HOW TO INSTALL NEW WINDOW TRACKS
A "how to" story with tips and tricks for a 1975 28' Express.
We were taking the hardware off during the first phase of the
"Top side paint job" and discovered the plastic window tracks needed to be replaced. Aluminum window track is the choice material here and six lenghts of 6' track would do the job. John Althouse at
Marinette.com sent the
track and the poly glide to me promptly. Got the #6, 1/2" SS flathead screws and
Dow Corning® Contractor's Weatherproofing Sealant from
Grainger online. Total cost - $400. (The CWS was also used as a glazing on the fixed windows)
Labeled and removed the screens and glass. Removed all the plastic track and saved. Noted where each piece was removed from. Scraped, wire brushed, sanded, and vacuumed the window frames to clean. Used 3M 4200 to seal all the old holes.
Started with the port fore bottom piece. Measured the old piece and compared it to the actual measured inside length from weld bead to center post. Decided to go with actual measurements instead of using the old stuff for pattern. Threw all the old track in the trash.
Cut a 45* miter on the fore and straight cut the aft using my trusty Dewalt compound miter saw with a carbide tipped blade. Had to make custom cuts on each piece to accommodate the weld bead. In some cases the weld bead was ground down to provide a better fit, and to allow clearance for debris and drainage.
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After experimenting with different size drill bits, a 3mm gave a tight but easy to sink fit with the #6 screws.
While holding the channel in the right location, one hole was made near the aft end (noting not to drill where the old hole was) through the track and window sill with the 3mm. A screw was then twisted through both the track and sill followed by 3 more evenly spaced.
The center post piece was straight cut so it sat atop the bottom track and butted up flush to the top. 2 screws.
The top piece was straight cut aft and 45* cut fore as to butt up to the angled window channel. 4 screws.
The final angled piece was cut 45* on both ends. 2 screws.
Satisfied with the fit, all pieces were removed and taken to the bench to be counter sunk with a 15/64" bit. Note: use care here as to not drill too deep (ah-hem) and ruin a hole and then have to reposition, re-drill, re-screw, and remove again.
Repeated above for the starboard fore tracks.
The aft window tracks were similar except for the aft posts that screw into plywood.
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The original sliding window track design required you to remove the bottom track to get the windows out. This is a royal pain. The solution is to reduce the height of the bottom track channel walls to allow clearance for the glass to be removed. John Althouse told me he had knowledge of it being done with plastic track but not with aluminum. I decided to blaze a trail for us Big M owners and tackle the problem.
A table saw was used to modify the track's first three channel walls. After setting the fence for a 3/16" channel height and the blade height to only cut the first three walls, a few practice cuts were made and adjustments completed. Now for the big show.
The Admiral suggested moving the saw out on the grass because of the big mess that was made on the driveway during the practice cuts. I agreed and she supervised the setup.
Donning ear plugs, sweat band, leather gloves, and full face shield, we carried the four bottom tracks out to the job site. Making sure the facing of the track was down, I slowly fed the blade. Aluminum flakes hammered my left hand and pummeled the face shield as I focused on keeping the channel firmly against the fence. Sweaty arms were like Velcro to the flakes and had to be brushed off between cuts. The job was finished in 45 minutes.
The Dremmel tool with a deburring bit was used to smooth and clean up each wall. A file applied the finishing touches and all were thoroughly cleaned. Finally, the poly glide was laid into the bottom two narrow channels.
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All tracks were set into the window openings on a bead of Dow Corning® Contractor's Weatherproofing Sealant and each screw coated with 3M 4200. Sealant squeeze out was promptly cleaned off. Any gaps at the joints were taped to mask, filled in with
CWS, and mask removed.
The Admiral did a nice job on cleaning the sliders so I helped her put them in. We had to flip a couple around to get them to slide nice. The plastic stops that keep the forward glass from sliding aft were replaced with a piece of foam tape that was used to seal the gutters and the fixed windows during the
"Top side paint job".
SUMMARY:
Now it is piece of cake to clean the windows and those hard to reach places.
This is truly the way to go and it was totally worth the extra labor.
Thanks for taking the time to read my post.
Picture with text boxes hereMore pictures.
Surface Interval
1975 28' Express, Single M360
Specs:
http://www.boatm8.com/my...amp;page=boats&arr=0