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Date:         Thu, 17 Feb 2000 15:15:45 PST
Reply-To:     Gregg Howald <ghowald@HOTMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Gregg Howald <ghowald@HOTMAIL.COM>
Subject:      Re: Electrolysis and prevention of corrosion:
Comments: To: stuart@cobaltgroup.com
Content-Type: text/plain; format=flowed

I think you are correct that it needs to be grounded to the block. I had the struts deterioriate on an drive leg of an inboard/outboard even though the zinc was present - turned out the zinc wasn't grounded to the struts. However, marine engineers on the list could offer otherwise.

>From: Stuart MacMillan <stuart@cobaltgroup.com> >To: Gregg Howald <ghowald@HOTMAIL.COM> >CC: vanagon@GERRY.VANAGON.COM >Subject: Re: Electrolysis and prevention of corrosion: >Date: Thu, 17 Feb 2000 14:42:00 -0800 > >I am not enough of an expert on electrolysis to know, but it probably >will work. I'm just thinking about how the current might flow in the >damaging electroylsis, and having the zinc electrically attached to the >engine seems like it would make sure that the zinc goes first and not >the case. Pure conjecture on my part, and probably bogus. I think the >best solution is to stop the electrolysis by good grounding and keeping >the highly conductive acids from forming in the first place. > >We need a marine engineer who specializes in this on the list! > >Gregg Howald wrote: > > > > >The zinc should be grounded to the case, and that is how the $50/pair > > >Z-Sticks from FGA work. They are supposed to replace the water jacket > > >drain plugs on each side of the case. Kinda pricey, but probably worth > > >it. > > > > So, are you saying that simply adding zinc to the coolant reservoir is > > inadequate? > > > > >I may experiment with attaching a water heater sacrificial anode to one > > >of the plugs in a core I have. It would be another nice "trick" to >throw > > >at the problem along with using Dexcool. > > > > Why wouldn't the zinc alone do the trick? Seems to work in the marine > > engine environment. > > > > G. > > > > > > > >-- > > >Stuart MacMillan > > >Manager, Case Program > > >800-909-8244 ext. 8208 > > > > > >Getting your share of the Net yet? > > >http://cobaltgroup.com > > >http://UsedEquipNet.com > > > > ______________________________________________________ > > Get Your Private, Free Email at http://www.hotmail.com > >-- >Stuart MacMillan >Manager, Case Program >800-909-8244 ext. 8208 > >Getting your share of the Net yet? >http://cobaltgroup.com >http://UsedEquipNet.com

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