Restore reliable crankcase ventilation and maintain proper engine performance with this OEM Ford 7.3L IDI Crankcase Vent / Crankcase Depression Regulator (CDR) Valve, part number E3TZ-6A665-A. Designed to meet original equipment standards, this direct-fit valve is essential for regulating crankcase pressure on classic 6.9L and 7.3L IDI Ford diesel engines.
? What It Is
The crankcase vent / CDR valve manages pressure inside the engine’s crankcase by regulating blow-by gases, preventing excessive oil vapor and unburned fuel from entering the intake system. A properly functioning valve helps:
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Reduce harmful emissions,
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Prevent oil-soaked air cleaners,
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Maintain smooth running idle and overall engine performance.
This valve attaches directly to the rear of the intake manifold on 6.9L/7.3L IDI diesel engines. As crankcase pressure builds during normal operation, the CDR valve opens to vent gases back into the intake for clean combustion.
Typical Applications
This OEM crankcase vent / CDR valve fits a variety of classic Ford vehicles equipped with naturally aspirated IDI diesels, including:
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Ford F-250 / F-350 trucks
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E-250 / E-350 Econoline vans and Club Wagons
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Other 6.9L & 7.3L IDI diesel-powered applications from 1983–1994 (check specific fitment).
⚠️ Note: 1993+ turbocharged IDI trucks may use a different crankcase setup and require a separate valve configuration.
Installation Notes
This valve mounts at the back of the intake manifold and connects to the crankcase breather tube. If your original valve is clogged, cracked, or leaking oil into the intake, replacing it will typically eliminate those issues and restore normal engine operation.
Don’t let a failed crankcase vent or CDR valve drag down your diesel’s performance. This genuine Ford E3TZ-6A665-A Crankcase Vent / CDR Valve is a direct OEM replacement designed to restore proper crankcase pressure regulation on your 6.9L or 7.3L IDI engine — the right solution for dependable daily driving, work, or restoration projects.
