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Drilling the hull
NRath
Member Posts: 135 ✭✭
#1 When drilling holes in the hull/transom for screws, mounting trim tabs in my case, would it be ideal to drill the holes, then hit them with a countersink to break over the sharp edge? I'm thinking this would reduce or eliminate spider cracks radiating out of the hole. Or, is it not necessary?
#2 "Marine Sealant"... Is this just 100% silicone, or is there something unique about it? Just wanting to see if I need to make a trip for something special.
Any other tips are welcome! I'm a wee bit OCD and don't mind going extreme to do it right.
Thanks!
#2 "Marine Sealant"... Is this just 100% silicone, or is there something unique about it? Just wanting to see if I need to make a trip for something special.
Any other tips are welcome! I'm a wee bit OCD and don't mind going extreme to do it right.
Thanks!
Comments
For at least ten minutes I stared at my marks on the transom, carefully measured and drawn- then measured again.... x at least 10, in order to buy me more time before doing the inevitable...
then I held the drill bit to the marks, finger on trigger of drill, but my finger disobeyed my brains orders and just wouldn't squeeze... so I do what I always do in circumstances like these, and used it as an excuse to pour beer on it... which had the side affect of questioning my judgement under the influence, which caused a ten minute job to extend over two days... the next day, there I sat.... drill in hand bit aligned to marks.....
in the end, my finger relented and the remaining five holes took less than a minute....
so.. anyway: mark your drill bit.. use tape, paint, whatever- choose how deep you're going and don't go beyond that. use marine sealant.. 4200 by 3M is the item of choice- 5200 is too much, and those brackets will become permanent fixtures on your transom or there will be huge chunks of fiberglass missing from where they once were... fill the hole with the 4200, and dip the screw in it- wipe excess away.
No need to attempt countersinking... the bolts should be an acorn bottom flat top fitting nicely against the trim tab brackets with only the shaft of the screw inside the taps you just created.
2007 280 Rinker Express 6.2L B3
Go Steelers!!!
So, option to remove leaves me at 4200??
Go Steelers!!!
When drilling into gel coat I always use a counter sink bit made for gel coat or a spin the "normal" bit in reverse. Holes in gel coat that have not been counter sunk have a high probability of spider cracking. I agree that allowing a variable speed drill to rotate the bit too slowly can cause chunks of material , in this case gel coat, to be broken loose as a sharp bit with bite in and pull up at slow speeds. 1000 +/- rpm with a light but steady touch has always worked for me. I have seen too many cracked holes to count from a lack of counter sinking and overthigtening.
We're off to the races!
Once committed, it wasn't a bad job. More time was spent marking the holes and confirming symmetry than was spent with the drill spinning. The speedo sensor caused some headache on the starboard side. As-is, its dead against the trimtab, actually had to file off a little plastic.
Here's an example of screws without a countersink, and how not to work on a boat hull. There are actually 3 holes at the btm left mount point, one is filled with sealant. Given the dash has a speedo, I assume this was factory work:
Thanks for the heads up on countersinking! These were #14 screws, so I started with a center punch, then 1/8" pilot hole, countersunk that, then went to ???. Nauticus said to use a 7/32, but that was almost a clearance hole, so I went a little smaller.
Beautiful job NR! :-) Great pics of how not to (by someone else) and how to (your job) prep the holes.
I remember the first time we put "big" holes in the hull of one of my boats - for through hull exhausts. It was done on a 1994 Rinker 190 in 1998. I had put a 390 HP 383 in it and was installing 4" Corsa Captain's Call switchable through hull exhausts. That was my first experience drilling a big hole in a Rinker hull. A marina tech at the dealer and I did the job. We must have measured it 10 times LOL. There were a crowd of guys around - NO one who saw the result ever doubted how Rinker makes a hull!!!!! We burned out two sets of brushes in a 1 3/4 HP shop drill. The darned drill was smoking! The dealer asked to keep one of the plugs to display to customers. Those Rinker transoms are way beyond strong. I drilled a lot of big holes in hulls since then helping other guys but I have never seen a layup like in that low priced Rinker hull - even in boats costing 5 times its price. THAT sealed the deal for me regarding the toughness of Rinkers. I just received an e.mail from the third owner of that boat a few days ago and that hull is still going strong.....a hull designed for either the standard 3.0 L or the "big" 4.3 LX has ben handling all that torque and HP for 18 years. That's a Rinker.
I noticed on my previous 192 that the black/off white color split was way off; might be the same in your case. It's too hard to tell from the photo.
For even better performance, you may want to look at a cupped stainless prop.
Great job though....you'll love the tabs.
Mark
2019 MTX20 Extreme
Mark
2019 MTX20 Extreme
Being a newbie, I didn't want to dig too deep for a prop until I was comfortable with what I wanted. The Solas 4 pedal AL was only $120 shipped. I'm usually not one to replace something until it's broke, so we'll see how it goes. I read that "cupped" is a feature that's on the trailing edge of the prop. A smallish 1/4 - 1/2" of the prop flaring upward increasing the angle of the pedal. The stock V-P 3 pedal and the new Solas both have this. I should do a little more reading on this.
Interestingly, almost every detail of the V-P prop is identical to the Solas. Are they manufactured by Solas for V-P?
http://rinkerboats.vanillaforums.com/discussion/3947/time-to-plane#latest
The short story is 2 thumbs up!
http://rinkerboats.vanillaforums.com/discussion/3947/time-to-plane#latest
The short story is 2 thumbs up!