Rear Axle Breather

[Leo B]

Please help. I have cleaned the rear axle and noticed that it has a threaded hole. I'm pretty sure it should have a valve. What kind of valve and where to find one? I also found a smaller hole on the same side without the thread. What is its purpose? Moisture or...?

 

Edited December 9, 2022 by Leo B

[64studeavanti]

The threaded hole is used to mount the junction for the brake lines. The one lower down is the breather. I usually stick a small nail in the breather so it doesn't get covered when painted.

[regnalbob]

3 hours ago, 64studeavanti said:

The threaded hole is used to mount the junction for the brake lines. 

The spacer goes between the tee fitting and the axle.

[Leo B]

Thank you. Now I understand that the smaller one is the breather and the bigger one is for attachment. I found an article today where the larger one has been vented and the smaller one is closed. This prevents dirt and water from entering the axle and stern. Specially for 4X4 vehicles.

https://slickrock4x4.com/dana-44-vent-axle/
I think also (like writer of article), that small and open breather hole is not an good idea. It can easily become clogged with dirt. No wonder the idea was changed later.

[Avanti83]

5 hours ago, Leo B said:

Thank you. Now I understand that the smaller one is the breather and the bigger one is for attachment. I found an article today where the larger one has been vented and the smaller one is closed. This prevents dirt and water from entering the axle and stern. Specially for 4X4 vehicles.

https://slickrock4x4.com/dana-44-vent-axle/
I think also (like writer of article), that small and open breather hole is not an good idea. It can easily become clogged with dirt. No wonder the idea was changed later.

Generally in the older applications the small hole was covered by a spring clip that kept out dirt and held the brake line off the axle. adding the venting hose later would help with eliminate water intrusion.

[Leo B]

Thank you Avanti83. Actually I have the spring clip. It was not in the correct place and I didnt know this purpose. I will add also venting hose.
This was big help from you all👍😊

[Leo B]

17 hours ago, regnalbob said:

The spacer goes between the tee fitting and the axle.

Regnalbob, Do you know the thread size? Maybe 1/4 and 20 unc?

Edited December 10, 2022 by Leo B

[regnalbob]

On 12/10/2022 at 11:34 AM, Leo B said:

Regnalbob, Do you know the thread size? Maybe 1/4 and 20 unc?

1/4 fine thread, 1&1/8 inch long with 1/4 inch shoulder.

Spacer is 1/8th thick.