CDR Valve

Reply Subscribe

Thread Tools

Search this Thread

Mar 29, 2006 | 03:46 PM

86diesel-

Thread Starter

Junior User

Joined: Feb 2006

Posts: 54

Likes: 0

CDR Valve

I am servicing my CDR valve and I was wondering how it works. I have it all cleaned up. If I shine a light into either of the ports I can see the light through the other port. Is this normal?

Mar 29, 2006 | 06:56 PM

IHdieselfan

Tuned

Joined: Oct 2005

Posts: 392

Likes: 1

From: Panther Branch, NC

Yes it is normal, if you can see light it needs to be replaced.

Mar 30, 2006 | 09:32 AM

86diesel-

Thread Starter

Junior User

Joined: Feb 2006

Posts: 54

Likes: 0

The CDR valve I pulled off has an AC stamp in it. I guess that means AC Delco? Could this be the wrong valve for this engine or could it be like many other parts and be the same part used for other engines?

Mar 30, 2006 | 10:42 AM

bcford6.9

Senior User

Joined: Mar 2006

Posts: 201

Likes: 0

I cleaned my CDR, first time since I owned the truck. Previously I have noticed blowby comming out of the dip stick tube, I will see if cleaning CDR valve will help?

Mar 30, 2006 | 07:01 PM

86diesel-

Thread Starter

Junior User

Joined: Feb 2006

Posts: 54

Likes: 0

I know someone suggested replacing my CDR valve but I wanted to do a little test before I did. I installed it back on my engine and started it up. I then looked down into the intake while it was running and noticed that there was a noticeable amount of crankcase vapor flowing in from the CDR valve. Should the CDR valve eliminate all vapor from entering the intake or will it let some in? I just want to make sure I need the valve before I buy it. Thanks.