re power, filling old transom holes

[scobar]

I'm in the process of re-powering my 19' Lowe Roughneck boat. I'm thinking that the new motor mount transom holes wont line up with the existing ones. My questions is how to fill the old holes before the new motor is ready to be installed.

thanks for your ideas.

[Iceman]

Scobar;

This is a great time to inspect the transom for rotted wood, hopefully it's all intact.

Maybe 52100 to fill the holes?

Good luck;

 

John

[Shakemsam]

If the transom is all good and no other work is required, go to the lumber yard and get yourself some round hardwood stock just bigger than the holes. Drilling the holes to accommodate the size of stock might be required. Cut them so they will be flush to the outside skins. Coat them with 5200 and drive them in. Sand and paint.

[Sean Youngblood]

https://www.amazon.com/Marine-Tex-RM305K-White-oz/dp/B0014419V0/ref=sr_1_21_mod_primary_new?adgrpid=1346902308081279&hvadid=84181465258655&hvbmt=be&hvdev=c&hvlocphy=164262&hvnetw=o&hvqmt=e&hvtargid=kwd-84181738061086%3Aloc-190&hydadcr=10034_10498159&keywords=marine+tex+epoxy&qid=1647949354&sbo=RZvfv%2F%2FHxDF%2BO5021pAnSA%3D%3D&sr=8-21

[Great_Laker]

I rebuilt the transom and repowered my 19.5' boat with a new outboard this winter as well. Since the 1980s outboard companies use the same bolt patterns on their motor mounts so unless you went with a drastically smaller engine or an engine pre 80s, the pattern should be the same. The only difference will be how high or low they mount the engine based on the shaft length. The standard bolt patterns are 12 7/8" spacing for the top two and 9 7/8" for the bottom two. Your new outboard will match that pattern but i would confirm with the marina installing your new outboard so you don't have to do any more work than you already have to. Replacing the transom is a labor intensive process but if you are spending the money on a brand new outboard it may be worth the investment of time and money so you don't have to do it down the line if you see any rotten wood. Also, some folks use pressure treated wood to rebuild transoms and pressure treated eats aluminum causing it to corrode and pit, If that's what's in your transom now, you want it out before it causes any more issues. Good luck with your repower!

[Prof T]

I went from a 1987 Evinrude 90 to a 2016 Merc 90.....same holes

[tim]

I did the dowels sealant and paint, worked great.

[scobar]

1997 115 johnson to a 2022 140 Suzuki hopefully line up

[scobar]

Great Laker, I did realize that the mounts are standard, my Johnson has the spacing you mentioned, thanks for that info, very helpful!

Scott

[bulletbob]

 I would  use hardwood dowels as the  others, but have found NOTHING as strong  as plain old  JB Weld...Hard as a rock,and seals perfectly.. Paints over easily as well...

[scobar]

thanks for all the suggestion on filling the holes, but as Great Laker said holes are "standard" size, so it's just a drop in install.

 

[East end troller]

Don’t repower. I did that a few years back, boat was awesome for two years but ended up buying new anyways.