Product Description
Cummins 3947530 — Intake Manifold Cover Gasket / Intake Plenum Gasket
MPN: 3947530 | Also Known As: intake plenum gasket, intake manifold cover gasket, intake horn gasket (large) | Position: Between intake plenum/cover (grid heater plate) and cylinder head
Why This Part
- ✓ OE sealing to keep boost-tight seal and prevent unmetered air leaks.
- ✓ Direct-fit for Ram 5.9L/6.7L ISB applications.
- ✓ Durable construction for heat and compression resistance.
- ✓ Ideal anytime the intake plenum/cover or grid heater is removed.
Quick Specs
| Type | Intake manifold cover / plenum gasket |
|---|---|
| OE Part # | 3947530 |
| Qty Required | 1 per engine (sold individually) |
| Use Case | Replace when removing intake cover/grid heater or if leaks are detected |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 2003–2007 | Ram 5.9L ISB (24V Common-Rail) | Ram 2500/3500 |
| 2007.5–2024 | Ram 6.7L ISB (24V Common-Rail) | Ram 2500/3500 |
Notes: Cummins catalogs show this gasket used primarily on EPA13 ISB/QSB 6.7 variants; late-year trucks can have running changes—verify by VIN/ESN.
Often Paired With
- Intake air heater gasket: Cummins 5264566 (grid heater to cover)
- Heater grid: Cummins 3969987
- Plenum/cover assemblies: Cummins 5335502, Mopar 68069387AA / 68290470AA
What’s In The Box
- (1) Genuine Cummins Intake Manifold Cover/Plenum Gasket (3947530)
Install Tips
- Clean mating surfaces; avoid gouges that can cause boost leaks.
- Follow torque sequence/spec for the plenum cover; recheck fasteners after heat cycle if specified.
- Any time the grid heater or cover is removed, replace this gasket.
FAQ
WILL THIS FIT BOTH 5.9L (2003–2007) AND 6.7L (2007.5–2024) RAMS?Yes—this gasket is used across common-rail 5.9L and 6.7L applications. Always confirm by VIN/ESN, especially on late-model trucks.
IS THIS THE LARGE “PLENUM/INTAKE COVER” GASKET?Correct—this is the large gasket that seals the plenum/cover (grid heater plate) to the cylinder head.
DO I NEED ANY OTHER GASKETS WHEN I REMOVE THE COVER?If you separate the grid heater from the cover, you’ll also need the intake air heater gasket (Cummins 5264566).
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3947530 for proper sealing and durability.
WHAT SYMPTOMS POINT TO A LEAK HERE?Hissing under boost, oily residue at the seam, or unexplained boost loss—replace the gasket and torque to spec.
