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Old 08-05-2014, 09:18   #1
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Thrugh-hull drill size

Grocco installation says
STEP-1: Cut a hole through the hull
and backing block slightly larger than
the thru-hull fitting OD....

What is slightly larger?
I have an old datamarine transducer hole that is 2-1/16" in diameter. I want to put a 1-1/2" bronze grocco scoop strainer. Grocco does not say what it's OD is. any info on that would be great. I looked up the OD on a 1-1/2" NPS pipe, and it says 1.9".
So my question is....is 2-1/16 slightly larger or too big in comparison to 1.9"?
Thanks
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Old 08-05-2014, 10:34   #2
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Re: Thrugh-hull drill size

5200 will fix that. If my math is correct, that's only like .0080 on each side.
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Old 09-05-2014, 11:40   #3
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Re: Thrugh-hull drill size

Its actually 80 mils or 0.08". which translates to 40mils or 0.04" void around the through hull.
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Old 09-05-2014, 11:53   #4
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Re: Thrugh-hull drill size

Quote:
Originally Posted by phorvati View Post
Its actually 80 mils or 0.08". which translates to 40mils or 0.04" void around the through hull.
Dang! an extra 0. I still don't think there is a problem.
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Old 13-05-2014, 07:55   #5
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Re: Thrugh-hull drill size

After further inspection I had a bigger problem. 5200 was used to fill a void created after removing balsa around the hole in the sandwich structure. after I took that out, I had no choice but to pour thickened epoxy. i waxed a 1-1/2" fitting and left it in there, then poured epoxy in the void and gap. Now the hole is snug with the fitting and there are no voids in the walls. Everything filled quite nicely.
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