Loctite 567 cure time

[Michael Burbidge]

I'm having a heck of a time with leaky master brake cylinder fittings. I'm going to try loctite 567. Is there a cure time before putting brake fluid back in?

Michael

[VRBaker]

Me too. Tried 567 and a couple other - no joy. Finally gave up, took my tech advisers suggestion and used teflon tape , that worked....
Vic

[Auburntsts]

I'll pile on. I redid mine a few days ago with 567 and the squeeze out is still "wet". Should it have "firmed" up by now?

[Bevan]

I could be wrong but I seem to recall that the connection can be put into service immediately. Check the fine print.


Bevan

[Mark Burns]

Originally Posted by Bevan

I could be wrong but I seem to recall that the connection can be put into service immediately. Check the fine print.


Bevan

Yep, 567 is good stuff. It does take a few days to fully set up but usually it will seal fine even when still "wet". But I didn't use any on my airplane.

For brake fittings that are pipe thread I use Loctite 545 Hydraulic sealant.
This stuff is better for the smaller "finer" threads. It cures pretty fast.


Mark

[BillL]

What causes the leak? Notch in threads? Inadequate depth to fully engage the taper?

Anyone know?

[Michael Burbidge]

According to the following directions. Loctite 567 needs to cure for at least 24 hours to reach full strength. It does have immediate sealing strength. But to be safe it sounds like 24 hours would be best.

Also it sounds like cleaning is important.

http://www.kvc.com.my/EnterpriseChan...octite-567.pdf

Michael-

[Dbro172]

After a couple iterations I ended up using proseal fuel tank sealant on one of my fittings to get it to stop the drip

[Lars]

567 is an anaerobic adhesive. The stuff you see around the threads after assembly will never cure fully, because it's exposed to air. The stuff in the joint will cure quickly. Full strength comes after 24 hours, but well before that you'll find that if you try to disassemble the joint it will come apart far more grudgingly than it went together. I use 567 all the time in the hydraulic assemblies I put together at the place that supplies me with the money that I need to keep my RV-7 airborne. It works very well- our environment is 5000 psi and a shake table with 21g acceleration.

[akarmy]

I too used 567, had leaks. Mostly caused by not tight enough fittings. I ended up turning the two fittings in one more rotation and that sealed them up. Fingers crossed, because it ain't no fun head first diving in the front of an 8 to fix leaking brake fittings!