Product Description
The CUMMINS 3978517 OEM CYLINDER HEAD GASKET (.020 MARINE) is designed for 2003–2007 5.9L ISB Cummins diesel engines. This genuine Cummins head gasket provides a reliable seal between the engine block and cylinder head while maintaining proper compression, coolant flow, and oil passage integrity.
Use this gasket when replacing a damaged head gasket, repairing engine overheating damage, rebuilding a cylinder head, or performing a complete engine overhaul. Always verify the correct gasket thickness and application before ordering.
FEATURES
- Genuine Cummins OEM cylinder head gasket
- .020 marine thickness specification
- Designed for common rail 5.9L ISB Cummins engines
- Helps maintain proper combustion sealing and coolant control
- Engineered to OEM Cummins standards
- Ideal for engine repair and rebuild applications
FITMENT
- 2003–2007 Dodge Ram 2500 5.9L ISB Cummins
- 2003–2007 Dodge Ram 3500 5.9L ISB Cummins
- Select marine and industrial 5.9L ISB Cummins applications
WHAT'S INCLUDED
- 1 Cummins 3978517 OEM Cylinder Head Gasket (.020 Marine)
CROSS-REFERENCE AND RELATED PRODUCTS
- Cummins 3978517
- Cummins Cylinder Head Bolts
- Cummins Top-End Gasket Components
- Cummins Valve Cover Gaskets
SPECIFICATIONS
- Manufacturer: Cummins
- Part Number: 3978517
- Part Type: Cylinder Head Gasket
- Thickness: .020 Marine Specification
- Engine Compatibility: 5.9L ISB Cummins
- Fitment Years: 2003–2007
- Vehicle Application: Dodge Ram 2500 / 3500
- Condition: New OEM Cummins
- Installation Type: Direct Replacement
FAQ
Will this head gasket fit my truck?
This gasket fits many 2003–2007 Dodge Ram trucks equipped with the 5.9L ISB Cummins engine. Always verify fitment and gasket thickness before ordering.
Is this a genuine Cummins gasket?
Yes. Cummins 3978517 is a genuine OEM Cummins cylinder head gasket manufactured to factory specifications.
What does the .020 marine specification mean?
The .020 designation refers to the gasket thickness specification used in certain applications. Proper gasket thickness is critical for maintaining compression ratio and piston-to-head clearance.
Should I replace head bolts when installing a new head gasket?
It is recommended to inspect and replace head bolts or studs as required by the engine manufacturer and application.
What are common signs of a failed head gasket?
Symptoms may include coolant loss, combustion gases in the cooling system, overheating, coolant contamination, white exhaust smoke, or loss of compression.
Do I need any related parts?
Inspect cylinder head bolts, valve cover gaskets, intake and exhaust manifold gaskets, coolant hoses, and related sealing components during installation and replace them as necessary.
