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 Shimming a motor on a transom??'s 
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Post Shimming a motor on a transom??'s
So I bought a 35 gtr a couple weeks ago and before I could try it out I had to build my transom back up to a tall transom. When I finally got it in the water I noticed the water would hit the front of the belt housing and splash straight up on to the back of the motor and plastic clutch housing. I tried moving the bolt to change the angle of the motor and it seems to be best at the top hole but does not fix the problem. I measured the transom and it is almost 20" but not quit. So I was wondering if anyone has shimmed a motor on the transom about an inch or so? The boat is a 16×48 weld bilt, I know it's not the best but that's all i have to work with for now. Thanks for any help.

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1648 weld bilt being followed by a 35 gtr


Mon Apr 07, 2014 7:33 am
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Post Re: Shimming a motor on a transom??'s
Are you measuring 20" by hanging a tape straight up and down on the transom, and meeting up with a straight edge off the bottom of the boat?

You need to get it up to 21". I dont see a problem with shimming it, just bolt that sucker down good. My buddy had his MB shimmed up like that for a long time without any issues.


Mon Apr 07, 2014 7:46 am
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Post Re: Shimming a motor on a transom??'s
Yea, it's not the surface depth of your transom that is measured. You should measure 21" from the top lip straight down like a plumb to the spot where the bottom of your hull would be if extended back and your hull is level with the ground. So if your transom measures 20" on its surface depth you'll be short on the correct measurement, hence your problem.

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Mon Apr 07, 2014 8:14 am
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Post Re: Shimming a motor on a transom??'s
Ok, I didn't measure it straight down like a plum bob, I measured the surface of the transom and it is about 19 & 3/4", I'll try shimming it, thanks

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1648 weld bilt being followed by a 35 gtr


Mon Apr 07, 2014 8:17 am
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Post Re: Shimming a motor on a transom??'s
First I'll run a straight edge from the bottom of the boat and measure it that way and see what I come up with.

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1648 weld bilt being followed by a 35 gtr


Mon Apr 07, 2014 8:19 am
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Post Re: Shimming a motor on a transom??'s
Ok I just measured it the way ya'll explained and it is 19", so I beleive I need more then just shims, I'll try to get it built up another 2", thanks again

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Mon Apr 07, 2014 8:27 am
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Post Re: Shimming a motor on a transom??'s
That should get you fixed up. That weldbilt prolly will like the middle pin once you get the transom up high enough.

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Mon Apr 07, 2014 8:44 am
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Post Re: Shimming a motor on a transom??'s
Thanks fellas

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Mon Apr 07, 2014 10:44 am
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Post Re: Shimming a motor on a transom??'s
Because of the large amount of backyard built boats that I see come thru here, I have to shim motors all the time. I use a piece of 1"x2" tubing like most of the builders use for their stringers, so that I can get the motor 1" or 2" higher.

If you need to go more than 2" up, I'd recomend building the transom higher.


Mon Apr 07, 2014 10:56 am
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Post Re: Shimming a motor on a transom??'s
Thanks doc, I probably try that route first

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Mon Apr 07, 2014 12:39 pm
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Post Re: Shimming a motor on a transom??'s
Think if measured agaist transom it should be 21" 11/16ths

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Thu Apr 10, 2014 8:40 am
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Post Re: Shimming a motor on a transom??'s
I shimmed it and it stopped all the water splash on the back of the motor, thanks

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Thu Apr 10, 2014 9:02 am
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