Help : New Transmission Line Flares Leaking

Hey everybody. Replaced corroded transmission cooler lines on my 2005 V6 4.0L yesterday (followed write-ups from this site) and when I finally got finished and turned on the truck - I looked underneath and there were leaks at the new flare nut connections. (pic) Admittedly, I did not use a torque wrench - I just used a 17mm flare wrench - which i thought I made really tight. (17mm flare crowfoot ordered - in order to use my torque wrench)

- is there something other than that I might be missing (i.e. o-rings, teflon tape, pipe dope)


Thanks for your time

 

Don’t use Teflon tape,it can get inside your trans and cause issues in your valve body. If any thing use the stuff that comes in a tube it might help lubricate the threads and let you snug it down better.

 

These don't need to be "really tight". Is it leaking from the around the threaded portion or along the actual tubing (center portion)

I would undue them and inspect the condition of the flared portion of the tubing.

This only operates at about 8psi pressure. You only need to snug it up enough to mate the flare on the tubing to the internal cone of the fitting.

 

check out flare gaskets.

 

OffroadToy : What exactly do you mean for "flare gaskets"? There is nothing I saw on the parts diagram that was posted on other threads that cover this replacement - that is why I am a little concerned I may have missed something.

 

copied from a website:
"Copper flare gaskets are used in the plumbing and heating industries to create a leak-proof seal for gas, oil, air, and water. They can be used with copper, brass, aluminum, and steel tubing, and can be disassembled and reassembled multiple times without affecting the seal.
Copper gaskets are designed to prevent pressurized fluids and gases from leaking out of unsealed mating surfaces. For example, coolant hoses may carry pressurized coolant, while oil lines may carry pressurized oil. Copper is considered a durable and effective gasket material for sealing."

I used them in the aircraft industry on oxygen lines... worked well to stop leaks. Not sure if they're compatible with tranny line flares but something to check out.

 

Thanks for everybody's help...

Re-did the job today and just took special care to make sure the flared lines stayed very straight and flat in the fittings as I tightened the nuts. Well - It worked - and there are no leaks as of now (did a little driving around the block).

Next job is to do the flush and fill procedure and get the right amount of ATF in the system.