Zinc or Aluminium anodes for Bravo III drives?

[stefan_r]

I have had a look on the MG Duff site and I have a choice of zinc or aluminium.

Boat is in Burnham-on-Crouch and Duff site says zinc or aluminium for "saltwater" and/or "saltwater & brackish".

Any ideas???

 

[DAVIDO]

More informed members will understand the technicalities better than i but my understanding is;
Aluminium - Brackish Water
Zinc - Salt Water
Magnesium - Fresh Water

 

[macd]

Have you had zincs on her before? if so, what's their appearance? If they're encrusted with a crumbly white oxide deposit, it probably means the water's too brackish for them to work -- and unless cleaned up they'll still be ineffective even if returned to full salt water. In that case, aluminium would be indicated since it works in both brackish and seawater. But if the zincs have been working, there's probably no reason to change.
The MG Duff site (www.mgduff.com/leisure-craft/cathodic-protection.html) gives chapter and verse.

 

[stefan_r]

new boat to me, unfortunately...

Got aluminium on at the moment and I am wondering when/how I can tell if that's okay....

 

[macd]

Ally should work and is presumably there for a reason. What are other boats in the locality using, and what's the state of theirs?
Is there anything about the Bravo drive that precludes using aluminium anodes?

 

[BrendanS]

Mercruiser drives now come delivered with aluminium anodes instead of zinc, due to corrosion problems. Probably better to stick with aluminium

 

[duncan]

1. Merc only make aluminium ones for the BIII
2. The price of a kit has actually fallen significantly last year
3. Some muppet mechanic thought he was doing me a favour andinstalled key part copies on my BIII 4 years ago and it melted in 6 weeks (anodes however were imaculate). This is not meant as any critism of MG Duff - they are acknowleded experts.

Co incidentially I picked up a kit today as I poped into Boaters world ..........$54! If only. Sod's law they only had the one kit too.

 

[stefan_r]

[ QUOTE ]

Co incidentially I picked up a kit today as I poped into Boaters world ..........$54! If only. Sod's law they only had the one kit too.

[/ QUOTE ]

Just bought a kit online $71/£40 inc P&P...different world in the US!!!!

 

[Alrob]

just fitted new anodes on B3 yesterday

I was informed by mercury dealer that I had to fit mercruiser parts for warranty also as others said mercruiser only do ali anodes now (cost £82.00inc vat local dealer)
took 15 mins to do job

cheers