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  mounting a 20" shaft motor on 15" transom

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Author Topic:   mounting a 20" shaft motor on 15" transom
gfisher posted 06-28-2001 03:26 PM ET (US)   Profile for gfisher   Send Email to gfisher  
I have been looking back through the forums for a string on this subject. I'm considering the same option since I'm having problems finding a short shaft that I want or can afford for my 13'. Can anyone give me some help?
Wagon1 posted 06-28-2001 07:03 PM ET (US)     Profile for Wagon1  Send Email to Wagon1     
Hi fisher. There is a ton of info on the subject, just look back about a year. I had the same considerations a few months ago. I decided not to use brackets and ordered a Merc 40 short shaft. What I learned the hard way, is that the info on Mercury's web site is WRONG. I assumed I orderd the 2 cylinder, because the web site says that the short is only available in the 2 cylinder. I got a 2002 40 HP 40 short EO 3 cylinder. It is a better engine, but weighs over 200 pounds. I replaced a Johnson 35 that only weighed 130. I runs great, but the boat looks goofy with this huge motor on it.

Do not, however, put a 20 inch shaft on a 72 or older 13, without a bracket. The anti cavitation plate will be way to low, and you will have a ton of resistance in the water. I e.mailed whaler that question and they said "don't do it". Good luck
Mike

L A posted 07-02-2001 12:42 PM ET (US)     Profile for L A  Send Email to L A     
I have a 62 13" with a long shaft 40 Mariner and the solution we used was to 1/4 stainless steel plates, on on the inside and the other on the outside, bolted through the transom. A piece of mahogany was used to fill the space between the two plates, with a third thin plate at the thick part of the transom inside the motor well. The top of the plates is even with the top of the transom and this setup has been rock solid for the past 15 years. The plates did have to be massaged with a maul to fit the curvature of the transom, and the mounting bolts on the bottom went through the bottom engine brackets. So far no problem and if I find a short shaft engine the plates can simply be removed.
andygere posted 07-02-2001 01:30 PM ET (US)     Profile for andygere  Send Email to andygere     
Tohatsu/Nissan make a 40 hp short shaft with electric start, tilt/trim. Lots of info in the performance section of the forum.
WHALERROB posted 07-03-2001 05:43 PM ET (US)     Profile for WHALERROB  Send Email to WHALERROB     
I JUST REPOWERED MY 67 13 FOOT WITH A NEW 2002 25 HP MERC. IT HAS ELECTRIC START ,AN ALTORNATOR, AND IT IS THE 15 IN MODEL. PERFORMACE IS GREAT WITH THIS LIGHT ENGINE.I HAVE NOT CHECKED TOP SPEED YET BUT I WOULD SAY APPROX 30 MPH.

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