricultural, and marine equipment. Because casting details change by model, always confirm by engine serial number and plug diameter before ordering.
