Air Suspension

[Norman Roach]

FYI, Air leaks all fittings. The problem is O rings on all the fittings are SAE, they need to be replaced with Metric O rings. The problem is the O ring on the outside of the fittings. There are 17 of them. The O ring inside the fitting is OK. Each fitting has two small O rings where the tube goes into the fitting, they should be OK. Use a dental pick to pull out the external O ring on the fitting, use a metric one which is a little thicker, use white grease on the fitting, coat the new O ring and push it onto the fitting. DO NOT USE SEALANT. To install push hard with your hand to keep the fitting straight while tightening with 12 mm metric wrench, check it to see if it started be careful NOT to cross thread it, tighten to bottom it down. You will never see bubbles on these fittings with soap and water, the leak is too small. Try to tighten each fitting before you start, the fitting should be bottomed out, Mine were not tight. That will fix your problem.

 

[DanAR]

It would probably be helpful if you could post the size and thickness of the o-rings.

 

[Norman Roach]

It would probably be helpful if you could post the size and thickness of the o-rings.

The SAE rings on the fittings are o dia .432, i dia .320 and thickness .062 measured, it is a R-04. They are a loose fit. The METRIC ones are o dia .442, i dia .320 and thickness is .070 measured, it is a R-06. I still have a small leak on the right front, I suspect the 90 elbow to the line. I am currently trying to find the best one to replace it. My truck is 11 years old, the best truck I have ever had.

 

[DanAR]

Thanks