Hissing Sound TSB

[MMeilicke]

My 2008 developed a hissing sound coming from the power boost area. The sound disappears wheel applying the brakes or turning the steering wheel. There is supposed to be TSB addressing this issue saying that it is caused by the teflon tube in the hose moving into the power boast. Does anyone know where to find that TSB or the number?



Thanks

 

[KLauber]

Here ya go. Dont' know if your issue is TSB related might be individual warranty problem.

2008 TSB's


Ken

 

[Bob4x4]

There is no TSB,Not a safety issue just an a pain to listen to. It is Item# 3 in the dealer parts book once they get on the correct page.

 

[MMeilicke]

I have found the TSBs on the 2008 and can't find a TSB relative to the "hissing sound". My issue is that I took the truck in to a dealership to correct this problem and they replaced the power booster to a tune of $1,100. 4,000 miles later the sound returned and my home dealership said it was the teflon tube in the hose not the power booster and that the booster can't make that sound. They pulled the tube out and all is well. They also said that the reason for the tube in the first place was to assist in the manufacturing process and not for performance issues. Now I am looking for documentation from Dodge that will support this theory so I can go back to the first dealership proving an incorrect diagnoses.

I was under the impression that there was a TSB but I don't what year the TSB came out.
Any help in finding document to support the tube theory would be appreciated.

 

[MMeilicke]

I forget to mention in the above post, that the tube that was pulled out by my home dealership was only 10" long and showed a rough edge on one end that would support the theory that the first dealership tech very well may have cut off a portion of the tube and shoved the remainder back down the hose.

My theory is the first dealership replaced the power booster,and found that the hissing was still there, and eventually discovered that the problem was the teflon tube, cut the tube, shove the remainder length of the tube back down the hose, and hissing stopped. Does this make sense?

 

[Jim W]

It is not a teflon tube. The liner could be made out of a teflon type material but it is part of the hose.

What you are seeing is the liner of a high pressure hose assembly. Anything over 100 psi, could be consider high pressure in a hydraulic application. The way a high pressure hose is made, in most cases is there is a liner made of some compatable material. This material will not react with the medium (fluid/gas) that is being carried through this hose. The liner is laid flat and than wrapped around a mandrel with supporting material wrapped around it. An outer cover of some material again compatable with the surrounding fluids used in the area. This whole assembly is than cured to forum a hose.

The hose is than cut and fittings are pressed on the hose thus you now have a hose assembly.

Knives used to trim all of this material and cut off operation must be extremely sharp and sometimes when they become dull the material will be nicked. When this happens you will have an early hour hose failure such as a liner failure and or the fluid weeping through the cover, and or a burst of the hose.

This is what is happing to the liner in the Hydro booster application. The liner is failing do to improper manufacturing methods and than moving into the hydro-booster causing the hissing. The rough edges are from the failure and the high pressure oil deteriorating the liner as it is passed over the material.

Jim W.

P. S. sorry for the long explanation

 

[MMeilicke]

Thanks for the explanation as to what is going on, and no apology is needed for the long explanation. So, what would the proper fix be?

 

[Jim W]

I would replace the failed hose assembly with a new one from the dealer. I do not think NAPA carries this hose assembly.

I have never seen any information on a second failure of this hose assembly in this application as of yet.

Jim W.

 

[MMeilicke]

Does the new hose have the white tube or what I called the teflon tube inside the hose?

 

[Jim W]

Does the new hose have the white tube or what I called the teflon tube inside the hose?

I do not know. I have never failed this hose assembly on my truck, so I have not seen a replacement hose assembly. Like I said earlier this is a manufacturing defect, when making the hose assembly. I have read on this and other sites where owners have replaced this hose assembly after a failure and have not had this issue again.

Good luck.

Jim W.

 

[TDRadmin]

Jim W answered this very same question: Issue 73, page 40.



Thanks, Jim

 

[sag2]

Your documentation for the proper repair is in STAR case number S1119000007. Here is what it says.



Case Number: S1119000007

Release Date: 09/17/2011

Symptom/Vehicle Issue:

Power Steering Honk or Hiss May Be Heard During Brake Applications.

Diagnosis:

Customers may complain of a noise (honk - sometimes coupled with a hiss during brake applications) during low speed parking lot maneuvers. If you have this complaint, please perform the following:

Repair Procedure:

1. Inspect the steering column intermediate shaft boot is in position and not making noise from rubbing on the shaft. If there is a noise when turning the steering wheel, adjust the boot appropriately and verify the noise is no longer present.

2. If the noise is still present, perform a steering system bleed procedure outlined on TechCONNECT >Service Info>19-Steering>Pump>Standard Procedure>Power Steering System Bleeding and verify the noise is no longer present.

3. If the noise is still present, verify that the pressure hose (to hydro-boost) internal tuner (white plastic hose) has not become dislodged and positioned into the hydro-boost, to do this disconnect the pressure hose from the hydro-boost and see if white plastic tube is protruding from the pressure hose. If it has, replace the hose*, bleed the system of air and verify the noise is no longer present.

NOTE: WHEN RETURNING THE HOSE TO THE CHRYSLER WARRANTY CENTER, PLEASE RETURN THE ENTIRE HOSE INCLUDING THE WHITE PLASTIC TUNER ELEMENT THAT HAS BECOME DISLODGED.

4. If the noise is still present, replace the steering gear and bleed the system and verify the noise is no longer present.

If the gear change does not eliminate the noise, please contact the Star Center.