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Doral
 BoatUS Boat Groups/Manufacturer Forums>>Doral
Subject Topic: Volvo Penta outdrive corrosion Post ReplyPost New Topic
 
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WCYC Doral
"Seaman Recruit"




Joined: June 30 2009
Posts: 12
Posted: October 21 2010 at 13:00 | IP Logged Quote WCYC Doral

I own a 2003 330SE (Elegante) with twin Volvo Pentas.  Both outdrives have excessive surface corrosion, which includes peeling and chipping paint and pitting of the underlying metal.  No other through-hulls or external or internal metals show evidence of corrosion.  The boat has only been operated in fresh water since new. I owned a 2002 250SE (Monticello) that had the same problem but I never got around to troubleshooting it.  I suspect that possibly the boat has zinc anodes, which are intended for saltwater, as opposed to the magnesium anodes it should have for use in freshwater.  Could this be the cause?  How can I determine if my anodes are zinc or magnesium?  Is there a difference in resistance that I could check with a mulitmeter? Chip some off and see if it burns (an old navy survival vest I used to use included a bar of magnesium intended for this).  I do have a ZINC SAVER system, but I do not know if it is operating or operating properly, which I obviously need to look into as part of the troubleshooting process. Any ideas are much appreciated. 

Thank you,

Sean

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WCYC Doral
"Seaman Recruit"




Joined: June 30 2009
Posts: 12
Posted: October 21 2010 at 15:09 | IP Logged Quote WCYC Doral

For others who might be interested to know more on this Doral anode subject, I contacted Doral directly and got a surprisingly quick reply.  Rejean told me that the outdrives came from the factory with aluminum anodes and that I should change them to magnesium.  It's unfortunate, since the boat was sold new in Williston, Vermont by a dealer who knew the boat would only be operated in fresh water.  Had they installed Mg anodes at the time of commissioning, I assume my outdrives would be in much better condition.
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