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Old 02-21-2012, 06:22 AM   #21
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1979Sunline is an unknown quantity at this point
it has a 19 foot living area and 22 foot from bumper to hitch, so im assuming its the 19 and a half model. the p/o inflated it up to 50 psi before i left, all four, we had to go get a bigger drop draw bar also, it sits about one inch high in the front with the 8 inch drop, my truck is to friggin tall, but it was darn close to level. stock rims....roof is solid, there is new rafters and ply wood. trailer was unloaded, completely empty. valve stem crossed my mind as i did not hear a pop or a sudden jerk of the trailer if the tire really blew out, the valve stem was found CLEANLY CUT in between the hub cap and the rim, it was cut right where it mounts to the wheel, which makes me think it slowly lost air then just killed the tire, the tread was like new when i left, and now there is nothing left of the tire, nothing but a couple inches of sidewall, the tire is GONE. i didnt even know i blew a tire until i heard the leaf spring dragging on the road, no bang, no shake, no jerk, when i stopped i was riding on the outer edge of the rim!
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Old 02-21-2012, 07:07 AM   #22
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If the valve stem was cleanly cut I would gather that this was the cause. Perhaps the valve stems weren't replaced when the tires were replaced.

Like John said, if the axle was bent or misaligned it would feather wear the tires and cause rapid wear, but not cause this type of failure in such short order.

Valve stem are like tires in how they age. They will deteriorate and crack in the mounting flange area like yours failed.

Just my $.02 worth!
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Old 02-21-2012, 10:22 AM   #23
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brand new stems.....but i know what you mean
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Old 02-21-2012, 03:57 PM   #24
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With 380 miles on a tire it's not going to show much ware even if the alignment is miles off but it sure will get hot.
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Old 02-21-2012, 04:01 PM   #25
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next time i tow it, it will be heading to its permanent location, i will stop and check rim temps every 30 to 40 miles and see whats up....i will also inspect the axle when i swap out the rims
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Old 02-21-2012, 05:58 PM   #26
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If you have solid rafters and plywood, then the camper will be heavier then original. But if the camper was empty other wise, well the weights should of been in line and not an overload.

A 1" high nose on the TT will put more weight on the rear axle but 1" should not be orders of magnitude. Which location blew? Front or rear?

Re-reading this:
Quote:
i thought the same thing, i will check with a straight edge, previous owner was very meticulous he measured every possible measurement, camber caster, front to back, side to side, when his tire blew out and everything was A ok. ill check it again when i replace the tire.....only think i can think of is excessive brake heat, we came down from mass over rt 2 through the berkshires in some REALLY steep terrain and mountain roads, once we crossed into NEW YORK we then descended down another decent sized hill and the tire went at the base of that hill? the blow out is on the axle that has the brakes, and on the right side, the roads i was on were very bumpy and the crown was steep in spots putting a lot of stress on this particular tire.
H'mm, do you mean that only 1 axle has brakes? Are there not wires running to both axles and all 4 wheels have brakes? I know you have a 79 but still I have never heard of a dual axle trailer that had brakes only have 1 axle.

Before I type a bunch on that, let us know if both axles have brakes or just one.

Thanks

John
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Old 02-21-2012, 06:07 PM   #27
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right rear axle blew, and i only saw wires on the rear, but ill look in the daylight
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Old 02-21-2012, 07:14 PM   #28
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Quote:
Originally Posted by JohnB View Post
H'mm, do you mean that only 1 axle has brakes? Are there not wires running to both axles and all 4 wheels have brakes? I know you have a 79 but still I have never heard of a dual axle trailer that had brakes only have 1 axle.

John.

The 1978 17 1/2SB we had, only had brakes on the rear axle...
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Old 02-21-2012, 07:52 PM   #29
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Quote:
Originally Posted by EMD_Driver View Post
John.

The 1978 17 1/2SB we had, only had brakes on the rear axle...
That is strange. I wonder how that did that. While they can make a 5,200# (6,000#) brake on 12" drums (like I have in the T310SR) Odds are high there they where only 10" drums on the 17 1/2 SB. One of those drums set would only be about 3,600# of stopping.

OK out of a really strange chance, anyone know what drum size they used?

If that is actually a 3,600# brake setup then that one brake would generate a lot more heat then the brakes we use where all 4 wheels have brakes.

If 1979Sunline was doing a lot of braking on only 1 axle that drum would really get hot. But so would the other drum brake as well and it did not blow. Did that possible heat aggravate a marginal valve stem to start leaking? Good question.

Only 1 axle set of brakes on a dual axle setup. Learn something new every day....
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Old 02-21-2012, 08:02 PM   #30
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the stems were nearly new, and look new also, but the almost total clean cut has me thinking, and not hearing the actual tire explode also gets me thinking, it was like a gradual transition from 2 tires to 1 tire and the rim/leaf dragging, i dont know how a blow out usually is, this is my first, but no noise, no jerking, no nothing, until i started dragging steel, i found that kind of odd
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Old 02-21-2012, 08:13 PM   #31
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While I have dealt with a number of flat tires, I have never had one blow out at highway speeds, yet. So I can't comment on one blowing out on a TT. We have had many here on the forum have them though.

Valve stems leaks. Many occur at the seal to the rim where the stem snaps in. A rusted rim or just one that never seated in right from day one can be problematic.

You are going to have to go into cautious and invesgation mode when you put the new wheels on.

For sure post back anything you find out. This is a good learning one for all of us.

Thanks

John
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Old 02-22-2012, 09:27 PM   #32
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I found an interesting thread on RV.net (Woodalls flavor) about several million Chinese stems being defective. There is a picture if the stem with a clean cut at the rim. Here is the thread:
Woodalls Open Roads Forum: Tech Issues: More on Tire Valves...

There is also a link there to a story about the valve stems.
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Old 02-23-2012, 05:28 PM   #33
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good info, thank you, ill check the other three when i replace the tires
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Old 04-26-2012, 10:29 PM   #34
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well it appeared that the stems on the rims carried the 413 number which means they could have been part of the recall.....

anyway, i swapped out the old steelies for new 13" white spoked rims with chrome center caps. i swapped in 4 new stems, the three tires that were on the other wheels (2 years old and in great shape) and one new tire to replace the one i blew up. i then drove her about 90 miles up to camp, pretty much the same distance i went bringing her home, i had no issues, no blow outs etc, so maybe i fixed the problem, maybe i didnt, but i sure updated the look of the camper and now she will sit on a seasonal site for as long as i can foot the bill lol.
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Old 04-26-2012, 10:36 PM   #35
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oh yes i forgot to mention, one other stem was getting ready to crack off where mounted to the rim, and another was just starting to crack....these were new last year....
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