Following my recent thread about blue smoke, I stumbled across a couple re: CDRs--didn't realize I had such a thing. One recommendation was to remove it and wash it out with gas, but not use compressed air. I did this, then decided to clean it up by wire-brushing the rust. On the face of the unit,in the installed position, I show bare metal enough to read the part number at 3 o'clock, the AC logo at 12 o'clock, and a small hole at 6 o'clock. The hole is about 1 mm in diameter (smaller than a pencil lead) and appears to be round, not irregular. The CDR unit seems to be made of substantial metal -16 ga?- that it shouldn't have rusted through.


Is this hole there by design, or is it a flaw, and I should get a new CDR?

 

CDR??????????

 

CDR-Crankcase Depression Regulator- Lots to learn about this little unit

 

something wanted me to say that hole was supposed to be there. but i just looked at a picture of a new one and do not see it.
so maybe someone drilled it to act as a drain?

 

Yup. First thing is that it is a diesel application. May be of some help to put some info in the initial post, or your signature.

 

Thanks for being the Guinea pig.

I didn't have a clue what he was talking about.

 

Please post the specs of the vehicle you're working on when asking questions.

 

I been working on these diesels for 20+ years. Never heard of it. Learn something new every day

 

CDR is the diesel version of a PCV .