Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 22-07-2012, 14:22   #46
Formerly: Capt Wraun
 
Sir Rondo Normal's Avatar

Join Date: Sep 2011
Location: Port Louis, Haida Gwaii (The edge of the world)
Boat: Corbin39 CC Cutter Rig
Posts: 431
Re: The Blonde Zinc Replacement

Apply the threadlock to the screw before you go under. Let it set up, then it's like a nylock nut
__________________

__________________
*** If it ain't broke... just wait! ***
Sir Rondo Normal is offline   Reply With Quote
Old 22-07-2012, 14:34   #47
Registered User
 
sy_gilana's Avatar

Join Date: Jan 2005
Location: On board
Boat: Van de Stadt 50'
Posts: 1,101
Send a message via Skype™ to sy_gilana
Re: The Blonde Zinc Replacement

Hiya Sailorchick, As I have read several of your posts before, I know I am speaking to a peer or senior, in terms of engineering.

I have a 11 pound anode bolted into the floor of my seachest, I have magnesium ones in the bottom of my bilges in case of a leak of any type of water. I have anodes in my holding tank. I'm with you totally on this one.
Theoretically.

Now allow me to comment as a sailor, steel boat owner, diver, and Mr Fixit for a lot of boats over the last 14 years. Get a prop anode on there asap. Get ready in the water, have someone assist by handing you the allen? bolt inside the anode, head down with the allen key inserted. Use Loctite on the threads a good coating, and dive and insert it. The loctite will only set after a while, it requires O2 to go off. The anode will fall off, but the bolt will be there, and you can break it out again. Better yet it will rattle and tell you its time to change it.

I like your thinking.
__________________

__________________
Tight sheets to ya.
http://gilana.org
sy_gilana is offline   Reply With Quote
Old 22-07-2012, 14:35   #48
cat herder, extreme blacksheep
 
zeehag's Avatar

Cruisers Forum Supporter

Join Date: Jul 2008
Location: furycame alley , tropics, mexico for now
Boat: 1976 FORMOSA yankee clipper 41
Posts: 17,770
Images: 56
Send a message via Yahoo to zeehag Send a message via Skype™ to zeehag
Re: The Blonde Zinc Replacement

i adapt my collar zincs to use a lock washer so they dont fall off--when i dont do that, they go away and cause bad vibration---mine doesnt use a prop end zinc--just the collar. i have only had one fall since i began using lock washers with em
zeehag is offline   Reply With Quote
Old 22-07-2012, 15:08   #49
Marine Service Provider
 
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 3,594
Re: The Blonde Zinc Replacement

Quote:
Originally Posted by Capt Wraun View Post
Apply the threadlock to the screw before you go under. Let it set up, then it's like a nylock nut
No, it's not. Normal threadlocker requires oxygen to work. Pre-applying it to parts to be assembled underwater does is not effective. To my knowledge the only product that can be pre-applied to parts and then assembled underwater is Loctite 248 (which I have only found online.) This from one of the parent company's engineers.

http://www.amazon.com/Loctite-QuickS.../dp/B000132VH6
__________________
fstbttms is offline   Reply With Quote
Old 22-07-2012, 15:16   #50
Formerly: Capt Wraun
 
Sir Rondo Normal's Avatar

Join Date: Sep 2011
Location: Port Louis, Haida Gwaii (The edge of the world)
Boat: Corbin39 CC Cutter Rig
Posts: 431
Re: The Blonde Zinc Replacement

Quote:
Originally Posted by fstbttms View Post
No, it's not.
Ya... it is "like" as in similar to a nylock nut.
That is what loctite does, mimmicks a nylock nut.

Quote:
Originally Posted by fstbttms View Post
To my knowledge the only product that can be pre-applied to parts and then assembled underwater is Loctite 248
Sorry for being too generic. Use Loctite 248
__________________
*** If it ain't broke... just wait! ***
Sir Rondo Normal is offline   Reply With Quote
Old 22-07-2012, 15:29   #51
Moderator
 
noelex 77's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Location: Living on dirt waiting for our new yacht to be built.
Boat: Half built Bestevaer.
Posts: 10,619
Re: The Blonde Zinc Replacement

Threadlockers, like loctite, are anerobic glues. They set in absence of oxygen.
Establish a good metal metal metal bond and they will set.

Be careful when using these products you do not inhibit the electrical conductivity between the anode (zinc) and the metal ( such as the prop) that wish to protect.
Insulating the zinc, to prevent wastage, around the screws is preferable IMHO.
__________________
noelex 77 is offline   Reply With Quote
Old 22-07-2012, 15:38   #52
Moderator
 
sailorchic34's Avatar

Cruisers Forum Supporter

Join Date: Feb 2011
Location: SF Bay Area
Boat: Islander 34
Posts: 4,812
Re: The Blonde Zinc Replacement

Just FYI, thought I would measure the voltage between the prop shaft and the wire to the sea strainer zinc. Based on my trusty $12 voltmeter I get 11 millivolts with negative being toward the sea strainer zinc.

I also decided to check the potential directly at the zinc (with the wire and sea strainer cover removed) to the prop shaft and got the same reading

Of course what I need to do is hang a zinc on a wire over the side and measure the voltage between it and the prop shaft... So more experimentation is required.

But I am getting a voltage potential which is nice. It tells me that the Zinc is in circuit and doing its mojo.. Just not sure what the normal reading should be in fresh water..
__________________
sailorchic34 is offline   Reply With Quote
Old 22-07-2012, 15:41   #53
Senior Cruiser
 
Jim Cate's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: cruising SW Pacific
Boat: Jon Sayer 1-off 46 ft fract rig sloop strip plank in W Red Cedar
Posts: 11,450
Re: The Blonde Zinc Replacement

Actually guys you have it backwards about Loctite: it is an anaerobic adhesive. This means that for it to cure oxygen must be EXCLUDED from its surface. It must also be in contact with an active metal ion surface as well, but it is the exclusion from oxygen that triggers the reaction.

Think about it -- it stays liquid in the bottle (always at least half full of air, 'cause they only fill them half way for just that reason). It stays liquid when you apply it to the surface of the fastener. Then when you assemble the fastener and prevent air from getting to the Loctitie it sets up.

I'm not familiar with their 248 and can't comment upon its properties...

Cheers,

Jim

edit: oops, I see that Nolex beat me to the punch here!
__________________
Jim and Ann s/v Insatiable II , lying Port Cygnet, Tasmania once again
Jim Cate is offline   Reply With Quote
Old 22-07-2012, 15:52   #54
Formerly: Capt Wraun
 
Sir Rondo Normal's Avatar

Join Date: Sep 2011
Location: Port Louis, Haida Gwaii (The edge of the world)
Boat: Corbin39 CC Cutter Rig
Posts: 431
Re: The Blonde Zinc Replacement

This is like a union meeting. An awful lot of talk for such a simple fix
__________________
*** If it ain't broke... just wait! ***
Sir Rondo Normal is offline   Reply With Quote
Old 22-07-2012, 16:03   #55
Moderator
 
sailorchic34's Avatar

Cruisers Forum Supporter

Join Date: Feb 2011
Location: SF Bay Area
Boat: Islander 34
Posts: 4,812
Re: The Blonde Zinc Replacement

Good think I did not start an anchor thread. But I know better then that.

BTW, checked the abyc papers and found in salt water you want 200 millivolts difference between the anode and that being protected. Still looking for the fresh water readings..

http://www.abycinc.org/committees/E-02.pdf
__________________
sailorchic34 is offline   Reply With Quote
Old 22-07-2012, 16:19   #56
Marine Service Provider
 
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 3,594
Re: The Blonde Zinc Replacement

Quote:
Originally Posted by Jim Cate View Post
Actually guys you have it backwards about Loctite: it is an anaerobic adhesive. This means that for it to cure oxygen must be EXCLUDED from its surface. It must also be in contact with an active metal ion surface as well, but it is the exclusion from oxygen that triggers the reaction.

Think about it -- it stays liquid in the bottle (always at least half full of air, 'cause they only fill them half way for just that reason). It stays liquid when you apply it to the surface of the fastener. Then when you assemble the fastener and prevent air from getting to the Loctitie it sets up.

I'm not familiar with their 248 and can't comment upon its properties...

Cheers,

Jim

edit: oops, I see that Nolex beat me to the punch here!
You both are correct, of course. In my defense, I have been brewing/drinking beer since about 10:00 a.m.

In any event, according to the manufacturer (whom I contacted after participating in a similar thread, maybe on this forum), Loctite 248 is the only thread locker that can be applied topsides and assembled underwater.
__________________
fstbttms is offline   Reply With Quote
Old 22-07-2012, 16:24   #57
Registered User
 
LeaseOnLife's Avatar

Join Date: Apr 2008
Location: out cruising again
Boat: Sailboat
Posts: 1,046
Re: The Blonde Zinc Replacement

The loctite 248 works underwater because it is a paste. The 'normal' blue loctite 242 is a thin fluid and washes away too easily in the water.
__________________
LeaseOnLife is offline   Reply With Quote
Old 22-07-2012, 16:28   #58
Formerly: Capt Wraun
 
Sir Rondo Normal's Avatar

Join Date: Sep 2011
Location: Port Louis, Haida Gwaii (The edge of the world)
Boat: Corbin39 CC Cutter Rig
Posts: 431
Re: The Blonde Zinc Replacement

lmao, the girl is talking technical and the guys are arguing over which goop to use.
__________________
*** If it ain't broke... just wait! ***
Sir Rondo Normal is offline   Reply With Quote
Old 22-07-2012, 16:29   #59
Registered User
 
LeaseOnLife's Avatar

Join Date: Apr 2008
Location: out cruising again
Boat: Sailboat
Posts: 1,046
Re: The Blonde Zinc Replacement

Quote:
Originally Posted by zeehag View Post
i adapt my collar zincs to use a lock washer so they dont fall off--when i dont do that, they go away and cause bad vibration---mine doesnt use a prop end zinc--just the collar. i have only had one fall since i began using lock washers with em
Lockwashers won't help on the prop-zinc: The lockwasher works against the underlying material, the zinc, which will be gone, then the lockwasher can't work. On the collar zincs, I use lock-nuts.
__________________
LeaseOnLife is offline   Reply With Quote
Old 22-07-2012, 16:31   #60
cat herder, extreme blacksheep
 
zeehag's Avatar

Cruisers Forum Supporter

Join Date: Jul 2008
Location: furycame alley , tropics, mexico for now
Boat: 1976 FORMOSA yankee clipper 41
Posts: 17,770
Images: 56
Send a message via Yahoo to zeehag Send a message via Skype™ to zeehag
Re: The Blonde Zinc Replacement

i have yet to use locktite on my zincs--a lock washer usually is sufficient.
i dont know much about the prop end zincs--but the collars do well with lock washers applied.
__________________

zeehag is offline   Reply With Quote
Reply

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




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 06:21.


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.