Should I use thread sealant when installing new trim hoses?

[gcarmich]

I'm installing new cylinders and trim hoses. Should I use a Teflon tape, Permatex aviation sealant, or another compound to seal the threads on the hose fittings?

 

[dubs283]

The fittings are flared and require no thread sealant

 

[Scott Danforth]

Hydraulic fittings do not need any sealant (NPT fittings are the exception, however they are poor choice of a fitting)

Your hydraulic cylinders use SAE inverted flare fittings

 

[Bondo]

The fittings are flared and require no thread sealant

Ayuh,..... While I completely agree, no sealant is necessary to keep the oil in the system,......

As much grief as those fittings can be to get apart, when the stainless grows into the aluminum housings,.....
After many discussions with Don S about the virtues of Perfect Seal, at stopping bolts from growing into aluminum housings,....
For the last decade or so, I put abit of Perfect Seal onto any threaded item that I might wanta take apart again someday, includin' the trim line nuts,....

 

[rickasbury]

I just did the same..prior did not have any leaks but when I attached the new cylinders I have some drips- should I have to replace those lines?

 

[Scott Danforth]

I just did the same..prior did not have any leaks but when I attached the new cylinders I have some drips- should I have to replace those lines?

is it a bad line? if yes, replace the line

is it simply not tightened enough? if yes, properly tighten

is it crud on the inverted flare seat? if yes, back off the nut slightly, rotate the line back and forth a bit to clear the crud and retighten

troubleshoot prior to spending money.

 

[rickasbury]

is it a bad line? if yes, replace the line

is it simply not tightened enough? if yes, properly tighten

is it crud on the inverted flare seat? if yes, back off the nut slightly, rotate the line back and forth a bit to clear the crud and retighten

troubleshoot prior to spending money.

Well...I did a lot of screwing with it yesterday and a little research as well. Generally, I'm reading, compression fittings are not to be reused. The flared tubing on these do not have any sort of o ring or seal and that metal, from what I read, is compressed into the male side so once you break that loose it's hard to get a good seal...I got it down to a little drip but really not satisfied with that. I will check the site and get them coming.

 

[rickasbury]

Ayuh,..... While I completely agree, no sealant is necessary to keep the oil in the system,......

As much grief as those fittings can be to get apart, when the stainless grows into the aluminum housings,.....
After many discussions with Don S about the virtues of Perfect Seal, at stopping bolts from growing into aluminum housings,....
For the last decade or so, I put abit of Perfect Seal onto any threaded item that I might wanta take apart again someday, includin' the trim line nuts,....

I will add this to the tool box
Look what I had to do to get this trim nut out!

 

[Scott Danforth]

Well...I did a lot of screwing with it yesterday and a little research as well. Generally, I'm reading, compression fittings are not to be reused. The flared tubing on these do not have any sort of o ring or seal and that metal, from what I read, is compressed into the male side so once you break that loose it's hard to get a good seal...I got it down to a little drip but really not satisfied with that. I will check the site and get them coming.

simply not true.

if that is the case your car would need a complete new brake system every time you remove a caliper.

the SAE inverted flare is one of the most prevalent hydraulic connections in the world.

 

[rickasbury]

simply not true.

if that is the case your car would need a complete new brake system every time you remove a caliper.

the SAE inverted flare is one of the most prevalent hydraulic connections in the world.

Then why is it leaking ? I have pulled calipers before as well but all that tubing is heavier stuff- I don't know what to add- I had one so tight I had to cut it out- the others easily backed off- had much more torque on them when re installed and it's leaking. I have new cylinders so I don't want to suck a bunch of water in them..I pulled the cylinders and put the plugs back in the inlets and nothing is cross threaded as I easily put them in by hand...everything is clean...

 

[Scott Danforth]

Brake lines being steel have thinner walls than the stainless tube used on PTT systems

Regarding leaks, you would have to investigate

Most of the time it's a damaged port cone

 

[boozer1966]

The fittings are flared and require no thread sealant

 

[stresspoint]

use a wire brush on a dremel in the hose fittings to clear any burred surface , you can do the same on the new rams just as a precaution , possibly damaged seat from new although i doubt it. .

FWIW , just in case you did clamp those fittings to 200 ft lb (figure of speech) you may have compressed and cracked the flare, in which case you will have to replace the line that is leaking .but try the dremel approach first.

 

[rickasbury]

use a wire brush on a dremel in the hose fittings to clear any burred surface , you can do the same on the new rams just as a precaution , possibly damaged seat from new although i doubt it. .

FWIW , just in case you did clamp those fittings to 200 ft lb (figure of speech) you may have compressed and cracked the flare, in which case you will have to replace the line that is leaking .but try the dremel approach first.

I did get new lines but went on a little vacation...will get back to it first of the week and hopefully will be back in the water...