Testing CDR valve for 6.9 or 7.3 I.d.i.

Testing CDR valve for 6.9 or 7.3 I.D.I.
Test at your own risk

[@dallasstar6533]

I've got 2 7.3 Idi s , pour a bucket of diesel and put the sucker in that , fixed them both , keep scrubbing it and shaking out the buildup till no more oil comes out the tiny hole, test with breath blowing through , while sticking index finger through middle , that's on diaphram plate , if it pushes out when blowing in easy and holds pressure while you are still blowing or covering the hole, it's good to go. Diesel has lubricants in it so it's safe for diaphram

[@mikecorleone6797]

Have you seen the price of diesel lately?… my truck is running on oil changes right now..

[@KrazyKuul111]

I am able to move the diaphragm with my own breath. Just pressed my lips up to it. Mine wasnt very dirty so I didnt get much flavor unfortunately. Seems to be sealed, if you can blow air through the hole and it leaks through then you must have a tear in the diaphragm and need to replace it.

[@Taydrum]

I tested my CDR valve diaphragm, and its intact, and in fairly good condition. The CDR valve however is still stuck open and pours oil in the intake. Just because the diaphragm works doesn't mean the valve does, but it's a start

[@Uriah625]

Sure, there are other things to consider. For the lack of a better word, the "tin can top" part of the diaphragm could be damaged or the spring could be broken. The thing is pretty simple, and this test should help determine if it is working or what the problem may be.

[@Taydrum]

springs good, its clean, but for some reason the spring isn't strong enough to close the valve. I ended up ordering a new one, it never came, so I took the old one and filled it with steel wool to scrub the oil from the air, and reinstalled it. Works pretty good so far

[@stevewalton7668]

You didn't even test it!