How to: Installing a Transmission Temperature Gauge

[CDW6212R]

Above you are seeing the barbed end which is so special, the barbs are larger in diameter than most, and they have a very sharp back edge which bites into a hose.

The push lock fittings used to be very basic, NPT/barbed in various sizes. Now most any hydraulic hose supplier can get dozens of different choices. I like the flare fittings of the OEM(on the radiator and trans) because they don't leak.

The aftermarket flared fittings do commonly leak at the joints that you create, a slight but annoying leak. I think it may be manufacturing tolerances. When you assemble one of those joints next time, look at the female end and notice a "valley" in the bottom where the other end will seat. That space is usable for an o-ring to seal the parts better. I always buy an o-ring for those which fall right into place easily. That seals the joint with far less torque than is required without them.

 

[Four0Sport]

there are also some brake fittings that are compression on one side and barbed for hose on the other. i think we carry them at work, i'll have to take a look. if we do have them, i'll post the part numbers.

 

[CDW6212R]

Don't use compression fittings, those are not good for high pressures, leaking.

 

[Maniak]

What is considered high pressure. My highest "line pressure" on the trans is under 300psi.

~Mark

 

[CDW6212R]

Bingo, the pressure which blows the rubber hoses off a straight line can make leaks in compression fittings. A perfectly prepared joint may do just fine, but those are rare.

 

[Four0Sport]

ive always used compressions fittings to repair trans cooler lines without any leaks

 

[CDW6212R]

Great, what source do you have for the fittings? I didn't have any good fortune with them long long ago on my first cars. I quit using them way back then.

 

[Four0Sport]

ive always used compression fittings to join to hard lines together.. the fittings I saw at work were motormite with a compression fitting on one end and the other end was npt.. which should thread into the T im using on my setup. i have however seen some fittings with half compression half barb, havnt used them though. i need to write this down so i remember to look for them at work tomorrow lol

 

[Four0Sport]

the fitting i am talking about ishere

 

[CDW6212R]

Do they list the push lock fittings, those are the easiest to use?

 

[Four0Sport]

i looked for those, but didnt see any on the site

 

[wingnutt550]

compression fittings and transmission fluid presure

hey guys, I have a couple of thoughts. First is when installing compresion fittings even on new lines you should always use emory cloth or sand paper to clean the area before cutting the line with a tubing cutter. Someone stated trany presure of less than 3000psi, I'm not sure what the internal operating presure builds to, but as far as presure in the cooler lines I would guess that is around 10 to 20#. Non-reineforced rubber line is normaly used when adding an after market oil cooler. And the push lock fittings that have been talked about are made by Parker ind. They market the fittings under the push-lock name and to meet the presure holding specs. you need to use the proper hose. They are identified by the yellow ring and from past expierence, if you use a hose clamp to back them up and over tighen it, the flutes on the barb can cut and dammage the line.

steve

 

[Maniak]

The 300psi I stated was line pressure.. I was trying to say the cooler pressure had to be lower than 300psi..

~Mark