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04-15-2019, 11:15 AM
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#1
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Montana Fan
Join Date: Oct 2017
Location: Tyler
Posts: 186
M.O.C. #20704
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Tearing in to the underbelly
Dear Forum:
What are the best ways to tear into the underbelly and then patch it up after repairs? Are there specific tapes, glues or techniques anyone could recommend? No issue right now, but looking for advice if it becomes necessary (now that my warranty is out).
Thanks,
Max
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Maxwell and Beverly Dow
2018 3730FL 2020 Ram 3500 Dually SWB
"Prairie Schooner"
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04-15-2019, 12:06 PM
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#2
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Montana Master
Join Date: Mar 2019
Location: Milwaukie, OR
Posts: 1,455
M.O.C. #23668
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I've used wide Gorilla Tape. Works great
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Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana HC 305RL / HW Progressive EMS
2015 RAM 3500 Laramie Longhorn Crew Cab 4x4 DRW / Demco Recon Hitch on RAM Puck Ball
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04-15-2019, 12:33 PM
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#3
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Montana Master
Join Date: Jan 2016
Location: STAYTON
Posts: 1,118
M.O.C. #18157
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Just take the fasteners out and drop it down. They come out fairly easily. Then replace with stainless screws and washers or I have re-used some of their fasteners.
Mark
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“Hard times create strong men, strong men create good times, good times create weak men, and weak men create hard times.”
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04-15-2019, 12:49 PM
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#4
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Montana Master
Join Date: Oct 2017
Location: Trinidad, TX
Posts: 506
M.O.C. #20746
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Pop out the rivets to take the coroplast off and use 3/8" screws with a thin wide washer to put the coroplast back in place. That's what I do.
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2018 Ram 3500 Laramie Longhorn 4X4 Dually Cummins Aisin CC LB / B&W Companion hitch
50 Gallon Transfer Flow in bed tank w/ Trax 3
2018 Montana 3121RL
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04-15-2019, 02:23 PM
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#5
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Established Member
Join Date: Jan 2018
Location: Amherst
Posts: 40
M.O.C. #21043
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Flex seal tape put it on and don’t worry about it any more. I tried the underbelly tape that is sold at rv centers for this and it did not hold any longer than it took to put it om.
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04-15-2019, 05:10 PM
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#6
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Montana Master
Join Date: Jul 2010
Location: Lake Havasu City AZ.
Posts: 1,811
M.O.C. #10552
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DO NOT cut. take out the fasteners and do it right. Had mobile service guy tale a knife to my rig and cut two hydraulic lines. Yep $1,00.00 to fix it.
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Wayne and Ann Moore
2015 Ford F-350 King Ranch
Firestone air bags, bed saver.
Add 40 GAL tank in bed.
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04-15-2019, 06:56 PM
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#7
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Montana Master
Join Date: Jun 2018
Location: Carson City
Posts: 2,017
M.O.C. #21963
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X2 ^^^^
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2016 3160, Legacy, Sailuns, Splendide 2100 xc vented, 1 1/2" axle lift blocks, disk brakes. 2014 Ram 3500 SRW SWB 4X4 6.7 Aisin Mega Cab, EBC slotted disks and brakes, Titan fuel tank.
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04-15-2019, 09:26 PM
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#8
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Montana Master
Join Date: Oct 2017
Location: Bee Branch
Posts: 2,620
M.O.C. #20693
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If you want to do it right: Drill/pry out the factory fasteners and replace with self tapping screws and fender washers. The wide fender washers greatly reduce the chance of the screws ripping thru the corplast. Anything you can do to keep a good seal with the underbelly will help reduce the rodents that love to wreak havoc under the rig. I speak of experience, never let anyone take a knife to the corplast and then tape it up!!
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James & Irene Wilson
Bee Branch, AR.
2017 Ram 1 ton diesel duallyCrew Cab/Long Bed
2018 Montana High Country 381TH Garage Full of Toys
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04-15-2019, 09:56 PM
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#9
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,677
M.O.C. #12947
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Absolutely do not cut into the belly coroplast. You will just be making more work for yourself and as was said, you risk unknown damage to hydraulic and electric that will be laying on the coroplast. They build these rigs upside down when installing things in the belly, then flip it over, hoping to never see it again. This is a photo of all the hydraulics and electric that had been laying on the coroplast and ultimately ended up hanging way down once the coroplast was removed. I installed hangers and cable tied all this up prior to repairing a crack in the grey tank.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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04-16-2019, 07:46 AM
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#10
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Montana Master
Join Date: Mar 2016
Location: Catoosa
Posts: 772
M.O.C. #18384
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If you're capable of doing any repairs under the coroplast than you're capable of removing the coroplast and reattaching as so many have advised. It's just not that hard. The only reason to cut it is laziness, or you're over paying someone to work on it by the hour! If you're intent on cutting it than at least be careful and just barely cut through it with a razor knife, even that could still cause damage Make your U shaped cut so that the opening faces the rear in order to help avoid airflow trying to open the flap. DON'T BE LAZY!
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2015 3100RL legacy...2005 Ford F-250 CC SB. Tows like a charm! 4/19 Updated to 2017 Chevy 3500 CC SB SRW -hope it tows as well as my F 250 did!
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04-16-2019, 09:41 AM
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#11
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Montana Master
Join Date: Oct 2015
Location: westminster md
Posts: 2,318
M.O.C. #17894
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For the most part I agree not to cut into it if you don't have to. However, I unfastened/removed as much as possible on my unit so I could clean up and paint the badly rusted up frame. It would have been near impossible to remove it entirely since the drain lines and propane lines etc. are going through it. Some times you will have no choice but to cut it open which I did to assess the galley tank valve for replacement. Just cut 3 sides leaving the uncut side towards the front of the trailer to act as a hinge so you can fold it back into place and tape it up. As mentioned, Gorilla tape works good if you clean up the area with alcohol.
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2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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04-16-2019, 07:49 PM
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#12
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Montana Fan
Join Date: Oct 2017
Location: Tyler
Posts: 186
M.O.C. #20704
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Thank you all for the great information!
__________________
Maxwell and Beverly Dow
2018 3730FL 2020 Ram 3500 Dually SWB
"Prairie Schooner"
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04-16-2019, 07:50 PM
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#13
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Montana Fan
Join Date: Oct 2017
Location: Tyler
Posts: 186
M.O.C. #20704
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Wow - that could have been an expensive! Nice job!
__________________
Maxwell and Beverly Dow
2018 3730FL 2020 Ram 3500 Dually SWB
"Prairie Schooner"
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04-17-2019, 01:11 AM
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#14
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Montana Master
Join Date: May 2017
Location: new caney
Posts: 1,050
M.O.C. #19873
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I just dropped my coroplast to change a gray tank seals. You usually only need to drop about 3 feet of coroplast to work on your tank valves. Reinstalling the coroplast is not a big deal as many think it is. Just don't drop more coroplast than you need.
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04-17-2019, 04:50 PM
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#15
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Montana Master
Join Date: Oct 2015
Location: westminster md
Posts: 2,318
M.O.C. #17894
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Texan, Dropping it for the front 2 tank it easy like you state. The galley tank is a whole other issue.
__________________
2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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04-17-2019, 07:12 PM
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#16
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Montana Master
Join Date: May 2017
Location: new caney
Posts: 1,050
M.O.C. #19873
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You are correct. I guess I should have stated that but the gray and black are the ones most people work on. I have more tolerance with the galley than the other two. Hopefully I want have to ever deal with the galley.
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04-21-2019, 01:54 PM
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#17
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Montana Fan
Join Date: Aug 2010
Location: Dundas
Posts: 406
M.O.C. #10690
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I plan to replace all the self tappers holding the coroplast on our next new fiver with stainless screws. Had to open the belly on our 2011 Montana and snapped many rusted factory originals off. I'll add good sized fiber washers to help support the coroplast. Trying to decide on a spray on rust prevention for the steel beam while I'm at it.
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04-21-2019, 02:13 PM
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#18
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Montana Master
Join Date: Oct 2017
Location: Bee Branch
Posts: 2,620
M.O.C. #20693
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Quote:
Originally Posted by drsmart
I plan to replace all the self tappers holding the coroplast on our next new fiver with stainless screws. Had to open the belly on our 2011 Montana and snapped many rusted factory originals off. I'll add good sized fiber washers to help support the coroplast. Trying to decide on a spray on rust prevention for the steel beam while I'm at it.
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You know I hadn't thought of that but undercoating the beams sounds like a good idea......
__________________
James & Irene Wilson
Bee Branch, AR.
2017 Ram 1 ton diesel duallyCrew Cab/Long Bed
2018 Montana High Country 381TH Garage Full of Toys
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04-21-2019, 02:17 PM
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#19
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Montana Fan
Join Date: Aug 2010
Location: Dundas
Posts: 406
M.O.C. #10690
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I just realized, what ever spray is used, make sure it won't affect plastic (coroplast).
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04-21-2019, 03:10 PM
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#20
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Montana Master
Join Date: May 2017
Location: new caney
Posts: 1,050
M.O.C. #19873
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Quote:
Originally Posted by mtlakejim
You know I hadn't thought of that but undercoating the beams sounds like a good idea......
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I don't know if it's a good idea Jim or a lot of work. I don't think I or just about anyone else will keep there rv long enough to have the I-beams rust out.
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