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Old 10-08-2020, 06:38 PM   #1
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1999 Signature 45 Air compression

Hello: looking at a 45 and I have a question about the air system. It has 10 bags and the 525 Cummins. When the engine is started the alarm sounds and continues to run until the pressure reaches 80 which takes about 2 and a half minutes. I owned an 03 Dynasty 40 that had a similar amount of bags and the 400 engine.....it reached 110 in less than 1 minute and alarm quit. Is this an indication that there may be a leak in one of the bags or elsewhere or is it normal for the 45/525 chassis/engine configuration? Thank you.
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Old 10-08-2020, 06:49 PM   #2
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If all 3 air tanks were empty, 2.5 min to fill to 80psi is a bit slow. Was the engine running at hi-idle speed?
There is soooo many places on the air system to leak besides the air bags!
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Old 10-08-2020, 09:29 PM   #3
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With a 20 year old coach air leaks can be common. We have owned ours for over a year now and have fixed the big ones. But still have many smaller ones to seek out and repair.

The easier test is to see how quickly the air pressure in the tanks drops after you shut the coach off. In a perfect world with no leaks, the pressure gauge shouldn’t move at all. If the gauge doesn’t move in a few weeks, I think that’s a pretty satisfactory result and our goal for a 20 year old coach. If it goes a few days that’s still not too bad, but it goes down in hours or minutes then I would be looking for some bigger air leaks. Our major leak was a pressure protection valve connected to the front tank, we coils actually hear the air leak it was so bad.

All the best with the air leaks! It certainly is an adventure.
Josh
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Old 10-08-2020, 10:05 PM   #4
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checking for air leaks and blocking your rig

Appreciate the forum and learning a lot . We have a 1998 Dynasty Executive and was wanting some advice or even pictures of how one should be blocking the suspension when working underneath it. Thanks in advance for any best practices so my wife does not have a pancake husband cheers
John
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Old 10-09-2020, 08:47 AM   #5
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Quote:
Originally Posted by JMCruiser View Post
Appreciate the forum and learning a lot . We have a 1998 Dynasty Executive and was wanting some advice or even pictures of how one should be blocking the suspension when working underneath it. Thanks in advance for any best practices so my wife does not have a pancake husband cheers
John
Hi John, that's a good point. It is important to take all the necessary precautions before crawling under your coach. Here is a link to the post on our build thread where I replaced the pressure protection valve: https://www.irv2.com/forums/f115/upg...ml#post5288851

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As you can see, we built ramps out of sturdy 2x12s and this allowed us the proper clearance to get under it. As far as blocking, or other methods, I'll leave that up to someone who has done it before.

Hope that's helpful. Stay safe,
Josh
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Old 10-09-2020, 05:53 PM   #6
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99 Signature 45

Thank you folks. Your comments are well-received. It sounds like this is to be expected for its age and the causes are many. I'm at an extreme disadvantage logistically as the coach is in AZ and I'm in MA, dealing with FaceTime vision limitations. One consolation is that the owner is a fellow IRV2 member and that elevates the trust factor. Any other thoughts that you might offer will be greatly appreciated. Thank you again.
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