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post #1 of (permalink) Old 05-23-2009, 07:04 PM Thread Starter
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fiberglass tub help

i got a fiberglass tub install kit from 4 wheel drive hardware.

it came with 3/8in carriage bolts (flat round head and a square underneath, i think thats a carriage bolt)

i drilled the mounting holes to 3/8in and can't tighten the nut because the carriage bolt just spins.

am i supposed to countersink it so the square fits into the fiberglass and doesnt spin? i'd rather use a normal hex head bolt.

any tips? and is there a recommended torque spec for fiberglass body mounts?

thanks

dave
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post #2 of (permalink) Old 05-23-2009, 07:50 PM
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The square should pull into the fiberglass and not turn, but if you drill too large a hole it won't get enough grip. When putting them in wood you drill a hole the size of the shank, put the bolt in the hole and whack it with a hammer. Probably need to do something like that in fiberglass, but you might have to make the hole a little larger than the shank; I don't know. The install kit should have had instructions. You might want to call the vendor and ask about that and the torque spec. Next Tuesday.

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post #3 of (permalink) Old 05-23-2009, 10:25 PM Thread Starter
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thanks. i've been gripping them with vice grips and just snugging them down.

i've already called about the instructions. apparently there are none.

im just mocking everything up now before paint, ill get the torque specs for the final assembly.
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post #4 of (permalink) Old 05-24-2009, 07:05 AM Thread Starter
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what did you all do with these braces coming off the gas tank crossmember when installing the fiberglass tubs.

HPIM1581.jpg picture by robertsda08 - Photobucket

these braces seem like they aren't really all that necessary.
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post #5 of (permalink) Old 05-24-2009, 09:28 AM
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Quote:

these braces seem like they aren't really all that necessary.
I'd say, those braces would reduce the fore and aft shear stresses on the body mounts.

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post #6 of (permalink) Old 05-24-2009, 10:04 AM
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what did you all do with these braces coming off the gas tank crossmember when installing the fiberglass tubs.

HPIM1581.jpg picture by robertsda08 - Photobucket

these braces seem like they aren't really all that necessary.


When I swapped to a glass tub about 8 years ago I deleted those from the installation and have not noticed any ill effects.
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post #7 of (permalink) Old 05-24-2009, 02:16 PM Thread Starter
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i didnt use them. i tried but 4wd.com recommend #2 and #3 mounts be cut to 2 inches to set the height of the tub. i think this is higher than the stock tub so the geometry for these braces was off.

thanks for the tips.
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post #8 of (permalink) Old 05-24-2009, 04:31 PM
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You may not need them, but, at least two people smarter than me say you do, one was an AMC engineer, the other was an AMC administrator/ "bean counter".

Maybe a fiberglass body does not need them. But fiberglass is thicker than metal. So, a longer lever means more torque.

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post #9 of (permalink) Old 05-24-2009, 06:24 PM
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Quote:
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You may not need them, but, at least two people smarter than me say you do, one was an AMC engineer, the other was an AMC administrator/ "bean counter".

Maybe a fiberglass body does not need them. But fiberglass is thicker than metal. So, a longer lever means more torque.

That's all well and good but these two smart fellas say these are needed WHY? That's the useful information.
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post #10 of (permalink) Old 05-24-2009, 07:11 PM
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That's all well and good but these two smart fellas say these are needed WHY? That's the useful information.
Anyone can build a vehicle... an engineer can build it the lightest with less materials... so if it is there, it must be needed.

The bean counter looks for anyway to eliminate cost so an engineer must have convinced him it was needed.

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