I tried to remove my CDR valve (removed the two bolts that hold it to the intake horn), but it would'nt pull out of the manifold. Can't see down there...

What holds the rubber hose from the bottom of the CDR valve into the manifold?

 

You should be able to remove the manitfold inlet tube and rubber grommet by prying the CDR toward the back of the engine away from the manifold gently. The the CDR slides down into the valley pan tube, usually held in place by a clamp. The tube is held into the Valley pan by a ribbed base.......the tubes will get very brittle so use caution if you intend to remove it from the pan.

 

If it's so difficult to remove (I pulled on it pretty hard and it didn't budge), then how the heck are you supposed to re-install? There's not a lot of room back there for working...

 

How often, or why does a CDR valve need cleaning?

 

Do you know when to service your CDR valve?

All 6.9L and 7.3L diesel engines are equipped with a CDR (Crankcase Depression Regulator) valve. Even the new 7.3L Power Stroke is also equipped with the same valve. The CDR valve is one of the leading causes of head gasket failure in these engines. The CDR valve is responsible for controlling the pressure/vacuum in the engine crankcase, and seperating the oil mist from the air and returning the oil to the crankcase. The CDR valve should be serviced every second oil change or when signs listed below are seen.

When the CDR valve is not properly serviced, engine oil enters the air intake and is drawn into the engine. The diesel engine will burn this oil as fuel, however, it is heavier and thicker than diesel fuel and, having greater BTU output, causes excessive heat in the cylinder. Due to the intake manifold design, most of the oil will migrate to #7 and #8 cylinders; the last two cylinders in the rear by the firewall. The increased temperature here will cause the cylinder head to lift off the gasket and allow water or oil to leak out the back of the cylinder head where it meets the block.

To check your CDR valve, remove the air cleaner hold down bolt and inspect it. If the bolt is covered with engine oil mist, it's time to service your CDR valve! Ford calls this item a "Adapter assembly for Crankcase Ventilation" Part number E3TZ-6A665-A or IH part #1805319C1


To service the CDR wash with a solvent, allow to dry, do not use compressed air to dry. There is a small hole in the CDR back cover, ensure it is clean and open. If black chunks of rubber are visible in the intake, on the screen then the rubber membrane has disintegrated, replace the CDR.

 

I just had to pull kind of hard on mine...on a side note, would a bad CDR leave a lot of oil coating on the inside of the intake and make a turbo look like it's leaking oil?

 

PLC7.3 thanks for the info, owned an IDI for the last 10 years and never did service the CDR but now I certainly will!

 

Powersroke if yours is turbo then the CDR valve should be on the valve cover I believe. Your turbo oil drain should go into the valley pan hole behind the intake where the CDR is normally on a non turbo. You may indead have an oil leak from the turbo seals and that would coat the interior of the turbo pipes/intake.

BCFord of you can afford it replace the CDR.........

Ford calls this item a "Adapter assembly for Crankcase Ventilation" Part number E3TZ-6A665-A
IH part #1805319C1...........cheaper

 

the cdr valve comes out with a little effort ... dont want to sound smart, but , did ya remove the two bolts first?

 

From the original post...

 

I just pulled my CDR on my 84, Ive only owned this truck for a couple of years and it looks like its been serviced...no black chunks or anything like that fell out when I soaked & cleaned it?? Maybe I will buy the kit just in case? Thanks!