Product Description
CUMMINS 3969988 OEM Intake Heater Grid Gasket – 5.9L Cummins (1989–2007)
The Cummins 3969988 OEM Intake Heater Grid Gasket is a genuine replacement sealing gasket designed for 1989–2007 5.9L Cummins diesel engines. Installed between the intake heater grid and intake plate, this gasket provides a critical seal that helps prevent boost leaks, maintains proper airflow, and ensures reliable cold-weather starting performance.
Whether you're replacing the factory heater grid, servicing injectors, performing a grid heater delete, or reinstalling the intake horn, replacing the gasket is highly recommended. The Cummins 3969988 gasket is manufactured to OEM specifications for proper fitment and long-lasting durability on both 12-valve and 24-valve Cummins applications.
Features
- Genuine Cummins OEM replacement gasket
- Designed for intake heater grid and intake plate sealing
- Helps prevent boost and intake air leaks
- Maintains proper cold-start performance
- Direct-fit OEM replacement
- Heat-resistant gasket construction
- Ideal for heater grid service and replacement
- Recommended whenever the intake horn or heater grid is removed
- Fits both 12-valve and 24-valve 5.9L Cummins engines
- Sold individually
Fitment
- 1989–1998 Dodge Ram 5.9L Cummins 12-Valve
- 1998.5–2002 Dodge Ram 5.9L Cummins 24-Valve
- 2003–2007 Dodge Ram 2500 & 3500 5.9L Common Rail Cummins
- Industrial and B-Series Cummins applications where applicable
- Factory heater grid equipped 5.9L Cummins engines
Note: This gasket is sold individually. Many 24-valve applications require two gaskets during heater grid or intake horn service. Always verify your application before ordering.
What's Included
- (1) Genuine Cummins 3969988 Intake Heater Grid Gasket
Specifications
- Manufacturer: Cummins
- Part Number: 3969988
- Component Type: Intake Heater Grid Gasket
- Function: Seals Heater Grid to Intake Plate
- Engine Compatibility: 5.9L Cummins 12V and 24V
- Model Years: 1989–2007
- Material: OEM Heat-Resistant Gasket Material
- Installation Location: Intake Horn / Heater Grid Assembly
- Sold As: Individual Gasket
- Application: Dodge Ram 2500 and 3500 with 5.9L Cummins
Cross Reference Numbers
3969988, 3913552, 3931604, 3938158, 4429352
FAQ
Will this gasket fit both 12-valve and 24-valve Cummins engines?
Yes. The Cummins 3969988 gasket is used on 1989–2007 5.9L Cummins engines, including both 12-valve and 24-valve applications.
Should I replace this gasket whenever the heater grid is removed?
Yes. Cummins recommends replacing the gasket whenever the heater grid or intake horn is removed to ensure a proper seal and prevent future boost leaks.
How many gaskets do I need?
Most 1989–1998 12-valve applications require one gasket, while many 1998.5–2007 24-valve applications require two gaskets during heater grid service. Always verify your specific application before installation.
Can a leaking heater grid gasket cause performance issues?
Yes. A failed heater grid gasket can create intake air leaks and boost leaks that may negatively affect performance and cold-weather operation.
Is this a genuine Cummins part?
Yes. Part number 3969988 is a genuine OEM Cummins replacement gasket designed to meet factory specifications.
