Servicing a "cleanable" PCV Valve

[Michael Mayben]

I forgot about posting this thread!!! And the write-up I did is on the desktop computer in the office, we're camped on the oregon coast and I don't have the text here but I do have some pics and notes on this box.

Here's the notes I made for the writ-up a few years back, along with some pics. It's real simple to do, just be careful and maintain the correct component orientation as it comes apart:

ac sparkplug pcv valve detail:


stamped: ac sparkplug type cv 619; “ihc 967997-r91”

use 13/16” wrench to take apart.

Pay attention to spring location in relation to the shuttle valve.

Clean all carbon/oil/sludge accumulation with carb cleaner and compressed air.

Inspect valve “seat” inside body.

Use welding tip cleaner to clean accumulated sludge out of small hole through center of the shuttle valve.

Re-assemble dry.

 

[Michael Mayben]

This is the unit disassembled...ya must re-assemble the components in the same order after cleaning the guts!

 

[Michael Mayben]

The secret ingredient here is cleaning the small orifice in the shuttle valve, if ya don't clean it out, you are wasting time even servicing the valve. I use a welding tip cleaner for that.

There are multiple versions of this type pcv that were used on not just IH stuff but many engines back in the day. Only difference would be in the calibration of the spring, the diameter of the metering orifice, and the type of threaded "mount" used on the body. But they all come apart the same way. You have to really look for the parting line on the two piece body...but it's there!

 

[Michael Mayben]

Typical sludge/carbon accumulation inside the body. I use a rotary wire brush o0n the outside of the parts to burnish all the mung off, and a wire brush inna rotary handpiece (dremel or pnuematic) to get down inside and sterilize.

Depending upon vehicle application/engine application, this type valve can be found in many mounting positions on both I-4 and sv engines over the years before the shift was made to the "throwaway" pcv valve. And that was dependent upon whether the pcv was the "open" type or the later "closed" type. The first gen throwaway valves were a "screw-in" type before the change was made to the "push-in" valve found in either a valve cover grommet or in the grommet mounted in the baffled are at the rear of the lift chamber cover on the sv apps.