Replace the discontinued Ford crankcase ventilation valve on your 6.9L or 7.3L IDI diesel with this aftermarket CDR valve from SWAG Performance. The CDR valve, also known as the crankcase depression regulator or crankcase vent valve, helps regulate crankcase pressure and routes blow-by vapors back into the intake system for proper engine ventilation.
This aftermarket replacement is designed for Ford 6.9L and 7.3L IDI diesel engines and is a cost-effective solution now that the original Ford Motor Company valve is discontinued. It is ideal for IDI diesel owners repairing oil seepage, excessive crankcase pressure, intake oil residue, or aging original ventilation components.
What the CDR Valve Does
The CDR (Crankcase Depression Regulator) valve is a critical emissions and ventilation component found on Ford 6.9L and 7.3L IDI diesel engines. It manages crankcase pressure by routing blow-by gases back into the intake system for combustion while preventing excessive oil vapor from entering the intake manifold.
A failing or clogged CDR valve can contribute to:
- Excessive oil in the intake system
- Oil-soaked air cleaner assemblies
- Increased exhaust smoke
- Rough idle or poor engine performance
- Excessive crankcase pressure
- Oil leaks from seals and gaskets
Replacing a worn CDR valve can help restore proper engine ventilation and improve overall drivability.
Features & Benefits
- Direct-fit aftermarket replacement for OEM Ford E3TZ-6A665-A
- Fits both 6.9L and 7.3L IDI diesel engines
- Helps regulate crankcase pressure correctly
- Reduces excessive oil vapor entering the intake
- Supports cleaner engine operation
- Ideal for restoration, maintenance, or daily-driven IDI trucks
- Cost-effective alternative to discontinued OEM Ford units
Vehicle Fitment
Fits Ford and International IDI diesel applications including:
- 1983–1987 Ford F-250 / F-350 6.9L IDI Diesel
- 1988–1994 Ford F-250 / F-350 7.3L IDI Diesel
- 1990–1994 Ford F-Super Duty IDI Diesel
- 1988–1994 Ford E-Series Vans with 7.3L IDI
- Additional International / Navistar IDI applications
Note: Some factory turbocharged 1993–1994 IDI applications may use a different crankcase ventilation configuration. Verify your original part number and setup before ordering.
Installation Notes
This valve mounts at the rear of the intake manifold and connects directly to the crankcase breather tube. For best results, inspect or replace the CDR grommet/seal during installation to prevent vacuum leaks or oil seepage.
If your engine shows signs of oil accumulation in the intake or excessive crankcase pressure, replacing the CDR valve is strongly recommended as part of routine IDI diesel maintenance.
Cross Reference Part Numbers
- Ford: E3TZ-6A665-A
- International: 1805319C1
- E3TZ6A665A
Why IDI Owners Replace These
As OEM Ford IDI components continue to become obsolete, maintaining proper crankcase ventilation has become increasingly difficult for restoration and work-truck owners. This aftermarket replacement helps keep classic 6.9L and 7.3L IDI diesels on the road without relying on scarce discontinued Ford inventory.
