Hi,
so here is the update as I received both MG16RW and MG17RW this week.
So good news, there is a wndow that works (the square one, the MG16RW)
Here how it went:
- I started by removing (slidng out) the original Dometic C5 window by removing the sceen/blind plastic assembly inside the Lance, unscrewing the 2 window supports on each side and unscrewing the lttle plastic rail bumper on the outside rail and slide the window out. I then removed the window gasket which is really only held in place by Dicor (and by the 4 "locks")
- I first tried the 900x500 MG17RW (this is the one with the round side) and it was obvious that it will not fill the entire openng. It is one think to have to shim inside, but this would require to create a new frame inside and outside (fiberglass and all) ... Maybe a 900x520 MG17RW would work, but I cannot find one (some sites on aliexpress claim they can do custom ...).
- I then tried the 900x500 MG16RW and it just covering the opening (like maybe 1/8" top and 1/8" bottom. The window frame is just being supported on the 4 corners, so time to shim. I had some lefttover marine plywood 1/2" thick. I cut 2x 33" x 1"1/4 to shim the top and bottom (the wall foam core is 1"1/4 thick). At the bottom, there are those metal support/plate that I used to screw (selftapping) the bottom shim (I also used wood glue). The top shim is only screwed/held into place by screwing in the foam core (and wood glue).
- Then the install is pretty straightforward. I applied Dicor all around the external frame (3/4" width works). Pushed the window in the hole, secured with painters tape and move inside. I used the provided hardware for the 6x side supports. for the 8x top and bottom, I made my own angles (a little longer) so the window is thighten to the wall (and not to the shim)
- I am not sure about the torque to put on the screw/hardware, but I stopped when I had a nice compression of the Dicor sealing uniform outside.
- I added some expandable foam in the gaps all around, but I do not think it will realy make a difference or that it is needed.
- Again, a 900x520 could have been better, but I would have been forced to "square" the opening corners as with the 900x500 it fits.
- Painting will be required inside as the screen/blind assy is also smaller that the previous.
I still need to replace the passenger side, and maybe I will replace all 4 so it looks nicer (the window is not that expensive)
I hope this post will help. I am heading to Mammott next week end. I will post if I have problems with the window.
- This is the 900x500 MG16RW that I found on Amazon (there are plenty of vendors on Ebay too)
-Here are the photos of the install
Cheers