Beckson Portlights - SailNet Community
Reply
 
LinkBack Thread Tools
post #1 of 11 Old 11-18-2017 Thread Starter
Member
 
Join Date: Nov 2016
Posts: 53
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 3
 
Beckson Portlights

Hi all, still at the repairs on our N28. I had posted earlier about the fixed portlights leaking some. The two Beckson opening portlights are leaking too. Both around the port seal and around the flange. So I figured it was time to pull them, rebed the frame and replace the seal. The screens also needed replacement. After scouring the net, I came to the conclusion that the portlights are the originals, as beckson changed the design in 1983. Anyway, they still make the replacement parts for the older ports. Mine are the 512 model. Anyway, the lenses are not very clear anymore either. So after much research, I figured a set of new lenses, seals and screens would cost me about $200.00. I found a company that sells the complete NEW 512 portlights for $116.00 each, so I ordered a new set. With sales tax, it cane to $250.00. More than I wanted to spend, but now I have all new components that should last another 35 years! I hope to replace them in the next week or so, weather permitting. I will be using Dow 795 white structural silicon to bed them. I thought about using butyl tape, but for this purpose, I think the 795 will be a better product. When I pull the fixed portlights with the aluminum frames, I will use the butyl tape for those. Need to get some butyl ordered. I hear there re some issue with the run of the mill butyl available compared that supplied by an on line company specializing in marine products. Anyone have any experience with their Bed-It Butyl Tape? Is there really any difference? I've use butyl before, and actually had a few rolls of it, but got rid of it a few years ago thinking I did not need it anymore. That was a mistake!

Thanks
Mitch
MitchK is online now  
Sponsored Links
Advertisement
 
post #2 of 11 Old 11-18-2017
Senior Member
 
CVAT's Avatar
 
Join Date: Apr 2012
Location: Raleigh, NC
Posts: 162
Thanks: 12
Thanked 12 Times in 12 Posts
Rep Power: 8
 
Re: Beckson Portlights

Problem with Silicon has been reported on these forums over and over, Great for bedding Acrylic, terrible for anything else as nothing sticks to silicon, not even silicon. See Mainesails self-help at:Re-Bedding Deck Hardware With Bed-It Tape Photo Gallery by Compass Marine How To at pbase.com.

I used 795 in the navy for water intrusion prevention on F-14's, to get it to seal properly we had to sand down to bare metal and repaint all surfaces to get it to bond correctly. In addition, all hardware, screws and washers and such had to be replaced with new ones. So for a simple alignment of a "Black Box" with 4 screws on a side we would have to disassemble the entire box, all paint a to bare metal where the 795 was in contact; allodyne ( a conversion coating for aluminium and corrosion preventive) the aluminium, prime and top coat the painted surfaces. Replace the 16 screws, lock washers and sacrificial washers with new ones, we had tried to use an ultrasonic cleaner to clean them to no avail. This was all for a 5 to 10 minute alignment, the supporting maintenance took on average 3 days, to disassemble, send to airframes shop to be stripped and repainted. The good news is that if we did this the "Black Box" stayed out not needing repair for months even years, the bad if a part was skimped or not done, this was often the "black box" was back in for repair due to water and or other fluid intrusion and required repair now not just alignment. So I would personally use 795 only if necessary and would use Butyl Tape or similar bedding above the waterline.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Use your head for something other than a hat rest.
CVAT is offline  
post #3 of 11 Old 11-18-2017
Senior Member
 
roverhi's Avatar
 
Join Date: Dec 2013
Location: Kona, Hawaii
Posts: 847
Thanks: 5
Thanked 69 Times in 66 Posts
Rep Power: 6
 
Re: Beckson Portlights

Are Beckson ports compatible with Butyl??
roverhi is online now  
 
post #4 of 11 Old 11-18-2017
Senior Member
 
CVAT's Avatar
 
Join Date: Apr 2012
Location: Raleigh, NC
Posts: 162
Thanks: 12
Thanked 12 Times in 12 Posts
Rep Power: 8
 
Re: Beckson Portlights

Quote:
Originally Posted by roverhi View Post
Are Beckson ports compatible with Butyl??
What isn't compatible with Butyl? other than below water line.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Use your head for something other than a hat rest.
CVAT is offline  
post #5 of 11 Old 11-18-2017 Thread Starter
Member
 
Join Date: Nov 2016
Posts: 53
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 3
 
Re: Beckson Portlights

Beckson specifically says to use silicon. I figured if that is what the manufacturer recommends, then that is probably what I should use. The Dow 795 seems to have a pretty good reputation for sealing plastic to other surfaces. Since the Beckson port is made of plastic, it seems to make sense to use silicon. We'll see what they are currently bedded with when I remove them. Didn't get a chance to work on them this weekend. I spent today installing class V receiver on my truck. Tomorrow, I will be pulling our Clipper Marine CM26 out of the water for the winter, so probably will not get to it this weekend. Maybe over the Thanksgiving weekend I'll get a chance.

Mitch
MitchK is online now  
post #6 of 11 Old 11-18-2017
Senior Member
 
CVAT's Avatar
 
Join Date: Apr 2012
Location: Raleigh, NC
Posts: 162
Thanks: 12
Thanked 12 Times in 12 Posts
Rep Power: 8
 
Re: Beckson Portlights

Then use silicon because your mating plastic and the manufacturer specifies it. 795 is a good product, just requires a lot of prep, ensure your surface is clean and free of silicon and other contaminants as with anything prep work is the most important aspect of the job, the better the prep the better the job. If silicon was used just make sure you remove all of it prior to attempting to bed the new portlights. Good luck, and be meticulous, done right 795 seals well, the problem with it though it is so easy to do wrong, any residue will cause it to fail. Good luck again and take your time.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Use your head for something other than a hat rest.
CVAT is offline  
post #7 of 11 Old 11-23-2017 Thread Starter
Member
 
Join Date: Nov 2016
Posts: 53
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 3
 
Re: Beckson Portlights

Hi all and Happy Thanksgiving.
Just a short update on the N28-2 repairs. I have leaks in both Beckson port lights around the flange and the seal. So purchased a set of new ones. Anyway, I do not know what they used when they bedded them last, but it is a major pain trying to get them out! Finally got the outer bezel off, and cut the sealant as best I could. Frame would not move. Made up a improvised pressing fixture with what I had on hand, and started to apply force. Unfortunately, the 1/4-20 bolts I was using galled, and I had to cut the bolts to get the jig off so I could close up the window for the night. Put a small bead of marine silicon around the opening to close it up for the night. I was just trying to keep the rain we were expecting form soaking the inside of the boat. I did put a couple of buckets under the port to catch any leaks. The frame had separated over about 1/3 of the length top and bottom before the bolts galled. I should have used a bit of oil on them before I started. Oh, well, I picked up some 5" carriage bolts and made a couple of new press plates from some 3/4 x 4" pine boards. Tomorrow it is supposed to be clear, so I will get back to the removal then. I plane on routing the edge of the opening with a trim router and 45 degree cutter to make sure there is room for a nice bead of sealant when I put them back together.

Mitch

Last edited by MitchK; 11-26-2017 at 11:00 PM.
MitchK is online now  
post #8 of 11 Old 11-23-2017
Senior Member
 
Join Date: Oct 2011
Location: Nanaimo B.C.
Posts: 4,426
Thanks: 5
Thanked 135 Times in 134 Posts
Rep Power: 8
 
Re: Beckson Portlights

Partial rolls of butyl tape are often found in the dumpster at auto window repair shops, Of course some feel the need to spend big to cover lack of skill and initiative.
Capt Len is offline  
post #9 of 11 Old 11-24-2017 Thread Starter
Member
 
Join Date: Nov 2016
Posts: 53
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 3
 
Re: Beckson Portlights

Capt Len,
Thanks for the tip on locating butyl tape. I'll keep that in mind if I am ever near a auto window repair place. Not entirely sure what the rest of your post is supposed to mean.
MitchK is online now  
post #10 of 11 Old 11-24-2017
ASA and PSIA Instructor
 
Join Date: Apr 2000
Posts: 4,037
Thanks: 14
Thanked 52 Times in 50 Posts
Rep Power: 20
 
Re: Beckson Portlights

Quote:
Originally Posted by CVAT View Post
Problem with Silicon has been reported on these forums over and over, Great for bedding Acrylic, terrible for anything else as nothing sticks to silicon, not even silicon. ...
FWIW, in addition to installing Beckson port frames with the Beckson recommended silicone, in the past when I've replaced the lens in two different types of deck hatches, both manufacturers specified to use silicone. The Bomar folks even ship tubes of their own labeled silicone...

For the OP, I suggest using all new hardware with the new ports, any re-used bolts are a likely source of leaks...

Certified...in several regards...

Last edited by sailingfool; 11-24-2017 at 04:30 PM.
sailingfool is offline  
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Cheap Beckson Porlight Screen Fix arf145 Gear & Maintenance 6 05-25-2012 01:17 PM
Resealing/Replacing Beckson Ports? HBBurlington CS Yachts 14 04-05-2012 04:16 PM
Lewmar, Bomar, Beckson ports... cghubbell Gear & Maintenance 6 09-14-2009 10:20 PM
Beckson port gaskets grinfax Gear & Maintenance 4 10-26-2008 01:32 PM
Beckson port gasket saltypat Gear & Maintenance 5 05-25-2008 08:14 AM

Posting Rules  
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome