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| Calcium Buildup on Mercruiser Outdrive |
| Author |
Message |
    
Bill Shields
New member
Username: swamprat
Post Number: 1
Registered: 08-2009
| | Posted on Sunday, September 06, 2009 - 04:08 pm: | 
|
Gentlemen,
I have excessive calcuim buildup on my outdrive. How do I get rid of it and what can I do to prevent it happening again? |
makomark
Senior Member
Username: makomark
Post Number: 1387
Registered: 09-2008
| | Posted on Sunday, September 06, 2009 - 04:54 pm: |
|
Is it all over or localized?
Fresh or salt water?
Trailered or slipped?
What makes you think it is calcium? |
Bill Shields
New member
Username: swamprat
Post Number: 2
Registered: 08-2009
| | Posted on Sunday, September 06, 2009 - 05:17 pm: |
|
It is all over the drive.
Boat was slipped in fresh water.
The surveyor told me it is calcium.
I just bought this boat last week. |
makomark
Senior Member
Username: makomark
Post Number: 1392
Registered: 09-2008
| | Posted on Monday, September 07, 2009 - 08:23 am: |
|
That's a new one on me....all my time has been in the briney stuff.
did the surveyor offer anything more?
Could have precipitated from the water...could be galvanic but not likely due to fresh water. Did you check with any of the old dock neighbors to see if they are familiar?
You could also try the Mercruiser board on this site....plenty of fresh water operaters there, too. |
W D Neal
Advanced Member
Username: chawk_man
Post Number: 202
Registered: 09-2008
| | Posted on Monday, September 07, 2009 - 09:34 am: |
|
That is strange. I would suspect this boat has either been in salt water at one time or the other and not properly cleaned, OR there was a manufacturers flaw in the initial powder coating process. The typical cure for excessive calcium build up is either straight vinegar or for a stronger brew - a 10% solution of muriatic acid with water. After the muriatic acid has desolved the calcium, thoroughly wash it off of the surface because it will also attack any bare metal. After cleaning off the calcium, closly inspect all the surface and use very fine steel wool to smooth out any lumps or cracks.
At this point, then you should consider re-coating the outdrive. If it is in good shape, consider some sort of polymer clear coating specific for marine environments. Alternatively, consider repainting with anti-fouling metal paint. There are folks on this forum who can give you some good advice on marine metal coatings. I'm not one of them. |
Bill Shields
New member
Username: swamprat
Post Number: 3
Registered: 08-2009
| | Posted on Monday, September 07, 2009 - 10:38 am: |
|
did the surveyor offer anything more?
No nothing useable. I will try the Mercruiser site.
Thanks for the replies. |
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