How to seal a tapered thread?

[Judo]

I was sort of under the impression a tapered thread - for example BSPT - is self sealing. I have a BSPT fitting in the the isuzu block for turbo oil feed but it's leaking. Is the answer just to do it up tighter or should I be using a thread sealer of some type?

I have locktite 243 if that's a good idea?

Talking about the brass fittings here...



Cheers.

[Judo]

Do I keep going until there is no gap between the brass fittings? I suspect I didn't get it that tight.... (limited space and visibility when doing it up!)

[scarry]

It will never seal without a sealant or thread tape.

Be very careful or you will snap it off.

Brass is quite soft

We use thread tape,but a locktite product will also probably do,someone will chime in for sure with the type to use.

[Blknight.aus]

a tapered thread is supposed to self seal. overuse and overtightening causes damage and prevents it from happening.

loctite 566 or 567 is the most appropriate answer thread tape will work as well,
243 will work but you need to be a little heavy handed with itfor it to work out properly which can make life a little interesting when it comes time to get it out. the 566 and 567 will seal up against a little oil contamination whereas the normal loctites wont.

generally most taper threads should seal up with finger tight+ 1/4-1/2 turn

[Judo]

Thanks guys. I will get hold of some thread sealer.

What's the general consensus on teflon tape for an oil line?

[incisor]

Thanks guys. I will get hold of some thread sealer.

What's the general consensus on teflon tape for an oil line?

i wouldn't use tape... loctite is much better in that situation imho

[Blknight.aus]

if you use it right and make it neat no problems. loctite 567s just faster and easier to use right an neat.

[ramblingboy42]

has everyone forgotten Stag?

smells good too.

[scarry]

Thanks guys. I will get hold of some thread sealer.

What's the general consensus on teflon tape for an oil line?

The other issue,which i forgot to mention, is with thread tape,make sure none gets inside the fitting.It is the last thing you want in an oil line.

That is why, as others have said,locktite is better in this application.

[Blknight.aus]

not in the slightest, its a brilliant goop but there are some applications where there are better goops to use.

If I was only allowed to carry one goop with me yet be expected to at least temporarily fix the most number of problems I would most likely grab a tube of stag.

For things like core plugs, flange seals, splines, dis-ssimilar metal mating faces, its very hard to go past.

In this application the consistency of the stag disrupting the "feel" of the thread winding in and seating counts against using it in my books.