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Author Topic:   "Lining" or Sleeving Holes
Jimm posted 12-29-2002 03:11 PM ET (US)   Profile for Jimm  
I was very fortunate and received a Garmin 240 Blue as a gift on Christmas. In assessing the installation I've only got one question for you good folks. The unit will be mounted on the top of the console of my Montauk 170 and I have to drill at least a 3/4 inch hole for the cable. After drilling the hole is it necessary to "line" the hole with epoxy, some type of fitting or both?
Thanks for all your help in the past year and may the coming year be better for all...Jim
Tom W Clark posted 12-29-2002 03:25 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     

I presume you are asking about waterproofing the hole you need to drill?

If so, the answer is: it's up to you. I think something should be done so you don't just have a big sloppy hole showing, but I would not bother trying to get it perfectly water tight, but you can if you want to.

You may purchase what are called "cord seals" , "coax deck fittings", "cable clams". ect. for anywhere from $5 to $20. You can also use a rubber stopper with a hole drilled through the middle of it for the cable.

But what I like to do and what looks the best is to use a small clam shell ventilator to cover the hole. I use the small Perko model # 315DP1CHR clam shells for this.

An added benefit of this is that you can direct the cable laterally with the clam shell in the direction that is most advantageous for the piece of equipment in question, instead of having the cable just poking out perpendicular to whatever part of the console is being penetrated.

You can then fill the opening of the clam shell with silicone if you want it water tight but I never bothered. If the clam shell is mounted on the vertical face then have the opening facing down. This way water will be less likely to enter and the cable will form a drip loop to prevent water from trickling into the console by traveling along the cable.

dfmcintyre posted 12-29-2002 10:06 PM ET (US)     Profile for dfmcintyre  Send Email to dfmcintyre     
Jim -

Story from another forum member worth repeating. He drilled into the face area of his console, to flush mount some instruments. Found the plywood underneath _water_soaked_, and attributes it to washing around his console panel.

I'd just mix up a small batch of epoxy and use a disposable brush, just to make sure.


doobee posted 12-30-2002 12:24 AM ET (US)     Profile for doobee  Send Email to doobee     
You definitely want to seal the hole. I have mounted a couple of Garmins where I drilled the large hole in the console so it will be hidden under the gimbal mount bracket when it is screwed down. Then I cut a small mouse hole on the back side of bracket base so the cable comes out from under the bracket and there is no visible hole in the console.
triblet posted 12-30-2002 09:49 PM ET (US)     Profile for triblet  Send Email to triblet     
I use the clamshell mounts too. I cut a
piece of rubber gasket material the same
size as the base of the clamshell, and put
it over the wire and under the clamshell.
This helps splashproof it a bit.


bsmotril posted 12-30-2002 11:05 PM ET (US)     Profile for bsmotril  Send Email to bsmotril     
They make plastic cable caps just for such an application. The brand is Capt John's and they can be fount at west marine, Boats USA, Cabelas, etc. The nice thing about using the cap is that is will seal the hole, yet can be easily removed should you need to pull the connector/cable back through the hole.
Dick posted 12-30-2002 11:17 PM ET (US)     Profile for Dick  Send Email to Dick     
I use the Blue Sea cable clams. They are very high quality and look good. They come in several sizes and the hole in the rubber insert can be sized to the wires you are running.
Installation and removal is a snap.


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