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6.9L Diesels Technical discussion of topics related to vehicles powered by the 6.9 Liter In-Direct Injection Navistar engines.

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Old 08-15-2006, 11:30 PM   #1 (permalink)
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Proceedure for cleaning the CDR

I figure that while I still remember how to tear down the PowerSmoke.....

What's the steps to teardown and clean the CDR? I have on the in the intake tube to my Hypermax turbo. It probably could use a cleaning.
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Old 08-15-2006, 11:48 PM   #2 (permalink)
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Re: Proceedure for cleaning the CDR

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.

Ford calls this item a "Adapter assembly for Crankcase Ventilation" Part number E3TZ-6A665-A

IH part #1805319C1

The part # for the rubber tube on the CDR... Retainer # E8TZ 6A892A Might want to check IH for part #.......
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Old 08-16-2006, 09:46 AM   #3 (permalink)
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Re: Proceedure for cleaning the CDR

Ok sounds like I really need to service that CDR then, there is a film of oil inside the intake tube to the turbo. The CDR is mounted to a flange on this tube.

Does the CDR come apart in an orderly fashion to check it's internal components and for cleaning?
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Old 08-16-2006, 11:21 AM   #4 (permalink)
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Re: Proceedure for cleaning the CDR

They don't come apart. You clean the unit through the 2 holes.

My recomendation is to buy a new one, and then clean it on a regular basis. That way you know that you are starting with a good, newer part rather than an unknown unit.
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Old 08-16-2006, 11:44 AM   #5 (permalink)
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Re: Proceedure for cleaning the CDR

Should a generic parts house have this unit, like Schmucks or AutoZone?

The tube leading to the CDR is coming from an elbow on the valve cover.
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Old 08-16-2006, 01:28 PM   #6 (permalink)
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Re: Proceedure for cleaning the CDR

They are common enough that parts stores may carry them. They will probably list it as a PCV valve.
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Old 08-16-2006, 01:36 PM   #7 (permalink)
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Re: Proceedure for cleaning the CDR

Ok, if I can't get one quickly, what solvent do I use to clean out the CDR?
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Old 05-26-2011, 07:50 AM   #8 (permalink)
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diesel fuel perhaps?
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Old 05-26-2011, 08:41 AM   #9 (permalink)
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people have destroyed them with strong solvents so it is probably a very bad idea to use anything stronger than diesel fuel.
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