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Old 25-07-2016, 07:58   #1
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Lower Unit "Growths"

I have purchased a Chris Craft 328 with Volvo Duo Drives that has been in the water for 16 years with the exception of pulling it for hull painting and lower unit service. (Lube and new bellows). The units have what appears to be mineral growth on them. I have tried using a scrub brush to remove this with limited success. I know it isn't that big a deal to have them pristine, but I would like them to look better. I was just told to use scotchbrite pads on the stainless props. Anyone have any idea what to use on the lower units?

Thanks,

Frank
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Old 25-07-2016, 07:59   #2
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Re: Lower Unit "Growths"

A scraper, no really, go to a paint store and buy a scraper.
Is the boat out of the water?
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Old 25-07-2016, 08:17   #3
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Re: Lower Unit "Growths"

Get the plastic scrapers, putty knives from a home depot. I would not use the metal scrappers as they might gouge the surface.

Also might try Magic Eraser but be careful and try it in a area out of site to test. I used Magic Eraser with mixed success cleaning fiberglass. I put scuff marks in the surface that I had to buff out. I think the key is to press lightly.

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Old 25-07-2016, 08:21   #4
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Re: Lower Unit "Growths"

The best tool for removing barnacle rings and mineral deposits is an osculating multi tool with a scraper blade attached. They will make quick work of it.

You can see before and after photos of my wing engine propeller cleaned up using the tool above here.
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Old 25-07-2016, 08:50   #5
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Re: Lower Unit "Growths"

The issue is the boat is in the water. Thanks...any more ideas?
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Old 25-07-2016, 08:51   #6
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Re: Lower Unit "Growths"

It is still in the water...and I dont want to pull it just for this. Ideas..??
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Old 25-07-2016, 08:53   #7
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Re: Lower Unit "Growths"

The magic erasers worked great on the Spider Crap from the docks as well as scuffs.
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Old 25-07-2016, 08:56   #8
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Re: Lower Unit "Growths"

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It is still in the water...and I dont want to pull it just for this. Ideas..??

They make an underwater version that is called the waveblade, but it is expensive ($300). Might be cheaper to just pull the boat and get it cleaned and painted.
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Old 25-07-2016, 09:05   #9
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Re: Lower Unit "Growths"

Thanks for the advice and the pic references. I just had this thing out of the water and i will have to wait a while to do it again as it isn't cheap here to pull one. Thanks SO much.
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Old 25-07-2016, 19:39   #10
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Re: Lower Unit "Growths"

Are you sure those 'bumps' aren't electrolysis? Sometimes different boats in adjacent slips can increase the stray current flow.


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Old 25-07-2016, 19:40   #11
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Re: Lower Unit "Growths"

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Are you sure those 'bumps' aren't electrolysis? Sometimes different boats in adjacent slips can increase the stray current flow.


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Old 26-07-2016, 05:26   #12
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Re: Lower Unit "Growths"

No, I am not sure. That said I looked at the anodes on the lower units and the hull and they look pretty good.
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