Almost lost a wheel - Page 4 - Fiberglass RV


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Old 08-04-2015, 08:14 AM   #43
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Nice explanation, Redbaron, thanks. This mechanical engineer was taught many years ago that all bolted connections rely on the elasticity of the components involved. Sometimes the elasticity in increased by making the bolts longer, e.g. the connecting rods. Some instructions may say: tighten to the point of solid contact, then some fraction of a turn, unless a torque value is given.
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Old 08-04-2015, 12:07 PM   #44
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Well, to make this story a bit more complex, I had to grind about a 1/8" around the centre hole to make the ranger rims fit.
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Old 08-04-2015, 12:13 PM   #45
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Any time the clamping pressure in insufficient to keep parts from moving in relation to each other the result will eventually be fatigue fracture of the bolts.
If the hole in the center located the wheel and the bolts did not have a locating cone then this could have been the problem.


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Old 08-04-2015, 12:18 PM   #46
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The bolts used, and the bolt holes in the rim were both conical. I have been using Ranger rims from Calgary to Northern Ontario, (and back, eventually). When they are torqued sufficiently, I have had no problem. I do check the torque fairly regularly now.
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Old 08-04-2015, 01:19 PM   #47
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I have found what JD described to be true. Factory steel wheels have built in resiliency that make them much more resistant to loosening. Wheels that have thicker centers, whether they be cast aluminum or steel plate require re-torquing after driving 50-100 miles, and frequently rechecked periodically. For those wheels the lug studs are stretched during torquing and provide some resistance to loosening. I think the reason they loosen at first is the lug nuts tend to need to bed into the tapered holes a bit. After a while they hold pretty well. Powder coated wheels will need re-torquing a few times at first to bed in.
Hub centric wheels are desirable due to the added shear provided by the hub. However many wheels that are sold are non-hubcentric. There are companies that can machine hub centric adaptors which will work in some cases.
Russ
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