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Old 05-30-2014, 04:16 PM   #1
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Air in Airbags w/o Starting Engine

Gonna be leaving in a couple of weeks. Starting to put things in the coach. The coach isn't sitting quite level and the airbags have settled just enough so that the step is dragging.
Not ready to move the coach so is there a way to put air in the airbags w/o starting the engine for maybe 2-3 min?
If I have to start it just to full the bags, so be it but not ready to drive it around yet.

TIA

dave
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Old 05-30-2014, 04:29 PM   #2
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On our American Coach's, I have just hooked a line from shop compressor to the fitting where is used to tow or inflate tires. Be aware not to exceed the normal PSI of the motorhome! My shop compressor was set at 150 so I had to be careful.
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Old 05-30-2014, 04:33 PM   #3
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If you have access to an air compressor, and you have made up the right connector for the air system, you can connect the compressor to the towing air connector at the front of the coach. There will be one as it is required when a tow truck is hooked up.

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Old 05-30-2014, 08:06 PM   #4
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Thanks for info guys.
Found the front air connector.
Think I will use this.
thanks again
dave
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Old 05-31-2014, 07:50 AM   #5
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I know I will have to put my flame suit on but you will do no damage to your engine by letting it idle for a few minutes while it airs up. The advice to not turn that key unless you are going to run it at highway speed 25 miles every time is way over the top. Occaional start-ups with short run/idle times will not cause harm, I have done it for years on tractors, heavy equipment and my MH and have never had to go into an engine for repairs.

Ask your dealer if they take diesels for a highway run everytime they move a MH around the lot.
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Old 05-31-2014, 08:51 AM   #6
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The aux air compressor works for me. Makes some noise, but not bad since it is tucked inside a front bay. Brings the bus up on air in about 2-3 minutes. The way I have it plumbed, all air tanks are nicely filled and ready to go when it is time to start the engine. If we are boondocking, the same method would require the genset to be started to supply 120v AC. Sort of defeats the intent of making a quiet early morning departure though. We do have a 12v air compressor plumbed into the same system, but that thing is a wimpy toy compared to the husky Makita 120v compressor.
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Old 05-31-2014, 10:02 AM   #7
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Better to start engine and let it run for 5 minutes than to be ready to leave, turn key and nothing happens. Jim
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Old 05-31-2014, 11:20 AM   #8
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Well after thinking about this, I went and started it to raise the bags.
One more start of many.
thanks for all the replies

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Old 05-31-2014, 06:34 PM   #9
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If you want it to last 400K NEVER do what you just did. My practical side says do what's necessary and move on. Not saying I would do it every day or even once a month but I don't want to overthink it either.
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Old 06-01-2014, 07:40 AM   #10
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All things being done properly as regards to total maintenance that engine can easily last 400K with and occasional quick start and stop, it's a heavy duty diesel engine, not a toy.
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Old 06-01-2014, 09:17 AM   #11
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If I need to start the engine for any reason or any amount of time, I just do it. This isn't some Briggs and Stratton engine, it's a HD diesel. Sometimes we overthink issues and forget what we have. In 50 years of owning hundreds of HD diesel powered trucks. tractors, and heavy equipment, I can not recall any problem attributed to momentary starts and stops. That's not to say I would go out and do several starts a day, but whenever necessary, just do it and forget it.
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Old 06-01-2014, 10:44 AM   #12
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Start you engine for the short period of time needed. The air supplied by the engine air compressor is filtered and most of the moisture is removed BEFORE it enters your air system, air from a auxiliary air compressor does not remove moisture and injects into your air system. Moisture in your air lines is NOT your friend... If your coach continually looses air, address that issue and have the leak(s) corrected, but unless it was an emergency, I would not inject untreated air into my air lines...
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Old 06-01-2014, 12:33 PM   #13
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Quote:
Originally Posted by motorhomeguy View Post
Start you engine for the short period of time needed. The air supplied by the engine air compressor is filtered and most of the moisture is removed BEFORE it enters your air system, air from a auxiliary air compressor does not remove moisture and injects into your air system. Moisture in your air lines is NOT your friend... If your coach continually looses air, address that issue and have the leak(s) corrected, but unless it was an emergency, I would not inject untreated air into my air lines...
This is the reason I started it. I could have use my shop compressor that has an air dryer but by the time I drug enough hose out to the coach it wasn't worth my time.

thanks

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