I think I am in need of a new cdr

[purg113]

I have oil in my air filter that is leaking back out the back side of the engine after I shut it down for the night.
how hard are they to change or can I just try cleaning it to see if it will work I dont think it has ever been changed.

 

[Hydro-idi]

If it has never been changed, best bet is to go ahead and buy a new one. They are really easy to change out. I clean mine every time I change oil with a little gasoline in a coffee can. It sure does make a difference when those buggers are clean. Remove two bolts behind intake manifold, tilt, and lift out. Simple as that!

 

[purg113]

Okay I will get that ordered then and try to clean this one a little while I am wating. thanks.

 

[Maverick1701]

cleaning is super easy...I poured some gas in an old tupperware and used that to clean my CDR.

 

[awhtx]

If it has never been changed, best bet is to go ahead and buy a new one. They are really easy to change out. I clean mine every time I change oil with a little gasoline in a coffee can. It sure does make a difference when those buggers are clean. Remove two bolts behind intake manifold, tilt, and lift out. Simple as that!

I wish it was that easy to change!
The CDR had never been removed on my 89 F-SuperDuty. There is a metal band that clamps the hose to the valley pan to the CDR and access is nearly impossible. I removed the 2 bolts and pried up on the driver's side "ear" on the CDR with a large screwdriver until the old hose split. I would suggest you buy a new valley pan hose before you remove the CDR because you're going to need it.

 

[OLDBULL8]

I wish it was that easy to change!
The CDR had never been removed on my 89 F-SuperDuty. There is a metal band that clamps the hose to the valley pan to the CDR and access is nearly impossible. I removed the 2 bolts and pried up on the driver's side "ear" on the CDR with a large screwdriver until the old hose split. I would suggest you buy a new valley pan hose before you remove the CDR because you're going to need it.

Not flaming you. But you removed the CDR the wrong way. No need to remove the clamp on the bottom of the hose. Just remove the two bolts, bend back slightly, twist and pull up, it'll come right up and out of the grommet in the valley pan. There is a plastic piece on the end of the hose that slips into the grommet, see pic. To clean it, best not to use gasoline, use diesel fuel, there is a rubber diaphram inside the CDR, you can blow thru it in one direction and not the other direction, if you can blow thru in both directions then the diaphram is shot and a new CDR is required.

CDR is available from an IH dealer. Crankcase Depression Regulator.
Grommet E3TZ 6A892 A
Rubber tube E8TZ 6A892 A

 

[Silver Burner]

I should check mine out. Never have...

 

[6.9poweredscout]

How do they go bad? What does cleaning them do? Every time I have the intake off my 250 there is oil in the hose coupler. Doesn't smoke but drinks about 3 quarts between oil changes. Could that mean mine is shot?

 

[purg113]

my understanding is they go bad when the rubber diaphram is no good inside so it lets oil and air in to the intake of our engins instead of just air.
cleaning them gets the little particals out of it so you dont get junk built up on the diaphram and make it go bad.

 

[purg113]

okay mine is off and it is shot i have air flow both directions when i blow in it.
now the stupid question can I plug it with something till I get my new one in next week so I am not burning all my oil up or is that just asking for trouble?

 

[bghnkinf350]

When you say you can blow through the CDR, do you mean either larg hole? Every CDR I have had, you can blow through either hole with no resistance.

 

[Hydro-idi]

Whatever you end up doing, do NOT plug up the cdr hole. The cdr allows crankcase gasses to be routed back into the intake. When this is blocked off, there is way too much pressure inside of the engine due to natural blow-by that these engines create (because of high compression ratio). Doing this will cause massive oil leaks from oil pan, rear main seal, and maybe even a runaway situation. It is best to just re-install old cdr and wait for new one to arrive.
Now with the cdr pressure, mine is brand new and I am able to blow air both directions with no resistance so I am not sure how to answer that question. I do know that when I clean mine, oil consumption quickly decreases and blue smoke from tailpipe disappears until I'm due for another oil change.

 

[Hydro-idi]

Also I'm going a bit off topic here.....and some guys on here might frown upon what I have found decreases blow-by with these engines........anyways I pour in a quart of marvel mystery oil for the last few hundred miles of my engine needing an oil change. This cleans the engine internals very well and gets the sludge out. After adding a new PSD filter and oil, I then put a bottle of Engine Restore made for 8 cylinder engines. The first time I did this, I did not notice much improvement. It was after the first 500 miles or so is when I started noticing the difference of the amount of blow-by going back into intake. Before Engine Restore, it would huff quite a bit of blow-by, and this is with an engine around 160k. Now, I can barely see any blowby getting dumped back into air intake. This must mean something! Please don't shoot me down for doing this. Just an idea for anybody looking to decrease blow-by and wake up their old idi again. It worked for me!

 

[awhtx]

When you say you can blow through the CDR, do you mean either larg hole? Every CDR I have had, you can blow through either hole with no resistance.

I can also blow through both large holes easily. There is a tiny hole in the firewall side of the metal canister. I'm pretty sure it is there to vent the canister in order to allow the diaphram to move back and forth. If it wasn't there the diaphram couldn't move because it would create suction as the diaphram tried to move away and pressure as the diaphram tried to move towards the rear of the canister. If you can blow air through that hole the diaphram is ruptured. When I blew in mine and stuck my finger in the large hole that goes to the manifold I could feel the internal parts moving, indicating that the diaphram was good.

 

[awhtx]

Not flaming you. But you removed the CDR the wrong way. No need to remove the clamp on the bottom of the hose. Just remove the two bolts, bend back slightly, twist and pull up, it'll come right up and out of the grommet in the valley pan. There is a plastic piece on the end of the hose that slips into the grommet, see pic. To clean it, best not to use gasoline, use diesel fuel, there is a rubber diaphram inside the CDR, you can blow thru it in one direction and not the other direction, if you can blow thru in both directions then the diaphram is shot and a new CDR is required.

CDR is available from an IH dealer. Crankcase Depression Regulator.
Grommet E3TZ 6A892 A
Rubber tube E8TZ 6A892 A

My old tube and the new one I bought from Ford did not use 2 clamps- only the 1 that attaches the hose to the CDR. The part that inserts into the valley pan was formed as part of the hose. The original one was so dried out that I had to use needle-nose pliers to break it apart and pull the pieces out.