Product Description
CUMMINS 3999820 OEM CRANKCASE BREATHER GASKET (CCV FILTER GASKET) – ISB 6.7L (2007.5–2024)
The Cummins 3999820 OEM crankcase breather gasket is the factory CCV (crankcase ventilation) filter gasket used on 2007.5–2024 Ram 2500/3500 trucks with the 6.7L ISB Cummins. Any time you replace the CCV filter or remove the breather housing, this genuine Cummins gasket restores a leak-free seal between the breather/CCV assembly and the valve cover, helping prevent oil mist seepage, crankcase pressure loss, and messy engine bays.
Built to Cummins material and thickness specs, the 3999820 gasket is engineered to handle crankcase vapors, temperature swings, and long service intervals. Pair it with a fresh CCV filter and proper torque on the breather cover, and you get OEM-level sealing and emissions performance that cheap knockoffs can’t match.
Key Benefits
- Genuine Cummins 3999820 – not a reboxed aftermarket copy.
- Direct-fit CCV / breather gasket for 6.7L ISB Ram applications.
- Prevents oil mist seep and vapors around the breather/valve cover interface.
- Maintains proper crankcase ventilation and helps protect turbo, intercooler, and intake from excess oil contamination.
- Designed for EPA13+ 6.7L ISB/QSB platforms commonly used in Ram 2500/3500 and industrial applications (verify by ESN).
Fitment Details
Verified Automotive Fitment:
- Engine: 6.7L Cummins ISB (24V common-rail)
- Chassis: Ram 2500 / Ram 3500
- Model Years (typical): 2007.5–2024 (confirm by VIN/ESN for late running changes)
- Location: Gasket between CCV / breather housing and valve cover
- Quantity: 1 gasket per engine (sold individually)
Industrial / Off-Highway:
- Common on EPA13+ Cummins ISB/QSB 6.7L engines using the later-style breather/valve cover assembly.
- Always confirm by engine serial number (ESN) and breather housing part number for industrial and equipment applications.
When to Replace the 3999820 CCV Gasket
- Every time you replace the crankcase ventilation (CCV) filter.
- Any time the breather/CCV cover is removed from the valve cover.
- If you see oil seepage or staining around the breather perimeter.
- After breather housing service, cleaning, or replacement.
Installation & Service Notes
- Clean both the valve cover sealing surface and the breather housing before installing the new gasket.
- Install the gasket dry unless the Cummins service procedure specifies otherwise.
- Seat the breather evenly and torque fasteners in a crisscross pattern to factory spec.
- After the first heat cycle, visually inspect for any fresh oil seep; recheck fastener torque if needed.
Cross-Reference & Related Cummins Parts (Internal Links)
Keep your 6.7L Cummins top end sealed and breathing correctly with these related genuine Cummins parts available at CPP Diesel:
- CUMMINS 3975818 OEM ENGINE OIL COOLER – ISB 6.7L (2007.5–2024)
- CUMMINS 4955354 OEM UPPER ENGINE GASKET KIT – ISB 6.7L (2007.5–2018) STANDARD THICKNESS
- CUMMINS 4955366 OEM PISTON RING SET (STANDARD) – ISB 6.7L (2007.5–2015)
- CUMMINS 3959574 OEM PISTON COOLING NOZZLE PLUG (DELETE PLUG) – RAM 5.9L/6.7L (2003–2018)
- CUMMINS 5264566 OEM INTAKE AIR HEATER GASKET (INTAKE PLENUM / CONNECTION) – ISB 6.7L (2007.5–2018)
Specifications for cummins 3999820
| Brand | Cummins Genuine Parts |
| Part Number | 3999820 |
| UPC | 193807144395 |
| GTIN | 0193807144395 |
| Application | 6.7L Cummins ISB Ram 2500/3500 (2007.5–2024); ISB/QSB 6.7 EPA13+ industrial (verify by ESN) |
| Function | Crankcase breather / CCV filter gasket between breather housing and valve cover |
| Cross Reference | Cummins 3999820 (OE); Interstate-McBee M-3999820; PAI 132043 / 132043OEM (for reference only) |
| E-Codes / Emissions Family | EPA13+ 6.7L ISB/QSB platforms (confirm by ESN for exact calibration) |
| Shipping Info | Approx. 0.1 lb; ships in a flat protective mailer or small parcel; shipping calculated at checkout (typical standard ground) |
| Package Dimensions | Approx. 4.80" (W) x 4.80" (D) x 0.13" (H) |
| Country of Origin | USA (country of origin may vary by production batch) |
| Prop 65 | Yes – Cancer and Reproductive Harm. See www.P65Warnings.ca.gov. |
FAQ
Will this fit my 2007.5–2024 Ram 6.7L Cummins?
Yes. Cummins 3999820 is the OE crankcase breather (CCV) gasket used on most 2007.5–2024 Ram 2500/3500 trucks with the 6.7L ISB Cummins breather/valve cover assembly. For late-year running changes or industrial applications, always verify by VIN or engine serial number (ESN).
Should I replace the gasket every time I change the CCV filter?
That’s best practice. Any time the breather/CCV housing is removed, the old gasket can take a set or tear. Replacing it with a new 3999820 gasket ensures a clean seal and reduces the chance of future oil seep or crankcase pressure leaks.
Does this part include the CCV filter or breather housing?
No. This listing is for the gasket only. The crankcase ventilation (CCV) filter and breather/valve cover assembly are sold separately. Pair this gasket with your preferred CCV filter for a complete service.
Is CUMMINS 3999820 a genuine OEM part or aftermarket?
This is a genuine Cummins OEM gasket sourced through CPP Diesel. It is not an aftermarket copy or private-label replacement, so you get the exact geometry and material that Cummins designed for this breather system.
Can this gasket be used on industrial ISB/QSB 6.7 engines?
Yes, 3999820 is commonly used on EPA13+ ISB/QSB 6.7 applications that share the same breather/valve cover design. However, industrial and equipment engines can vary, so always confirm by ESN and parts catalog before ordering.
