Shaft Zinc - SailNet Community
 
LinkBack Thread Tools
post #1 of 7 Old 06-06-2005 Thread Starter
Junior Member
 
Join Date: May 2003
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Shaft Zinc

I just splashed a "new boat" in the yard where I purchased it in New Jersey. They people who run the yard are very knowledgeable and don''t at all strike me as "flaky" or "incompetent".

However, they splashed the boat last week. I noticed on my bill that they had not added a shaft zinc. When I questioned them about that, they told me that the exposed shaft area was only about 1" between the cutlass bearing and the prop and there was no room to put a zinc on. They told me to check the engine zinc very carefully and replace as necessary (I have a Yanmar 2QM15).

I think this should work. As long as zinc is being eaten and not other metal I guess it doesn''t matter where it is (or does it?). Anyway, I''ve never heard of a boat not having a shaft or external zinc. The yard says they have had several boats over the years with this situation?

Am I ok by just checking the engine zinc and replacing as necessary? Or, are the telling me a tall tale?

Thanks.
FlySwat is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 7 Old 06-06-2005
Senior Member
 
Join Date: Feb 2003
Location: New England USA
Posts: 261
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 14
 
Shaft Zinc

There are some special zinc configurations out there. There is a "hockey puck" shaped zink that is a little under 1" thick. Not something the average yard would have, but readily available at most well stocked chandleries.

You don''t "Need" to have your zinc on your shaft. You can use a hull or keel mounted zinc IF your vessel is bonded. You can also hang a zinc "fish" over the rail, as long as you are connecting it to to a BONDED part of your boat. To protect your shaft and prop with this method, you will need to have it as part of the bonded network. You will need a bonded copper shaft brush, which rides on the shaft, making the electrical connection to your zinc.
Silmaril is offline  
Quote Quick Reply Share with Facebook
post #3 of 7 Old 06-06-2005 Thread Starter
Junior Member
 
Join Date: May 2003
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Shaft Zinc

Has anyone shaft mounted a "hockey puck" zink inside the hull? between the coupling and stuffing box?
FlySwat is offline  
Quote Quick Reply Share with Facebook
post #4 of 7 Old 06-06-2005 Thread Starter
Junior Member
 
Join Date: May 2003
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Shaft Zinc

Scratch my last - wouldn''t create the circuit.
FlySwat is offline  
Quote Quick Reply Share with Facebook
post #5 of 7 Old 06-10-2005
Junior Member
 
Join Date: Oct 2003
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Shaft Zinc

By the way, the 2QM15 has two zincs.
Some say that if you leave the zincs off your shaft and prop you will not have as much marine growth fouling. Let us know.
JohnVT is offline  
Quote Quick Reply Share with Facebook
post #6 of 7 Old 06-11-2005
Junior Member
 
Join Date: Jun 2005
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Shaft Zinc

I own a ''71 Hallberg-Rassy 35, and the space for the zinc is about 1". To complicate matters, the shaft is metric--made in Sweden. I found a Canadian company that supplied metric donut zincs, but they were 1" wide. So I had to take them to a machine shop to have them cut down to 5/8" wide. I got a perfect zinc, but each cut cost me $8, so I added $16 each to the cost of the metric zincs. I have no idea whether I''m saving my shaft on a mooring in Maine, but I figured that it was a small price to avoid having to replace the shaft/prop.

I''ll dive to check mid-season.
darrellt2 is offline  
Quote Quick Reply Share with Facebook
post #7 of 7 Old 06-11-2005
Senior Member
 
Sasha_V's Avatar
 
Join Date: Feb 2004
Posts: 459
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 13
 
Shaft Zinc

Just as a suggestion to that. Wouldn''t it make more sense to buy the zinc that is just shy of 1" wide and with the shaft hole slightly smaller then the metric shaft you have, and then to make a one-off investment in the correct sized metric drill bit?

You do not even need a drill press. The existing hole will pilot the bit nicely. Just drill and then sperate the donut and fit it to the shaft.
The cheapest of cordless drills will do the job.


Sasha
Sasha_V is offline  
Quote Quick Reply Share with Facebook
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









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




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
shaft couplings Stormer Gear & Maintenance 2 05-10-2005 07:53 PM
Lose Zinc nauticalrich Gear & Maintenance 2 11-12-2003 07:12 PM
Shaft Vibration in Forward but not reverse bstrebe Gear & Maintenance 6 10-28-2003 07:17 AM
Motor Shaft Drag furler1 General Discussion (sailing related) 1 05-25-2002 12:30 AM
propellor zinc creek Gear & Maintenance 0 03-20-2001 06:06 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

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