Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 29-03-2016, 18:47   #1
Moderator
 
Hudson Force's Avatar

Cruisers Forum Supporter

Join Date: Nov 2008
Location: Lived aboard & cruised for 45 years,- now on a chair in my walk-in closet.
Boat: Morgan OI 413 1973 - Aythya
Posts: 7,894
Images: 1
New Portlights for my 1973 Morgan

I've been chasing leaks for 31 years among my 12 fixed portlights set in large rubber gaskets on my '73 Morgan and I've decided to apply 3/8" acrylic set over the apertures with 3M4991 tape and Dow 791.

The old 1/4" polycarbonate plates were clouded..


I removed the old portlights and cleaned the 1" thick fiberglass aperture for the ports....



Here's one of the four that I've completed. I have some pressure on this longer portlight to help secure a slight bend....


I'll post a full view when I finish this port side and turn around to work on the starboard.
__________________

__________________
Take care and joy, Aythya crew
Hudson Force is offline   Reply With Quote
Old 29-03-2016, 18:53   #2
Registered User
 
UNCIVILIZED's Avatar

Join Date: Jun 2014
Location: Up the mast, looking for clean wind.
Boat: Currently Shopping, & Heavily in LUST!
Posts: 5,629
Re: New Portlights for my 1973 Morgan

What'd you use for adhesive? Ditto on prep solvents?
__________________

__________________

The Uncommon Thing, The Hard Thing, The Important Thing (in Life): Making Promises to Yourself, And Keeping Them.
UNCIVILIZED is offline   Reply With Quote
Old 30-03-2016, 05:11   #3
Moderator
 
Hudson Force's Avatar

Cruisers Forum Supporter

Join Date: Nov 2008
Location: Lived aboard & cruised for 45 years,- now on a chair in my walk-in closet.
Boat: Morgan OI 413 1973 - Aythya
Posts: 7,894
Images: 1
Re: New Portlights for my 1973 Morgan

I used the 3M VHB 4991 two-sided acrylic foam tape 1" wide and 90 mils thick. The recommended solvent prep, after thoroughly cleaning and sanding with 220 grit paper, was wiping with 50% isopropyl alcohol and drying. After pressing in place I ran a bead of Dow 791 black sealant around the edge.

"Pressing in place" is critical. There's no second chance adjustment opportunity.
__________________
Take care and joy, Aythya crew
Hudson Force is offline   Reply With Quote
Old 30-03-2016, 05:45   #4
Registered User
 
Delancey's Avatar

Join Date: Oct 2011
Location: Miami, FL
Boat: sunk by irma
Posts: 3,462
Re: New Portlights for my 1973 Morgan

Looks real nice.

Sometimes, depending on what you are doing you can leave the release tape on the VHB except maybe a part of the end which you leave hanging off, place your part on top and position it, then pull the rest of the release tape out from underneath.
__________________
Delancey is offline   Reply With Quote
Old 30-03-2016, 06:00   #5
Moderator
 
Hudson Force's Avatar

Cruisers Forum Supporter

Join Date: Nov 2008
Location: Lived aboard & cruised for 45 years,- now on a chair in my walk-in closet.
Boat: Morgan OI 413 1973 - Aythya
Posts: 7,894
Images: 1
Re: New Portlights for my 1973 Morgan

Quote:
Originally Posted by Delancey View Post
Looks real nice.

Sometimes, depending on what you are doing you can leave the release tape on the VHB except maybe a part of the end which you leave hanging off, place your part on top and position it, then pull the rest of the release tape out from underneath.
I can imagine this technique working with some applications. 'not so much for me with this project. In order to make the tight radius turns at the ends of my portlights, I needed to cut sectors out of my tape every inch around the turn and this left me with, not one piece of release tape to pull, but about 24! I can imagine that there might be a substitute "release tape" material that could be placed over the VHB surface and pulled at the application as you describe, but I did not search this possibility.

This does seem like a good idea.
__________________
Take care and joy, Aythya crew
Hudson Force is offline   Reply With Quote
Old 30-03-2016, 10:14   #6
Registered User

Join Date: Nov 2015
Posts: 6
Re: New Portlights for my 1973 Morgan

I have the same problem. It looks like you have replaced the old gasket with a new one. Where did you get them?
__________________
Kadukuguam is offline   Reply With Quote
Old 30-03-2016, 10:43   #7
Moderator
 
Hudson Force's Avatar

Cruisers Forum Supporter

Join Date: Nov 2008
Location: Lived aboard & cruised for 45 years,- now on a chair in my walk-in closet.
Boat: Morgan OI 413 1973 - Aythya
Posts: 7,894
Images: 1
Re: New Portlights for my 1973 Morgan

Quote:
Originally Posted by Kadukuguam View Post
I have the same problem. It looks like you have replaced the old gasket with a new one. Where did you get them?
About 15 years ago I purchase these extrusions from Griffith Rubber Mills in Portland, Oregon. They are in their online catalog of "H" gaskets (1" to 1/4").
The only difference from the original Morgan gaskets is that the tight radius turns are not molded in and the locking strips are black instead of white.

I believe Griffith Rubber Mills sells these in fifty foot rolls. At the time I sold my excess from my application on my Morgan 41' to a guy with a 33' and he had a sufficient amount to complete his portlights.
__________________
Take care and joy, Aythya crew
Hudson Force is offline   Reply With Quote
Old 30-03-2016, 18:09   #8
Moderator
 
Hudson Force's Avatar

Cruisers Forum Supporter

Join Date: Nov 2008
Location: Lived aboard & cruised for 45 years,- now on a chair in my walk-in closet.
Boat: Morgan OI 413 1973 - Aythya
Posts: 7,894
Images: 1
Re: New Portlights for my 1973 Morgan

I finished the six fixed portlights on my port side today...



I'm fairly pleased with them. I guess I could have had them less proud if I had routed out a setting for them, but the VHB double-sided adhesive seems to have done well. They do cover a greater surface area than my former portlights, but I wanted the surface for best adhesion. Without the gaskets I do have more light below, but we've been quick to cover them with items on the shelves. We get more than enough sun in the cockpit and we like things dark below.

I'll be turning around in my current slip tomorrow so I can start on the starboard side.
Half done!
__________________
Take care and joy, Aythya crew
Hudson Force is offline   Reply With Quote
Old 30-03-2016, 18:55   #9
Registered User
 
Delancey's Avatar

Join Date: Oct 2011
Location: Miami, FL
Boat: sunk by irma
Posts: 3,462
Re: New Portlights for my 1973 Morgan

Nice work. Looks good!
__________________
Delancey is offline   Reply With Quote
Old 02-04-2016, 19:08   #10
Registered User

Join Date: May 2009
Location: Grenada
Boat: Shorebro,Royal 33 - Aloisius
Posts: 927
Re: New Portlights for my 1973 Morgan

If the radius is not molded in, then did the gasket lay flat or did it bunch up leaving gaps. I have been chasing leaks also. Luckily I always find some other problem to fix first.

So I like the company gasket supplier thanks. Now for the corner problem and maybe I will try.


Sent from my iPad using Cruisers Sailing Forum
__________________
landonshaw is offline   Reply With Quote
Old 02-04-2016, 19:48   #11
Moderator
 
Hudson Force's Avatar

Cruisers Forum Supporter

Join Date: Nov 2008
Location: Lived aboard & cruised for 45 years,- now on a chair in my walk-in closet.
Boat: Morgan OI 413 1973 - Aythya
Posts: 7,894
Images: 1
Re: New Portlights for my 1973 Morgan

Landonshaw, If you look closely at the photo in post #1 of the old replacement port that I installed about ten years ago using the Griffith Rubber Mills gasket without the molded end turns, you will see that the gasket is not as wide at the ends as the longer spans above and below. This is because I tapered the locking strip and omitted it from the turn. Omitting the locking strip at the tight radius allowed the gasket to fit and still kept everything tight. I was difficult to press the main portions of the locking strip into place and hopelessly distorted to include them in the turn.

'wise of you to notice this problem!
__________________
Take care and joy, Aythya crew
Hudson Force is offline   Reply With Quote
Old 03-04-2016, 16:25   #12
Moderator
 
Hudson Force's Avatar

Cruisers Forum Supporter

Join Date: Nov 2008
Location: Lived aboard & cruised for 45 years,- now on a chair in my walk-in closet.
Boat: Morgan OI 413 1973 - Aythya
Posts: 7,894
Images: 1
Re: New Portlights for my 1973 Morgan

I was asked a question by another cruiser today. I knew this question was coming and I thought I was ready for it. People just are not yet accustomed to seeing portlights sitting against the hull without frames or fasteners. The question was, "Don't you worry about the force of a storm wave knocking those acrylic portlights off?"

Well, bottom line is that I can conjure up a worry about most anything! I suggested that this same 3M VHB tape is holding huge windows to skyscrapers and windshields to 100 mph cars. My added thought is that the 3/8" plates are larger than the holes they cover and wave pressures would be pressing them to their position. I don't envision them being forced out from the inside, but there is the thought of having them peel away at their edge. Regardless, I'm not going to be truly worried about this.

Hey, if they fail, you guys will be among the first to know! I'll be giving them a test sometime. I doubt if I'll be offshore in a significant storm, but I do anchor in a tropical system now and then.

Oh, another factor in the mix,- total cost of materials when discounting my own labor and considering 12 fixed portlights comes to $75 each!
__________________
Take care and joy, Aythya crew
Hudson Force is offline   Reply With Quote
Old 08-04-2016, 16:00   #13
Moderator
 
Hudson Force's Avatar

Cruisers Forum Supporter

Join Date: Nov 2008
Location: Lived aboard & cruised for 45 years,- now on a chair in my walk-in closet.
Boat: Morgan OI 413 1973 - Aythya
Posts: 7,894
Images: 1
Re: New Portlights for my 1973 Morgan

'just a final report as I finished the last of the 12 portlights today.



I did end up with some success bending the two larger aft acrylic portlights. These required a bit of bending. A little research led me to the need to heat the acrylic to over 180* F to make a bend. All I needed was about a quarter inch over the 31" length. I put pressure on the outside with aluminum foil against the acrylic surface, using a taught block & tackle line with pads braced against the portlight. With this pressure holding them in the desired bend, I heated the inside of the acrylic portlight with a hair dryer that managed to reach a temperature of about 185* F for about ten minutes. My first attempt were with a wind outside and heat was removed to fast, but later, in still air I managed to reach the temperature for a bend. My other choice was to resort to a propane torch, but I managed with the gentler heat source.
__________________

__________________
Take care and joy, Aythya crew
Hudson Force is offline   Reply With Quote
Reply

Tags
morgan, portlights

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
1973 Morgan 28... My First Boat? lexilee Our Community 19 10-10-2013 16:31
For Sale: 1973 41 ft Morgan Out Island seastar41 Classifieds Archive 4 24-08-2013 12:11
Hailing Pre 1973 Morgan 38 Owners anna_maria Monohull Sailboats 4 23-10-2012 10:23
For Sale or Trade: 36 Morgan 1973 OI Mahipete Classifieds Archive 6 01-09-2012 19:49
For Sale: 1973 Morgan Outisland 33' SourGrapes Classifieds Archive 0 20-09-2010 11:59



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 22:09.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.