Replacing the windows on an M17 and M15

Discussion about the boats Jerry Montgomery created: sailing, maintenance, repair and renovation.
Message
Author
User avatar
scoob
Posts: 925
Joined: Mon Jan 03, 2011 4:36 pm
Location: Golden, CO
Contact:

Replacing the windows on an M17 and M15

#1 Post by scoob » Fri Apr 11, 2014 3:52 pm

to remove the windows undo the bolts (technically machine screws) and from inside the cabin push the windows off the boat.

clean up the opening flange to remove dirt and the old silicone. lightly sand the flange with 80grit sandpaper (get a bit more mechanical bond) and re-clean.
80 grit sanding.jpg
(click image for a larger version)


after removing the old windows use them as a template to drill the mounting holes in the new windows.

the holes in the window are just a bit larger than the fasteners (bolts). duplicate the diameter of the hole by testing drill bits in the old window's holes. this slightly larger hole is to allow for expansion of the windows and the movement the deck/hull.

drill the holes straight. this is where a drill press comes in handy.

once the holes are drilled you need to bevel them to accept the oval head machine screws that hold the windows onto the boat. look at the old windows as an example.

concerning the fasteners. if the old fasteners are in good condition (no rusting or signs of crevice corrosion) they can be reused. if not purchase 316 or 18-8 stainless (not stuff from a hardware store, from a marine store or a vendor that will guarantee the grade of the steel). 316 is better than 18-8 ... though they are 'really close' in performance (especially for the window fastening application).

dry fit the window. if needed sand the edge of the window so it fits onto the flange.
80 grit sanding.jpg
(click image for a larger version)


install the window. only the fasteners in the corners are necessary for this step. don't over-tighten ...don't want to crack the window.
80 grit sanding.jpg
(click image for a larger version)


inside the cabin, using a VERY sharp knife or a hobby knife, scar the paper along the edge of the window flange.
80 grit sanding.jpg
(click image for a larger version)


uninstall the window.

on the interior side of the window remove the outer edge protective paper.
80 grit sanding.jpg
(click image for a larger version)
Attachments
window ready to install.jpg
scaring interior paper.jpg
first dry fitting.jpg
final fit adjustment.jpg
--
:: Dave Scobie
::
::
:: my boat's www-site - http://www.m17-375.webs.com

User avatar
scoob
Posts: 925
Joined: Mon Jan 03, 2011 4:36 pm
Location: Golden, CO
Contact:

#2 Post by scoob » Fri Apr 11, 2014 4:01 pm

apply silicone in two beads so the flange is well covered.
interior nut and washer.jpg
(click image for a larger version)

press the window in place.
interior nut and washer.jpg
(click image for a larger version)


loosely install fasteners starting with corners.
interior nut and washer.jpg
interior nut and washer.jpg


tighten the fasteners by working your way around the window. NOT TO TIGHT as you want some silicone to remain to act as a gasket. be sure you have squeeze-out.
interior nut and washer.jpg
(click image for a larger version)
Attachments
apply silicone.jpg
bolt from outside.jpg
squeeze out.jpg
push window in place.jpg
--
:: Dave Scobie
::
::
:: my boat's www-site - http://www.m17-375.webs.com

User avatar
scoob
Posts: 925
Joined: Mon Jan 03, 2011 4:36 pm
Location: Golden, CO
Contact:

#3 Post by scoob » Fri Apr 11, 2014 4:03 pm

clean up the squeeze-out both inside the cabin and outside by first using a scraper then a shop towel. make sure you remove all the silicone from the gelcoat both in the cabin and outside as once it drys it is very difficult to remove.
scraper.jpg
scraper.jpg
scraper.jpg
scraper.jpg
(click image for a larger version)


a scraper can be as simple as a piece of scrap wood that has a beveled 'sharp' edge. you want something that will not scratch the gelcoat -
scraper.jpg
(click image for a larger version)
Attachments
wipe.jpg
scrape in.jpg
scrape out 2.jpg
scrape out 1.jpg
--
:: Dave Scobie
::
::
:: my boat's www-site - http://www.m17-375.webs.com

User avatar
scoob
Posts: 925
Joined: Mon Jan 03, 2011 4:36 pm
Location: Golden, CO
Contact:

#4 Post by scoob » Fri Apr 11, 2014 4:53 pm

allow the silicon to cure.

to remove the paper inside the cabin first cut along the edge of the opening with a VERY sharp knife. (this step is not needed on the outside paper.)
The attachment scaring interior paper.jpg is no longer available
(click image for a larger version)


carefully remove the paper. the sharp knife can help in catching the paper's edge.

WARNING: if the boat is outside do not allow the paper to stay on the window for more than a couple of days ... the paper is not UV stable will become stuck to the window!

if you have any questions about the process please give myself or Matt a call - 800-621-1065. you can also send me an email - dave {at} sagemarine {dot} com
Attachments
scaring interior paper.jpg
--
:: Dave Scobie
::
::
:: my boat's www-site - http://www.m17-375.webs.com

Sea Sprite
Posts: 154
Joined: Mon Jul 25, 2011 11:38 am

#5 Post by Sea Sprite » Mon Apr 14, 2014 6:16 pm

Great information!

Post Reply