Product Description
Interstate-McBee M-3999820 Crankcase Breather Gasket – 07.5–18 6.7L Cummins
OE-style crankcase breather (CCV) gasket that seals the breather housing to the valve cover on 2007.5–2018 6.7L Cummins ISB engines. Ideal to replace any time you service or replace the crankcase ventilation filter to prevent oil mist seepage and maintain proper crankcase pressure.
- Direct replacement: Interchange with Cummins 3999820 (breather/CCV gasket).
- OE-equivalent construction: Precisely cut sealing media for a leak-free fit.
- Service best-practice: Replace during every CCV filter service to avoid repeat labor.
- Aftermarket value: Interstate-McBee quality at a fraction of OEM boxed pricing.
Specifications
| Manufacturer | Interstate-McBee |
|---|---|
| Part Number | M-3999820 |
| OEM Cross-Reference | Cummins 3999820 |
| Application | Crankcase breather / CCV filter gasket (valve cover interface) |
| Position | Top of engine (breather to valve cover) |
| What’s Included | (1) Breather gasket |
Vehicle Fitment
Fitment is based on engine family; confirm by VIN or ESN for edge-case builds.
- Dodge Ram 2500/3500 with 6.7L Cummins ISB (model years 2007.5–2018)
- Also used on select ISB/QSB 6.7 platforms with the same breather/cover interface
Install Notes
- Remove breather cover, clean mating surfaces thoroughly, and inspect for warpage.
- Install new gasket dry unless otherwise specified by the service manual; avoid over-torque.
- Replace the CCV filter per maintenance interval; pairing filter + gasket minimizes comeback leaks.
Warranty
Interstate-McBee new parts carry manufacturer warranty coverage against defects in materials and workmanship. For terms and claims procedure, contact us prior to installation.
Why Buy From CPP Diesel
- Expert Cummins fitment support with ESN verification
- Fast shipping and easy returns
- Inventory curated for B/ISB service jobs and preventative maintenance
FAQ
Does M-3999820 replace Cummins 3999820?Yes. M-3999820 is an OE-style aftermarket gasket that cross-references Cummins 3999820.
Which model years does this fit?
Designed for 2007.5–2018 Ram 2500/3500 with the 6.7L Cummins ISB. Verify by VIN/ESN if unsure.
Should I replace the gasket when I change the CCV filter?
Yes. Best practice is to replace this gasket whenever the crankcase ventilation (CCV) filter is serviced.
Is sealant required?
Typically no. Install the new gasket on clean, dry surfaces and torque fasteners to spec per the Cummins manual.
Product Videos
Custom Field
YEAR 2007.5-2018
MAKE DODGE
ENGINE 6.7L
