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Old 02-01-2004, 02:42 PM   #15
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Quote:
Originally posted by Ed & Debbie
Will having my trailer tires balanced (high-speed) be a prudent action if that's all I do for now?
I actually had more vibration after the wheels/tires were balanced. Apparently the imbalance of at least one wheel/tire was offsetting some imbalance in the hub/drum.

That's when I concluded that InlandAndy was right (aplologies) about the need to balance the whole shooting match.

I'll report on the Centramatics when I have at least one substantial trip on them.
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Old 02-01-2004, 02:48 PM   #16
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John,
Please report back. There's always something new to learn! On our way home with the new Safari Friday the counter piece, 'false-front' covering the sink bottom, came loose. The trip was 140mi+. Is this an indication of imbalance as discussed?
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Old 02-01-2004, 02:50 PM   #17
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Ed & Debbie.

That's the message that failure sent you.

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Old 02-01-2004, 02:56 PM   #18
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What to do?

Andy,

John reports that tire balance alone did not help, actually made it worse. Should we do nothing until I can have the whole system balanced. I would have to find someone locally.
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Old 02-01-2004, 03:06 PM   #19
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Ed & Debbie.

John said (if I understood him correctly) that his vibration worsened after the "tires and wheels" were balanced.

He did not balance the hub and drums, along with the tires and wheels. Therefore, as he pointed out, the overall balance deteriorated.

The "complete" assmbly must be balanced as an assembly, just as we show on our web site.

Balancing only the tire and wheel, "can" ( as in John's case) make the situation worse.

As we have stated many times before, the "tire, wheel, hub and drum assembly" must be balanced, as an assembly. Anything short of that is a compromise.

We stongly feel that the complete balance is the "ultimate." No one yet, has come up with a better answer.

Andy
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Old 02-01-2004, 03:23 PM   #20
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Ed/Debbie/Andy,

Don't the new coaches already come fully balanced? If not besides lugging the coach to Inland from Chicago, what are my options (besides the "local" Airstream dealer?

Eric
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Old 02-01-2004, 03:33 PM   #21
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Centramatic

It seems to me that the Centramatic (not an endorsement) would balance the complete assembly. Really looking forward to hearing user reports.
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Old 02-01-2004, 03:35 PM   #22
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lathe?

ed/debbie/andy and now eric,

about a year ago on a similar thread i wondered if one could have drums/hubs balanced by a machinist on a lathe. by drilling or welding on tabs. not unlike my harley flywheels.

(i have access to such services but not the snap on rig)

then one could have the wheel assemblys balanced in a conventional manner.

waddya guys think?

john
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Old 02-01-2004, 03:45 PM   #23
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Re: lathe?

Quote:
Originally posted by john hd
ed/debbie/andy and now eric,

waddya guys think?

john
John,
This is all news to me. I figured high-speed wheel balance was sufficient. I'm just along for the ride looking for more info before I reach any conclusion and action.
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Old 02-01-2004, 03:57 PM   #24
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Lathe?

John HD:
I took my new drums to a machine shop I do lots of business with. He gave up. You need to go to a balance shop like a driveshaft/clutch/flywheel specialist.
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Old 02-01-2004, 03:58 PM   #25
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balance

John, before you put on the balancers is there a way too measure the impact before/after? Place something in the trailer to see the impact without (marbles in jello..etc) and then do the same after you've installed the Centramatics. I'm interested in whether they work. If I new of someone around Dallas Ft Worth that balanced the entire assembly then I'd have it done. Just don't know where to go. The Centramatics may be a next best option.
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Old 02-01-2004, 04:02 PM   #26
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1) I really think Andy is quite correct in what he says.

2) Unfortunately, Airstream has not balanced their hub/tire assemblies for a great many years. They say don't worry about it.

3) The problem is directly proportional to length - the longer the coach, the more a given vibration translates into longer and longer oscillations at the back.

4) There are very few places that have the equipment to do this properly. Inland RV may well be the only Airstream dealer who still has the balancing equipment. There are said to be truck alignment shops here and there that can do it, but try and find one!

5) Since the demise of the rear bath and the reinforced frames, it does not seem to be near the problem it once was. Is this because these units are not yet 30 years old? Possibly. We'll see I suppose.

6) I have an '85 25' center bath coach, have never found anyone who can do the proper hub/wheel/tire balacing, and don't plan to lose any sleep over it.

Mark
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Old 02-01-2004, 04:24 PM   #27
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Re: balance

Quote:
Originally posted by Tin Hut
John, before you put on the balancers is there a way too measure the impact before/after? Place something in the trailer to see the impact without (marbles in jello..etc) and then do the same after you've installed the Centramatics.
I can't think of a test without having something like a recording accellerometer. Folks with motorhomes report that things stop buzzing when the balancers are put on; I guess that if things in the trailer stop unscrewing themselves, I'll consider the money well spent.
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Old 02-01-2004, 04:29 PM   #28
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There are units coming out with disc brakes does that mean the balancing issue goes away because there is no drum?
The most significant issue with the chassis was when the gray tank was added to the trailer , this added extra weight to rear of the trailer that caused more flexing to the frame. This flexing led to chassis fatigue and rear end seperation.
Since then more attention has been given to floor plans and tank locations.
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