sealing steel plug in aluminum case

[thefitisgay]

i got a leak thats pissing me off i can get it to seal with rtv till it goes through a heat cycle

i think the problem is that the aluminum is moving to much from the heat and the steel isnt so it just sorta pops the rtv off

im thinking of 3 solutions yamabond the right stuff or hylomar

all three arent meant for a threaded plug and i think the only reason yamabond works so great for sealing cases is becuase the case halves expand at the same rate

the plug has a shoulder on it that the brass washer sits on but its not cutting it i tried thread sealant rtv teflon tape and probobly something else im getting ready to jb weld the ----ers shut and just spend 15 bucks to drain the trans

[turbovanman²]

What's this for? Isn't the washer touching the sealing surface, if so, why not? Liquid thread sealer should do the job.

[thefitisgay]

its for an air cooled bike motor one time i even filed the seal surface because i noticedthe first thread was forming a bur so i filed it flat and used a crush gasket from an auto parts store AND black rtv all at the same time

its common the cases crack what kinda dye can i use to see the crack?

[turbovanman²]

its for an air cooled bike motor one time i even filed the seal surface because i noticedthe first thread was forming a bur so i filed it flat and used a crush gasket from an auto parts store AND black rtv all at the same time

its common the cases crack what kinda dye can i use to see the crack?

You can buy tracer dye, then you need a UV light.

[RattFink]

Is it possible to get an aluminum plug?

[RoadWarrior222]

I'd try the red pipe dope they use on natural gas lines.

[turbovanman²]

Is it possible to get an aluminum plug?

Not sure, why not a brass one?

[RoadWarrior222]

Yeah brass might be better.

[thefitisgay]

haha find me a brass plug with 1/2 13 thread

and i was thinking about getting an aluminum plug custom machined

[RoadWarrior222]

http://www.mcmaster.com/#cap-screws/=8vvud5
or
http://www.mcmaster.com/#set-screws/=8vvvf5

It's not uncommon for hardware stores to have threaded brass rod in 1/2" 13tpi.

[thefitisgay]

maybe ill try an aluminum bolt... thanks i didnt think they actually made them