Thread sealant for threaded plugs

[ChrisBennet]

I had a machinist replace the galley plugs on my 911 case with threaded plugs. I assume because the plugs are steel and my case is aluminum that the case will expand more than the plugs so I want to put some sort of flexible sealant on them. Recommendations?

Instead of just the 4 main galley plugs he did every plug he could find, sigh, but that's beside the point. I'm not machinist, but would threaded aluminum plugs have avoided thermal expansion differences and bimetalic corrosion problems? Do such things (aluminum plugs) exist?

-Chris

[john walker's workshop]

there shouldn't be any problem with thermal expansion, due to the small size of the plug. haven't seen any aluminum plugs. they should be sealed to avoid seepage though. i would think that plain old permatex brown aviation sealer would work fine, as long as the plugs were tight enough. you could even use red loctite stud and bearing mount compound.

[Bob W.]

I have used steel plugs in the heads of my 930. I was also concerned with what to seal the threads with. I tried different sealents figuering that if any leaked I would just reseal the plug with a sealent that worked. I used Permitex#2(non-hardening),
teflon tape and loc-tite(red). After about 2 years now none of them has leaked.
I found out later that there are anodized aluminum plugs available from vw hot rod parts vendors that I could have used.
A caution- be careful with aluminum as it is easly galled.
Bob W.

[ChrisBennet]

Thanks all. I want to be able to remove the main galley plugs at some point in the future so I will avoid the red loctite.
-Chris