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last minute advice - cutting transom for tail pipes

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last minute advice - cutting transom for tail pipes

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Old 04-14-2019, 11:24 AM
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Default last minute advice - cutting transom for tail pipes

I am ready to cut. I have mocked up the exhaust and market the cuts on the inside of the transom, found the center and drilled pilot holes all the way through to the outside.

I measured my pilot holes and I am within a 1/16 of being perfectly spaced on either side.

My tail pipes are 4 inch OD where they pass through the transom. I plan on drilling the holes and then putting a couple layers of epoxy on the exposed wood before installing tail pipes.

What size hole saw should I use? I would figure to go about 1/4 inch over size.

I read somewhere to run the drill in reverse until I get through the gel and it will make a nicer cut....is that legit?

Is there a benefit to putting tape around the area where I will be cutting?

My boat is old and nice......I am going to have a bead of sweat on my brow when cutting these holes.

Thanks,
Russ
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Old 04-14-2019, 11:56 AM
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Make sure you tape up the outside of the transom before you start drilling.
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Old 04-14-2019, 12:15 PM
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The tape and running in reverse will help prevent the gel coat from chipping
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Old 04-15-2019, 08:11 AM
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don't know if your home depot has it in stock but i was lucky enough to find a 4-1/8" hole saw by Dewalt there once and snagged it up. I know they carry it online so maybe it was a web purchase return...either way its about perfect for the last set of tips i did on my boat. You have to be careful with the 4-1/4 saw cause it may be very close to the hold down screws for the tips. I know a guy who cut 4-1/4" holes and then the screws kept defecting inwards as they were grabbing the edge of the hole. We ended up making an anchor ring on the back side for longer machine screws to hold onto and he gooped the crap out of the tips to fill the space up between the transom and the tips...
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Old 04-15-2019, 08:16 AM
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Oh..and yes the reverse trick works...and i also tape both sides of transom and do the reverse trick on inner and outer surface....keeps from getting nasty tear-outs on the inside when it breaks through. Have a buddy with a vacuum to get all the fiberglass dust so your less likely to get itchy. And make sure you dont go crazy with the drill speeds as when (not if) the drill grabs and twists around you can hurt yourself pretty bad...I've heard stories of people breaking wrists...and i can say I've almost come close once!
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Old 04-15-2019, 08:22 AM
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Originally Posted by Wally View Post
don't know if your home depot has it in stock but i was lucky enough to find a 4-1/8" hole saw by Dewalt there once and snagged it up. I know they carry it online so maybe it was a web purchase return...either way its about perfect for the last set of tips i did on my boat. You have to be careful with the 4-1/4 saw cause it may be very close to the hold down screws for the tips. I know a guy who cut 4-1/4" holes and then the screws kept defecting inwards as they were grabbing the edge of the hole. We ended up making an anchor ring on the back side for longer machine screws to hold onto and he gooped the crap out of the tips to fill the space up between the transom and the tips...

excellent info, just ordered one from home depot online. thanks!
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Old 04-15-2019, 10:18 AM
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One way i keep from tweeking my wrist is to hold the drill with one hand but press the button with my other. That way when it grabs normally your natural reaction is to grab it,,,,,,,,,, if the hand holding the drill is the one holding the trigger that hurts! When it is the other hand as soon as it grabs your finger comes off the button.
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Old 04-15-2019, 12:13 PM
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Use a hammer drill. I broke my hand a while back when the bit caught, drill went in a circle and BAM. It hurt worse in the doctors off when they reset the break before putting cast on.
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Old 04-15-2019, 12:26 PM
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Have drilled the holes a couple times, and all the folks have good advise. Do use no bigger the 4 1/8. I took an old and a new one and had it welded together so I can cut clean thru

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Old 04-16-2019, 10:14 PM
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Thanks for the advice.

I used a smaller drill that could not hurt my hand or my wrist. I have had that happen so many times I have long lasting soreness in my right wrist.

the little drill **** the bed just at the end of the job.

i was very happy to see my 40 year old transom is dry as a bone.




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