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Author Topic:   Repower for a 68 Nauset HELP!!!
Montana posted 08-08-2002 07:45 PM ET (US)   Profile for Montana   Send Email to Montana  
Ok Iíve done some digging into the past post and Iíve got some questions about mounting a new 90 Merc on to a 68 Nauset. The last motor I had was an 85 Evinrude so the bottom mounting holes are completely different from the bottom mounting holes of the new Merc.

- First from what I can tell the consensus seems to be to mount the engine on the second hole from the top for the upper mounting holes. Does this sound right?

- Second if I do mount the engine using the second hole from the top I wont be able to utilize any of the lower mounting holes as they will be below the bottom of the engine well. The dealer is suggesting drilling new holes in the mounting bracket for the engine. This would put the lower holes in the lower part of the engine well but it would also put the holes in a thinner part of the bracket. He says it will also void my warranty. Obviously this does not sound like a good option.

- Another option would be to install a fixed Jack-Plate like they do on Bass boats. This seems like a better option to me and would allow me to find the best height for the engine. Would this add any more stress to the transom when trailering since the engine is not truly resting on the transom but rather spaced off the transom?

Any thoughts or suggestions would be highly appreciated.

Thanks, Montana

Tom W Clark posted 08-08-2002 08:39 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     

I can think of three options that would still allow you to adjust your motor up and down to whatever "hole" you end up deciding is right for you. I'm not sure if there is a consensus in this issue of vertical adjustment in the case of the 16/17 hull.

1) install a jack plate as you suggest. This will work fine and your boat is plenty strong enough. You may also have the added benefit of increased performance. But you will have the added expense of the bracket itself as well as a small shift in the center of gravity of your boat towards the stern and a corresponding change trim (if the jack plate is also a set back type).

2) Just use lag bolts as Whaler used to suggest for motors in this situation.

3) Do as Bruce Montgomery (beachedwhale) did on his Nauset. (see Cetacea page 53 ) Bruce installed a simple bracket he fabricated that left two bolts sticking out of his transom that are permanent but placed on the BIA standard spacing so they will hopefully work for future motors as well. This option will involve cutting an oblong hole in the splash well for the bracketís installation and then patching it up afterwards. Bruce said this was not a big deal. Itís interesting to note that the dealer (a Whaler dealer) that installed his motor refused to use lag bolts.

JFM posted 08-08-2002 10:23 PM ET (US)     Profile for JFM  Send Email to JFM     

Does your new Merc. have blind bolts? If so you may be able to use them.

My 1964 Nauset has a 1979 Johnson 100. The top holes lined up where the original 1964 Johnson sat, and the bottom holes fit in the well using the blind bolts on the newer motor. The blind bolts are tapped in higher than the bottom bracket starts.

Regards, Jay
P.S. I don't like any kind of mounting below the water line, just my .02.

tully_mars posted 08-09-2002 10:17 AM ET (US)     Profile for tully_mars  Send Email to tully_mars     
Get a Yamaha, the mounting holes match up with the OMC as I am replacing a 1973 115hp on my 72' Nauset/Montauk with a Yamaha 90.

Tully Mars

Montana posted 08-10-2002 09:14 PM ET (US)     Profile for Montana  Send Email to Montana     
Thanks for the replies guys.

Tom, I thank I will go with a fixed jack plate. It seems to be the best option for the situation and your probably right about the added benefits.

I agree with Jay in the fact that I really donít want anything mounted below the waterline and Iím not sure that I like the idea of using lag bolts. I could do like Bruce did but once again that means getting below the waterline and Iíd rather use the old mounting holes if at all possible. Though I must say Bruceís set up is really sweet looking.

Tully, a Yamaha is out of the question. My family has twin 115 Yamahaís on a 24í cuddy cabin. While they are ok engines we can never seem to find parts for the things or get good service on them. It seems like the dealer never stocks anything so everything has to be ordered. Then half the time the parts are back ordered and we have to wait. Thatís too much of pain.

Thanks, Montana

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