Product Description
The CUMMINS 3927948 OEM 12MM MAIN BEARING CAP BOLT is designed for 1998.5–2018 5.9L and 6.7L Cummins diesel engines. This genuine Cummins fastener is engineered to properly secure the main bearing caps to the engine block while maintaining factory clamping force, durability, and reliability.
Use this part during engine rebuilds, bottom-end repairs, crankshaft service, or when replacing damaged or stretched main cap hardware. Proper fastener replacement helps maintain correct bearing alignment and engine integrity. Always verify fitment by engine serial number before ordering.
FEATURES
- Genuine Cummins OEM main bearing cap bolt
- 12mm factory-specification fastener
- Direct-fit replacement for applicable Cummins engines
- Designed to maintain proper main cap clamping force
- Ideal for engine rebuilds, repairs, and bottom-end service
- Manufactured to Cummins OEM specifications
FITMENT
- 1998.5–2002 Dodge Ram 2500/3500 5.9L Cummins 24-Valve
- 2003–2007 Dodge Ram 2500/3500 5.9L Cummins Common Rail
- 2007.5–2018 Ram 2500/3500 6.7L Cummins
- Select Cummins ISB, QSB, and commercial engine applications
WHAT'S INCLUDED
- 1 Cummins 3927948 OEM 12mm Main Bearing Cap Bolt
CROSS-REFERENCE AND RELATED PRODUCTS
- Cummins 3927948
- Cummins Main Bearing Components
- Cummins Crankshaft Service Parts
- Cummins Bottom-End Rebuild Components
SPECIFICATIONS
- Manufacturer: Cummins
- Part Number: 3927948
- Part Type: Main Bearing Cap Bolt
- Fastener Size: 12mm
- Engine Compatibility: 5.9L Cummins, 6.7L Cummins
- Fitment Years: 1998.5–2018
- Vehicle Application: Dodge Ram / Ram 2500 and 3500
- Condition: New OEM Cummins
- Installation Type: Direct Replacement
FAQ
Will this main bearing cap bolt fit my engine?
This bolt fits many 1998.5–2018 5.9L and 6.7L Cummins applications. Always verify fitment using your engine serial number before ordering.
Is this a genuine Cummins fastener?
Yes. Cummins 3927948 is a genuine OEM Cummins main bearing cap bolt manufactured to factory specifications.
What is included?
This listing includes one Cummins 3927948 OEM 12mm main bearing cap bolt.
Should main cap bolts be replaced during an engine rebuild?
Many engine builders recommend replacing critical fasteners during major engine service to help ensure proper clamping force and long-term reliability.
Can I reuse old main bearing cap bolts?
Fastener reuse recommendations vary by application and condition. Always follow Cummins service procedures and inspection guidelines during engine assembly.
Do I need any related parts?
Inspect main bearings, thrust bearings, crankshaft surfaces, bearing caps, seals, and related engine hardware during service and replace worn components as necessary.
