Reply
 
Thread Tools Search this Thread
 
Old 15 April 2017, 21:19   #1
Member
 
Country: UK - Scotland
Town: dundee
Boat name: slimyseal
Make: avon
Length: 5m +
Engine: merc 60
Join Date: May 2015
Posts: 13
Anodes

Hi there,
just wondering if anybody knows the cheapest source to get zinc anodes for 2002 merc 60hp fourstroke. Found anodesdirect, but out of stock,seems a bit harder to get when they are not top dollar.Any help appreciated.
Regards
__________________
captain birdseye is offline   Reply With Quote
Old 15 April 2017, 21:36   #2
RIBnet Supporter
 
willk's Avatar
 
Country: Ireland
Length: 4m +
Join Date: Feb 2008
Posts: 14,664
I corrode more anodes than anyone I know and I've spent a lot of time searching for bargains. I'd say beware the cheap stuff and go the extra few quid for the real deal. There's a lot of stuff about that look like anodes but aren't what you really need. I mean - "freshwater anodes", srsly?
__________________
I'm sorry, but there IS no Mars Bar.
willk is offline   Reply With Quote
Old 15 April 2017, 21:46   #3
Member
 
Country: UK - Scotland
Town: dundee
Boat name: slimyseal
Make: avon
Length: 5m +
Engine: merc 60
Join Date: May 2015
Posts: 13
anodes

Cheers for the reply willks. may I ask where you source your anodes from , that's interesting that the cheaper ones don't do the job , would you say its because they are not actually made of zinc? I toyed with the idea of copying the dimensions and having the local blacksmith knock them up.
__________________
captain birdseye is offline   Reply With Quote
Old 15 April 2017, 22:02   #4
RIBnet Supporter
 
willk's Avatar
 
Country: Ireland
Length: 4m +
Join Date: Feb 2008
Posts: 14,664
Quote:
Originally Posted by captain birdseye View Post
Cheers for the reply willks. may I ask where you source your anodes from , that's interesting that the cheaper ones don't do the job , would you say its because they are not actually made of zinc? I toyed with the idea of copying the dimensions and having the local blacksmith knock them up.
I think what I'm saying is that not all anodes are born equal. They aren't the biggest annual cost and yet they have the potential to cost you big money if they fail to be the weakest link. I've seen pukka anodes fail to work because they were a slightly different composition to the others on the engine. My final position is to run "original part" anodes where there are a number of them working in together to provide protection - i.e. on an OBM.
__________________
I'm sorry, but there IS no Mars Bar.
willk is offline   Reply With Quote
Old 15 April 2017, 22:23   #5
Member
 
Pikey Dave's Avatar
 
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 11,861
RIBase
You also need to check your installation for current leakage. Proper isolation is crucial
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4:Don't feed the troll
Pikey Dave is offline   Reply With Quote
Old 16 April 2017, 15:35   #6
Member
 
Country: UK - England
Town: Waterlooville
Boat name: Tickler
Make: Halmatic P22
Length: 6m +
Engine: Inboard Diesel 240HP
MMSI: 235115642
Join Date: Sep 2015
Posts: 1,777
RIBase
I have bought chunks of zinc anode from Ebay. One of the bits had part of MG Duff cast in it so unless the seller was being very clever, it was probably of reasonable quality.

I then cut it in to the required shape - which was hard work with a hacksaw. This is probably alright with rectangular shapes but less so with complicated shapes.

Freshwater anodes - these tend to be magnesium as they are as they are about as anodic as you can get but don't fur up like zinc anodes in fresh water. You could use magnesium anodes in salt water but they would almost fizz away in front of your eyes.

Interestingly (possibly), we have just asked MG Duff to specify some anodes for a seagoing steel ship and they have specified aluminium anodes. When I questioned this, they said they were shifting all their commercial customers towards aluminium anodes rather than zinc.

To add to PD's comment, one of the key things is to make sure there is no resistance between the anode and the thing you are trying to protect (before the boat is in the water). Sorry to go off topic.
__________________
GuyC is offline   Reply With Quote
Old 17 April 2017, 00:10   #7
Member
 
Country: Australia
Town: Dalmeny
Make: zodiac
Length: 5m +
Engine: outboard
Join Date: May 2015
Posts: 1,200
Don't forget to cheack the powerhead anodes, theses are often small and on the back of stainless bolts in the powerhead. Being small and constantly part of the saltwater cooling system they need changing more often, something many home service handymen forget.
__________________
jonp is offline   Reply With Quote
Old 17 April 2017, 09:43   #8
Member
 
Pikey Dave's Avatar
 
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 11,861
RIBase
Quote:
Originally Posted by GuyC View Post
.......Interestingly (possibly), we have just asked MG Duff to specify some anodes for a seagoing steel ship and they have specified aluminium anodes. When I questioned this, they said they were shifting all their commercial customers towards aluminium anodes rather than zinc.


[emoji106]We've been fitting Ally MG Duff anodes to machines destined for saltwater use for some years now, just as effective, cheaper & MUCH lighter & easier to handle. This is to stainless machines for saltwater use. I don't know how the chemistry would work with fitting Ally anodes to Ally outboards though.
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4:Don't feed the troll
Pikey Dave is offline   Reply With Quote
Old 17 April 2017, 10:05   #9
Member
 
Maximus's Avatar
 
Country: UK - England
Town: Wild West
Boat name: No Boat
Make: No Boat
Length: under 3m
Join Date: Jan 2008
Posts: 5,305
Send a message via AIM to Maximus
Quote:
Originally Posted by jonp View Post
Don't forget to cheack the powerhead anodes, theses are often small and on the back of stainless bolts in the powerhead. Being small and constantly part of the saltwater cooling system they need changing more often, something many home service handymen forget.
Yep that's the ones that'll come back to bite you...if you miss em!!
__________________
A clever Man learns by his mistakes..
A Wise Man learns by other people's!

The Road to HELL ..is Paved with "Good inventions!"
Maximus is offline   Reply With Quote
Old 17 April 2017, 10:51   #10
RIBnet admin team
 
Poly's Avatar
 
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: Tohatsu 30HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 11,622
Quote:
Originally Posted by Pikey Dave View Post
I don't know how the chemistry would work with fitting Ally anodes to Ally outboards though.
it won't.
__________________
Poly is offline   Reply With Quote
Old 17 April 2017, 10:56   #11
Member
 
Pikey Dave's Avatar
 
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 11,861
RIBase
Quote:
Originally Posted by Poly View Post
it won't.


Didn't think it would, you'd need something more reactive than the ally engine. That's assuming that the engine is pure ally & not a less reactive alloy. The ally anodes are for all intents are "pure".
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4:Don't feed the troll
Pikey Dave is offline   Reply With Quote
Old 17 April 2017, 12:52   #12
Member
 
Country: UK - Scotland
Town: north ayrshire
Boat name: charlie girl
Make: S/R5.4/regal3760
Length: 10m +
Engine: Suzukidf70 2x6lp 315
Join Date: Jul 2009
Posts: 3,716
All the new mercruiser bravo anodes are manufactured from aluminium
I assume a poorer grade than the drives
__________________
beamishken is offline   Reply With Quote
Old 17 April 2017, 15:18   #13
Member
 
Pikey Dave's Avatar
 
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 11,861
RIBase
Quote:
Originally Posted by beamishken View Post
All the new mercruiser bravo anodes are manufactured from aluminium
I assume a poorer grade than the drives


I'm guessing (& am willing to be corrected) that the opposite is true, high purity Ally will be more reactive than the alloy used for the engines, so will sacrifice more readily.
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4:Don't feed the troll
Pikey Dave is offline   Reply With Quote
Old 17 April 2017, 15:37   #14
RIBnet admin team
 
Poly's Avatar
 
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: Tohatsu 30HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 11,622
Quote:
Originally Posted by beamishken View Post
All the new mercruiser bravo anodes are manufactured from aluminium
I assume a poorer grade than the drives
A quick google suggests its an aluminium-indium alloy (which is more reactive than the alloy used in the engine/leg).
__________________
Poly is offline   Reply With Quote
Old 17 April 2017, 18:21   #15
Member
 
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Excel 435
Length: 4m +
Engine: Suzuki Outboard/25/4
Join Date: Oct 2011
Posts: 7,441
RIBase
https://chem.libretexts.org/Core/Ana...rificial_Anode

For info
__________________
jeffstevens763@g is offline   Reply With Quote
Old 17 April 2017, 19:48   #16
RIBnet Supporter
 
willk's Avatar
 
Country: Ireland
Length: 4m +
Join Date: Feb 2008
Posts: 14,664
Quote:
Originally Posted by Poly View Post
A quick google suggests its an aluminium-indium alloy (which is more reactive than the alloy used in the engine/leg).
Yeah. Right. And when someone slips a pair into yer Yanmar service pack - they sit there, unsullied, the anode equivalent of Highlander, living forever....



It's all about the aluminium now tho.
__________________
I'm sorry, but there IS no Mars Bar.
willk is offline   Reply With Quote
Old 22 April 2017, 18:35   #17
Member
 
Country: UK - Scotland
Town: dundee
Boat name: slimyseal
Make: avon
Length: 5m +
Engine: merc 60
Join Date: May 2015
Posts: 13
anodes

Plenty info there to keep me buried online.Will check the power head ones though ,that one escaped me . Just ordered the two wedges and the flat plate in zinc for £45 , so we will see how it pans out. Cheers lads
Regards
__________________
captain birdseye is offline   Reply With Quote
Old 22 May 2017, 18:42   #18
Member
 
Country: UK - Scotland
Town: north ayrshire
Boat name: charlie girl
Make: S/R5.4/regal3760
Length: 10m +
Engine: Suzukidf70 2x6lp 315
Join Date: Jul 2009
Posts: 3,716
Finally got round to servicing the hard boat to go in the water later in the week and took these aluminium anodes off which as you can see have been doing their job
Boat was sat on the mooring for 6 months apart from a few overnights in marinas.
There seemed to be some doubt as to whether they would corrode before the drives but clearly they do Click image for larger version

Name:	20170522_164022.jpg
Views:	138
Size:	137.5 KB
ID:	119595
__________________
beamishken is offline   Reply With Quote
Old 22 May 2017, 18:51   #19
Member
 
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Excel 435
Length: 4m +
Engine: Suzuki Outboard/25/4
Join Date: Oct 2011
Posts: 7,441
RIBase
Quote:
Originally Posted by beamishken View Post
Finally got round to servicing the hard boat to go in the water later in the week and took these aluminium anodes off which as you can see have been doing their job
Boat was sat on the mooring for 6 months apart from a few overnights in marinas.
There seemed to be some doubt as to whether they would corrode before the drives but clearly they do Attachment 119595
Bang on them classic protection
__________________
jeffstevens763@g is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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




All times are GMT. The time now is 05:58.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.