Proper Torque for Fuel Fittings

[Steve Waltner]

I'm to the point of installing the fuel fittings on the fuel tanks on
my RV-8A project. I'm a little confused about what torque to set my
wrench at when installing the fitting.

The fitting that goes through the tank rib and 3/16" reinforcement
plate is an AN833-6D elbow with an AN924-6D nut on the outside. There
are also a pair of -4D fittings for the vent line which will soon be
mounted as well. The only torque chart that I'm ever able to find is
one for AN bolts/nuts. Since these are aluminum fittings, I don't dare
torque them to the same values.

Any assistance would be greatly appreciated.

Steve

[Juan Jimenez]

I was taught to use no more than 10-12 ft/lb of torque for AN aluminum
fittings, but why not call Van's to get the answer from the source?

"Steve Waltner" > wrote in message
...
> I'm to the point of installing the fuel fittings on the fuel tanks on
> my RV-8A project. I'm a little confused about what torque to set my
> wrench at when installing the fitting.
>
> The fitting that goes through the tank rib and 3/16" reinforcement
> plate is an AN833-6D elbow with an AN924-6D nut on the outside. There
> are also a pair of -4D fittings for the vent line which will soon be
> mounted as well. The only torque chart that I'm ever able to find is
> one for AN bolts/nuts. Since these are aluminum fittings, I don't dare
> torque them to the same values.
>
> Any assistance would be greatly appreciated.
>
> Steve

[Morgans]

"Steve Waltner" > wrote

The only torque chart that I'm ever able to find is
> one for AN bolts/nuts. Since these are aluminum fittings, I don't dare
> torque them to the same values.
>
> Any assistance would be greatly appreciated.
>
> Steve

This is such basic information, I don't know why anyone needs to ask stuff
like this.

Everyone knows, you tighten it until it strips, then back off 1/4 turn.

I'll go back to my room, now. <g> Sorry, I had to do it!
--
Jim in NC

[Blueskies]

"Steve Waltner" > wrote in message ...
> I'm to the point of installing the fuel fittings on the fuel tanks on
> my RV-8A project. I'm a little confused about what torque to set my
> wrench at when installing the fitting.
>
> The fitting that goes through the tank rib and 3/16" reinforcement
> plate is an AN833-6D elbow with an AN924-6D nut on the outside. There
> are also a pair of -4D fittings for the vent line which will soon be
> mounted as well. The only torque chart that I'm ever able to find is
> one for AN bolts/nuts. Since these are aluminum fittings, I don't dare
> torque them to the same values.
>
> Any assistance would be greatly appreciated.
>
> Steve


Look up MS21344, should get you there...

[Blueskies]

"Blueskies" > wrote in message m...
>
> "Steve Waltner" > wrote in message ...
>> I'm to the point of installing the fuel fittings on the fuel tanks on
>> my RV-8A project. I'm a little confused about what torque to set my
>> wrench at when installing the fitting.
>>
>> The fitting that goes through the tank rib and 3/16" reinforcement
>> plate is an AN833-6D elbow with an AN924-6D nut on the outside. There
>> are also a pair of -4D fittings for the vent line which will soon be
>> mounted as well. The only torque chart that I'm ever able to find is
>> one for AN bolts/nuts. Since these are aluminum fittings, I don't dare
>> torque them to the same values.
>>
>> Any assistance would be greatly appreciated.
>>
>> Steve
>
>
> Look up MS21344, should get you there...
>
>


http://assist.daps.dla.mil/quicksearch/

[[email protected]]

Steve: I've got the torque charts at work and will pass on the correct
numbers when I get in. The torque values are different for the various
size fittings, with type of service and fitting material both having an
impact on the value.

Craig C.

[[email protected]]

Managed to locate the set that I had at home.

#6 Bulkhead nut is 75 inch-pounds +/- 5% for clean and dry threads.

#4D nuts get 75 inch-pounds +/- 5% also

Craig C.

[John]

Juan Jimenez wrote:

> I was taught to use no more than 10-12 ft/lb of torque for AN aluminum
> fittings, but why not call Van's to get the answer from the source?
>
> "Steve Waltner" > wrote in message
> ...
>> I'm to the point of installing the fuel fittings on the fuel tanks on
>> my RV-8A project. I'm a little confused about what torque to set my
>> wrench at when installing the fitting.
>>
>> The fitting that goes through the tank rib and 3/16" reinforcement
>> plate is an AN833-6D elbow with an AN924-6D nut on the outside. There
>> are also a pair of -4D fittings for the vent line which will soon be
>> mounted as well. The only torque chart that I'm ever able to find is
>> one for AN bolts/nuts. Since these are aluminum fittings, I don't dare
>> torque them to the same values.
>>
>> Any assistance would be greatly appreciated.
>>
>> Steve


That's a lot of difference between 75 in pounds and 120-144 inch pounds
(10-12 ft/pounds). Definetly check with Van's but if you can't wait go with
the more conservative. (i'd wait!)
John

[Juan Jimenez]

"John" > wrote in message
...
> Juan Jimenez wrote:
>
>> I was taught to use no more than 10-12 ft/lb of torque for AN aluminum
>> fittings, but why not call Van's to get the answer from the source?
>>
>> "Steve Waltner" > wrote in message
>> ...
>>> I'm to the point of installing the fuel fittings on the fuel tanks on
>>> my RV-8A project. I'm a little confused about what torque to set my
>>> wrench at when installing the fitting.
>>>
>>> The fitting that goes through the tank rib and 3/16" reinforcement
>>> plate is an AN833-6D elbow with an AN924-6D nut on the outside. There
>>> are also a pair of -4D fittings for the vent line which will soon be
>>> mounted as well. The only torque chart that I'm ever able to find is
>>> one for AN bolts/nuts. Since these are aluminum fittings, I don't dare
>>> torque them to the same values.
>>>
>>> Any assistance would be greatly appreciated.
>>>
>>> Steve
>
>
> That's a lot of difference between 75 in pounds and 120-144 inch pounds
> (10-12 ft/pounds). Definetly check with Van's but if you can't wait go
> with
> the more conservative. (i'd wait!)
> John

Yes, it is, which is one reason I told him to call Van's and ask and get it
from the source.

[Blueskies]

"Blueskies" > wrote in message . com...
>
> "Blueskies" > wrote in message m...
>>
>> "Steve Waltner" > wrote in message ...
>>> I'm to the point of installing the fuel fittings on the fuel tanks on
>>> my RV-8A project. I'm a little confused about what torque to set my
>>> wrench at when installing the fitting.
>>>
>>> The fitting that goes through the tank rib and 3/16" reinforcement
>>> plate is an AN833-6D elbow with an AN924-6D nut on the outside. There
>>> are also a pair of -4D fittings for the vent line which will soon be
>>> mounted as well. The only torque chart that I'm ever able to find is
>>> one for AN bolts/nuts. Since these are aluminum fittings, I don't dare
>>> torque them to the same values.
>>>
>>> Any assistance would be greatly appreciated.
>>>
>>> Steve
>>
>>
>> Look up MS21344, should get you there...
>>
>>
>
>
> http://assist.daps.dla.mil/quicksearch/
>

http://assist.daps.dla.mil/eAccess/loguser.cfm?ident_number=40046&dmxid=48839&passedUrl=http://assist.daps.dla.mil/docimages/0000/48/83/40046.PD9

See if that works...

[Steve Waltner]

In article >, Steve Waltner
> wrote:
> I'm to the point of installing the fuel fittings on the fuel tanks on
> my RV-8A project. I'm a little confused about what torque to set my
> wrench at when installing the fitting.
>
> The fitting that goes through the tank rib and 3/16" reinforcement
> plate is an AN833-6D elbow with an AN924-6D nut on the outside. There
> are also a pair of -4D fittings for the vent line which will soon be
> mounted as well. The only torque chart that I'm ever able to find is
> one for AN bolts/nuts. Since these are aluminum fittings, I don't dare
> torque them to the same values.
>
> Any assistance would be greatly appreciated.
>
> Steve

Thanks for the responses. I ended up and called Van's yesterday. The
response was that there is no official torque value for the nut that
attaches the fitting to the rib. The sealant apparently provides a fair
amount of the support on holding the fitting in place instead of the
nut. This confirms what I was told by some others that I had asked this
same question which was, tighten it down to where the nut bottoms out
and go on to the next task. I sealed the various fitings onto the
inboard ribs last night.

Steve