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Replacing anodes ?
https://www.smwebhead.com/phpBB3/viewtopic.php?f=3&t=7169		 Page 1 of 1
Author:  SeriousRob [ Wed Mar 16, 2011 3:16 pm ]
Post subject:  Replacing anodes ?
I found this image from boatzincs.com. It shows the VP SX outdrive anodes.
http://www.boatzincs.com/pdfs/volvo_pen ... lation.pdf
The transom anode looks straightforward but do I have to split the outdrive to get to the gimbal anode?
Thanks for the help
Rob
Author:  Paul I. [ Wed Mar 16, 2011 3:56 pm ]
Post subject:  Re: Replacing anodes ?
No, you don't!! Thats the bottom of the drive.

To me at lest, that pic looks like a Merc drive. But I am not up on Volvos.
Author:  Graham R [ Wed Mar 16, 2011 5:28 pm ]
Post subject:  Re: Replacing anodes ?
Odd choice of descriptions; one is on the transom shield (the trapesoidal one), the other is on the outdrive. Both removeable with no additional dismantling. Bear in mind the transom anode may actually be 2 anodes depending on the transom assembly ( SX/ SX-MHP).

Graham
Author:  SeriousRob [ Thu Mar 17, 2011 7:05 am ]
Post subject:  Re: Replacing anodes ?
Thanks,
I removed the anodes when I got home last night. They were both easy to get to and held on by two bolts each. The gimbal anode was underneath the outdrive and easily accessible. The gimbal anode appeared to have been working as it had surface corrosion all over it but had not been eaten away. The transom anode looked like new and that is where I had been getting most of my corrosion. I could not find a part number on the gimbal anode but the transome anode had 3855411 stamped on it.
According to BoatWorks.com that corresponds to zinc and would explain why my outdrive suffered some corrosion while in freshwater up in Maine last summer.
I plan on buying a set of magnesium anodes to swap out prior to heading to Maine this summer.
Take care
I know you guys like photos so here is one of my boat at sunset in Maine last summer.
Rob
Image
Author:  SeriousRob [ Thu Mar 17, 2011 7:07 am ]
Post subject:  Re: Replacing anodes ?
Here is what the anodes looked like on my VP SX. This image is from boatworks.com
Image
They are actually called the transom and gimbal anodes.
Rob
Author:  Obie [ Fri Mar 18, 2011 5:48 pm ]
Post subject:  Re: Replacing anodes ?
If you boat in fresh water you should consider replacing the zinc anodes with magnesium anodes. They are more reactive and provide greater protection in fresh water.
Author:  SeriousRob [ Sat Mar 19, 2011 7:17 am ]
Post subject:  Re: Replacing anodes ?
Exactly,
I ordered the magnesium anodes so I can swap them out prior to heading to Maine and freshwater in July. Here in Florida I boat in the Indian River which is considered brackish but is very close to saltwater in salinity so I use zinc there. Since it is easy to swap the anodes I will now carry both magnesium and zinc.
Take care
Rob
Author:  LouC [ Sat Mar 19, 2011 7:31 am ]
Post subject:  Re: Replacing anodes ?
Put a little marine grease on the threads of the bolts, so they do not seize in place, I leave my boat in salt water for 6 months out of the year and the bolts always come out....
Author:  PDACPA [ Tue Mar 22, 2011 5:23 pm ]
Post subject:  Re: Replacing anodes ?
How often (or when) should you replace them? I need to go look at mine, but not sure I had noticed any issues. My boat is on a trailer in a garage when not being used.
Author:  Cap'n Morgan [ Tue Mar 22, 2011 6:00 pm ]
Post subject:  Re: Replacing anodes ?
When the anodes are close to 50% depleted, replace them.
Author:  Obie [ Tue Mar 22, 2011 11:00 pm ]
Post subject:  Re: Replacing anodes ?
Anodes can also get a chalky white oxide coating on them. I like to hit them with sandpaper every spring to be sure they are ready for the water.
Author:  Thalasso [ Thu Mar 24, 2011 12:36 pm ]
Post subject:  Re: Replacing anodes ?
SeriousRob wrote:
Exactly,
I ordered the magnesium anodes so I can swap them out prior to heading to Maine and freshwater in July. Here in Florida I boat in the Indian River which is considered brackish but is very close to saltwater in salinity so I use zinc there. Since it is easy to swap the anodes I will now carry both magnesium and zinc.
Take care
Rob



If you are boating in brackish water you should be using aluminum, not zinc.
Author:  SeriousRob [ Thu Mar 24, 2011 12:53 pm ]
Post subject:  Re: Replacing anodes ?
I checked the salinity maps of the Northern Indian River Lagoon where I do my Florida boating. With sea water at 35 ppt as a reference the lagoon varies from a low of 20 ppt in the rainy season to near 35 ppt in the dryer season. So, if you were boating in this area would you use zinc or aluminum anodes? Are there any downsides to the choice?
Thanks Rob
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