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Old 11-29-2012, 12:32 PM   #15
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If you have gotten good service out of the tranny fluid, no reason to change imo. Folks who were going to exotic fluid (like me) were in search of braking improvement, and if there was any I'm pretty sure I couldn't measure it.
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Old 12-04-2012, 11:21 PM   #16
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Thanks for the input EngineerMike, I will just stay with the Dexron III replacement fluid for my hydraulic system.

On another related topic... I just learned something interesting when I was performing a leak-down test on my new Dura-Lite CAC. The silicone rubber connectors with the OEM hose clamps don't pass the leak-down test.

This will take some explanation: I built my own CAC leak tester.


This uses the 4" x 6" connectors and clamps that are used in my Alpine Coach. I added a 4" hard maple plug in one end and used a 4" mufler clamp to create the tester as shown. I first tested my tester by putting the wood plugs back to back into 1 connector, and it leaked no matter how tight or loose I made the clamp. So I put some 3" "O" ring seals around the wood plugs and put the plug into the connector and positioned the clamp over the the "O" ring. That fixed the problem. Next I connected the other end of each connector to the CAC input and outputs. I brought the pressure up to 30 psi and started to hear air leaking at about 12 psi. But, the air was leaking from the hose connections and not the CAC itself. I was using some of the connectors and clamps that I took off my coach, so I decided to repeat the test with barnd new connectors and clamps. This configuration leaked even worse. In 15 seconds the pressure was down to 20 psi. I tried repositioning the clamps and tried different tesnions on the clamps, but they continued to leak. At this point I was frustrated, so I added "O" ring seals under the connectors on the CAC connections. The leaks stopped! In fact, my new Dura-Lite CAC was still at 30 PSI over an hour after I started the test.

At this point I have no faith in the connectors and hose clamps. Just 2 connectors failed the CAC leak-down test. The coach has 4 of these connectors on the compressor side of the turbo. I'm sure they will all leak just as bad.

I'm beginning to think that the leak-down goal (less than 7 psi leak-down from 30 psi in 15 sec.), is unrelistic. My guess is that the turbo produces enough CFM at 30 psi boost that the connector leaks are insignificant. The amount of air that escapes from the connectors in my test is pretty small. That is because the air capacity of the CAC is relatively small. It doesn't take much of a leak to loose 7 psi in 15 seconds.

I don't plan on adding "O" rings under all the connectors when I install the new CAC in my coach. Does anyone else have any experience or data related to this? Does anyone know of connectors or clamps that don't leak? (I am using FLX7715-0002 connectors and Breeze 406 spring loaded clamps.)
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Old 12-05-2012, 09:15 AM   #17
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I just replaced the end gasket in the cac on my coach and tested it after at 30 psi and had no problems with the old clamps or hoses leaking. Maybe just lucky?
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Old 12-05-2012, 03:18 PM   #18
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Quote:
Originally Posted by MKelley View Post
I just replaced the end gasket in the cac on my coach and tested it after at 30 psi and had no problems with the old clamps or hoses leaking. Maybe just lucky?
Thanks for this information, maybe there is hope for me yet. Can you tell me what hoses and clamps you are using (brand, part numbers or any other detailed information would be helpful).

Thanks, Dave Morgan
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Old 12-06-2012, 07:52 AM   #19
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They look the same as what you have pictured. Maybe being 8 years newer helps?
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