cdr valve
Cargo Master
Joined: Mar 2010
Posts: 2,227
Likes: 149
From: Higginsville, MO
if your N/A its under the air cleaner on the back side of the motor near the glow plug relay. looks like a tuna can... there is a bolt holding it down. take it off and soak it in gasoline or mineral spirits/parts cleaner.
Post Fiend
Joined: Feb 2009
Posts: 8,005
Likes: 7
From: Ottawa, Ontario
Gasoline is what you use to clean the thing! That's what i've been using to clean mine for a number of years....
What eats the diaphragm is people shooting compressed air in it. You HAVE to let it air dry.
What eats the diaphragm is people shooting compressed air in it. You HAVE to let it air dry.
Trending Topics
Postmaster
Joined: Nov 2008
Posts: 2,851
Likes: 3
From: Buckley, WA
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
The Best F-150 Deal of Every Trim Level (XL through Raptor)
Joe Kucinski
Postmaster
Joined: Nov 2008
Posts: 2,851
Likes: 3
From: Buckley, WA
i agree, couldnt compressed air cause the hole? or even just really high miles?
Post Fiend
Joined: Feb 2009
Posts: 8,005
Likes: 7
From: Ottawa, Ontario
Compressed air will damage the diaphragm.
My 7.3 has 377k on the original CDR. Before being a member here, I had no idea about the CDR, and only started cleaning it a few years ago. I checked it's operation, and all was good.
My 7.3 has 377k on the original CDR. Before being a member here, I had no idea about the CDR, and only started cleaning it a few years ago. I checked it's operation, and all was good.
Postmaster
Joined: Nov 2008
Posts: 2,851
Likes: 3
From: Buckley, WA
could you remind us on correct testing procedure?? i have 3 of them and i just rotate them out every oil change after sitting in gas and air drying for a while...i guess i dont really need it anymore with my RDT into the exhaust...but seemed to help compared to not running it..
Post Fiend
Joined: Feb 2009
Posts: 8,005
Likes: 7
From: Ottawa, Ontario
Take it out, theres a little vent hole on the bigger face part, put your mouth on that little vent hole, and stick your finger in the hole on the other side (where it connects to the back of the intake) and blow in the vent hole. Your finger should feel the diaphragm inside move. If nothing moves, your CDR is bad.
