Zink or not?

[belliswood]

I have a 1996 370 sundancer and I am going to order new zinks for it and was looking at what I need. When inspecting the drive gear I noticed that there are no shaft zinks. Since they are SS shafts do they still need the zinks? When inspecting I also noticed that the rudders have no zinks on them but also there are no holes where any may have been, is this normal?

Are there any engine zinks I need to order? I have the 7.4 MPI/EFI engines.


Thanks for your Help..

Barry

 

[northern]

I put two diver zincs on the back, two on each shaft, one on each trim tabs and one in each engine including the generator. No idea if this is too much but so far I have not had any problems. They are changed each spring and by the following spring the shaft ones are 80% gone, one diver zinc is gone, the tab ones are 50% gone and the pencil ones in the engines are gone. I put new ones in the engines evey 100 hours or every 3 months during running season.
The only zincs I change in the engine are in the heat exchangers.

 

[belliswood]

I have zinks on each trim tab, on each water intake covers on the underside of the boat and 1 large hull zink. I will check the ones for the engine heat exchanger and also the generator and put them on the SS shafts. Are there any for the A/C units?

Thanks
Barry

 

[northern]

I have never looked on the AC but good point. May be some one knows.

 

[trit21]

You need to go to http://boatzincs.com/ and read why your should not put 'too much' zinc on your boat. Yes, you can have too much and it will start to pit the stainless, kind of like a reverse effect. But read it on the site and make your own analysis. As far as shaft zincs, if you shafts are internally bonded through the transmission (which many SeaRays are from what I have been told) you don't need shaft zincs. Again, too much zinc is not good. AC zincs? Never heard of them. Zincs on the intakes, never heard of that either as these are all internally bonded to the bonding system and that is what the hull zinc is for. But verify bonding and amount of zinc needed.

 

[Jimmy Buoy]

Mine has one anode on each trim tab and a larger one on the transom between the prop pockets. None on the shafts. Magnesium/Aluminum anodes are used since I boat in fresh water.

 

[belliswood]

Thanks guys for the info you have been very helpfull.

Barry

 

[Alex F]

My 320DA and 420DB never had shaft zincs. I can't be 100% sure if they come from the factory like that or PO just never changed them. IMO, they were not installed as they're not required due to the bonding system SR makes. Having said that I never installed one either and so far so good. One thing I never like about shaft zincs is when they take off on you. There's a good chance of the hull and/or prop damage. So, this means you always have to baby-sit them. I dive periodically under to keep an eye on things, but I just don't wish to have another headache if I don't have to.

My suggestion is to determine what type of bonding system you have and you can always call/email SR for verification whether you need the zincs on your boat.

 

[belliswood]

Again thanks for all the input. You were very helpfull............

 

[rcknecht]

I put shaft zincs on my boat, even though it is not required. I have a zinc on each trim tab, the hull zinc, and the genny HE zinc. This past sping the marina painting my boat put additional zincs on the bolts that attached the trim actuator the tab. In salt walter it is hard to have too much zinc. Where you boat, the water is less salty, so I would be less likely to use shaft zincs....