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Old 09-12-2011, 10:35 PM   #1
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Default white film, chalky residue?

Cleaning things up while re-installing everything... I noticed some white film, chalky residue on the out drive (alpha one). Might just be hard water deposits and CLR does get it off..... Don't think the outdrive is getting hot. Wondering if everyone see this or just me?
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Old 09-13-2011, 12:02 AM   #2
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salt water or fresh water boat? May be dry salt if salt water.
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Old 09-13-2011, 12:18 AM   #3
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Fresh only....
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Old 09-13-2011, 12:31 AM   #4
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does it look like this? http://forums.iboats.com/showthread.php?t=472946
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Old 09-13-2011, 12:40 AM   #5
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More this this...... yes this is mine.... Judging by the lack of residue where the hydraulic trim cylinders are I'm going to go with exhaust residue.





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Old 09-13-2011, 03:56 AM   #6
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I have always been told that they will do that if they get too warm. Might want to check into a drive shower like one of these- www.driveshowers.com
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Old 09-13-2011, 11:45 PM   #7
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Geeez 200.00 bucks for a tube with holes in it? This is my next project and I bet I can make the exact same thing for 20 bucks. Will post pics when done
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Old 09-14-2011, 01:11 AM   #8
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Sorry, gotta ask the obvious here. Why not look into why it is running that hot (if that is indeed what is causing it)? Is it caused by warm water and long runs? Do you have the wrong stat in it (mine uses 160 deg)? Could you be losing cooling water into the bilge?
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Old 09-14-2011, 01:28 AM   #9
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No loss of water, think it just might be the river here... this is my forth alpha drive and they have all done that. White residue on automotive exhaust tips is considered good, I.E. it's not running rich or lean. I truly believe this has much more to do with exhaust than it does with heat.....everything I'm reading says otherwise though.... I will build the shower though.. just because I can.
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Old 09-14-2011, 02:44 AM   #10
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Quote:
Originally Posted by oneradride View Post
I will build the shower though.. just because I can.
NICE
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Old 09-14-2011, 01:30 PM   #11
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Quote:
Originally Posted by oneradride View Post
I will build the shower though.. just because I can.
Show off.

Interestingly ORR, it all seems to be on the upper portion of the drive - the part that is out of the water when running. And doesn't the exhaust exit the A1 drive from the lower section? Regardless, with your crazy mad fab skillz (wish I was so talented) you can make a shower, clean the gunk off the drive, and give it a go.

Or just run it with the side exhausts open all the time!

Dan
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Old 09-15-2011, 02:05 AM   #12
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Not too crazy.... I just like so save money and have put together a few cool things.....
The Alpha exhaust exits though the prop and on both sides of the trim cylinders as seen here at about 2:46..... Above the cavitation plate....
You are right though.... when in the water.... with the Corsa/captains call open. the back pressure from the lake or river will force most of that out the sides..
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Old 09-15-2011, 12:49 PM   #13
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On my Bravo III, the raw water discharge comes out of the transom collar, not the drive. Do teh Alpha's exhaust through teh drive itself? It was also my understanding that the raw water intake is what cools the drive, not the exhaust. Did you bypass the raw water intake on teh drive with a through hull and remote water pump? If so, then the drive would no longer be getting cooled. If you went with a through-hull running pickup and a remote water pump, then you would NEED to install a drive shower to keep the top end of the drive cool.

It's also my understanding that the chalky buildup on the top end of the drive is typically indicative of overheating. Just a couple of thoughts.
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