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Old 04-27-2011, 04:37 AM   #1
CBTraveler
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Underbelly covering problem

A section of the plastic sheet material that covers the underbelly of our 2006 3400RL detached recently. The self tapping screws that hold the material to the frame broke through the plastic material and allowed the sheet to hang down and almost drag on the ground. I'm not sure why or how it happened, but I refastened it. The holding surface area of the self tapping screw is pretty small and I can see that it might be easy for the plastic to fracture. I added 1-1/2 inch fender washers to each screw before I re-attached the material.The passenger side material was busted enough that the screws and fender washers did not make contact with the material so I used a 1-1/2 inch 4 foot angle iron brace along the length of the frame rail to provide adequate gripping surface. All of this was done in 28 degree wet weather just before we were starting on a trip, so when we get back to a nice clean surface and warmer weather I'll put fender washers on all of the fastening screws to be safe.
 
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Old 04-27-2011, 05:05 AM   #2
nailbender
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Our Montana has fender washers on all the self tapping screws holding the underbelly up except for the front dropped rail section that has a strip of aluminum on each side that the screws go through. Sounds like somebody on the assembly line forgot to use fender washers.
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Old 04-27-2011, 05:54 AM   #3
Art-n-Marge
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nailbender, that must be a newer manufacturing process. My Monty and other Keystones from '06 that I've crawled under do not have fender washers. They use hex/washer heads but the washer part isn't much larger than the head. The worse problem I have is that the screws fall out. Fortunately, this happens at home when the trailer sits on the driveway.

I guess you've given me another project, but I'm gonna have to find a way to make sure these stay in better, too?
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Old 04-27-2011, 06:48 AM   #4
HamRad
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We have an '02 model and the underbelly covering did not come with the fender washers. But we have, however, been adding them as we have worked on it. So now we have about 1/2 of the screws with fender washers on them. They make for a much more secure underbelly. I don't know if Keystone ever installed them on a routine basis. Good luck. Dennis
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Old 04-27-2011, 10:33 AM   #5
Trailer Trash 2
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no fender washers on my 04 either ,there is now everytime i go under I'll remove the screws and put a fender washer on.
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Old 04-27-2011, 11:02 AM   #6
kdeiss
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No Fender Washers on our 02 and no problems
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Old 04-27-2011, 01:07 PM   #7
Weldon
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I have a 2010 & have Fender Washers.
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