short shaft motor on a long shaft transum

Donnie144 · 12 February 2008, 00:04

OK a buddy of mine won a SIB that required a short shaft motor but well that transom latterly fell off the boat. It was replaced with a SIB that needs a long shaft. Any recommendations on how to remedy this problem? My solution was simple and just cut the transom down but for obvious reasons he is a little nervous about this and looking for other options. Nissan doesn’t make a long shaft leg for this motor.

Tim M · 12 February 2008, 00:11

If its a SIB with a wooden transom I wouldn't have any worries cutting it down for a shortshaft. The only problem you are likely to encounter is a bit of water coming over the top if you stop suddently or go in reverse quickly.

jyasaki · 13 February 2008, 17:03

Put the motor on, load up with the most weight in the back that you can ever imagine having, and mark the waterline. That would be the lowest you want to cut.

I wouldn't be too concerned about the cutting down part; it's pretty common to notch the transom for shorter-legged engines. Make sure you radius all the cuts to avoid odd stress points.

jky

Donnie144 · 13 February 2008, 19:15

I’m with you guys cutting it down is by far the easiest a sawzall and hole saw and you could have it done, sanded and sealed in an hour but he just doesn’t want to cut it down so I’m looking for other options. If I can’t talk him into cutting we may just ended welding up an aluminum offset bracket. I was just hoping there was something commercially available.

Limey Linda · 13 February 2008, 20:20

Quote:

Originally Posted by Donnie144

I’m with you guys cutting it down is by far the easiest a sawzall and hole saw and you could have it done, sanded and sealed in an hour but he just doesn’t want to cut it down so I’m looking for other options. If I can’t talk him into cutting we may just ended welding up an aluminum offset bracket. I was just hoping there was something commercially available.

What size engine are you talking about on the SIB ?

Donnie144 · 14 February 2008, 20:30

Quote:

Originally Posted by Limey Linda

What size engine are you talking about on the SIB ?

He's running a 35hp Tohatsu on a 14' Mercury SIB.

Lugnut · 11 June 2008, 23:55

You may have already found a solution but if not...

Would something like this work? http://www.bobsmachine.com/Products/...e_mini-MMJ.cfm