Could PCV Valve Threads Be Seized?

[Jim]

I was gonna replace the PCV valve on my oil leaking '97 legacy.
since the valve cover is aluminum and the valve itself is not
I'm concerned about some electrolytic reaction, or whatever
(I'm not a chemist!) causing the threads to be seized and
thus stripped when I take out the old valve. Has anyone
ever had this happen?

TIA Jim

 

[Bob Bailin]

I was gonna replace the PCV valve on my oil leaking '97 legacy.
since the valve cover is aluminum and the valve itself is not
I'm concerned about some electrolytic reaction, or whatever
(I'm not a chemist!) causing the threads to be seized and
thus stripped when I take out the old valve. Has anyone
ever had this happen?

TIA Jim

Doubtful, because of all of the oil vapors that would find their
way into the threads before any corrosion set in. You're more
likely to have a problem with carbon buildup on the threads. If
you find that you need more than 10 ft-lbs of force to unscrew
it (about 1/2 of what it takes to remove a spark plug), consider
using a box wrench and lightly tapping on it with a hammer near
the box end to loosen it up the way an impact wrench would
do the job.

Bob