What shim material to use between the transom & motor mount? - SailNet Community
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post #1 of 16 Old 03-08-2013 Thread Starter
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What shim material to use between the transom & motor mount?

Here's my project. My boat is a Compac 19. It presently has a Garelick motor mount. The problem is that I can't get the mount in the full up position since the handle of the mount hits the rubrail. I'm looking to put an inch shim between the transom and the mount. I used to have a good source for UHMWPE but no more. I need suggestions on what material to use that will look good without breaking the bank.

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post #2 of 16 Old 03-08-2013
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Re: What shim material to use between the transom & motor mount?

Hi,

you could try HDPE cutting boards. They can be cut quite neatly with a pendular saw and even bent into shape with the help of a hot air gun.
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Re: What shim material to use between the transom & motor mount?

Same thing, Marc. White cutting boards from the dollar store. They're not all the same and they're not a dollar anymore, but that's your best bet for a real low price on those kind of plastics.
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Re: What shim material to use between the transom & motor mount?

McMaster Carr has UHWPE - $40 for 12" by 12" by 1" :

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Re: What shim material to use between the transom & motor mount?

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Same thing, Marc. White cutting boards from the dollar store. They're not all the same and they're not a dollar anymore, but that's your best bet for a real low price on those kind of plastics.
I read somewhere that there are interior and exterior grades of UHMWPE. That interior grades degrade in sunlight. Have you heard anything of the sort? Any way for us simple folk to differentiate between them?
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Re: What shim material to use between the transom & motor mount?

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McMaster Carr has UHWPE - $40 for 12" by 12" by 1" :

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Thanks for the link.
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Re: What shim material to use between the transom & motor mount?

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I read somewhere that there are interior and exterior grades of UHMWPE. That interior grades degrade in sunlight. Have you heard anything of the sort? Any way for us simple folk to differentiate between them?
Simple solution - paint it, whatever the grade.

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Re: What shim material to use between the transom & motor mount?

At the dollar store (or WalMart) you are buying "White plastic". Unspecified type, density, uv resistance, but it may be ten bucks instead of fifty, at which point I'd just take the risk for a simply shim that can be easily replaced if it is a mistake. And sprayed with 303 or another UV protectant as well, if you want to help the odds.

McMaster or Grainger, slab, shipping...I'm afraid to ask. Oh, I see MarkSF ran that down--for a small piece. So, maybe $80 plus shipping for a slightly wider one.

SF, you've got PAINT that will stick to polythenes??
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Re: What shim material to use between the transom & motor mount?

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Hi,

you could try HDPE cutting boards. They can be cut quite neatly with a pendular saw and even bent into shape with the help of a hot air gun.

How will the UHMWPE boards be labelled? I'm guessing that the packaging will just say something like durable, sanitary plastic.
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Re: What shim material to use between the transom & motor mount?

Over here, things are pretty well marked or described on the packaging. It's not required by law (yet) but is supposed to aid recycling later on. If I for example check on the IKEA website, their 1 chopping boards are described as "Polyethylene Plastic" and you'll find the same at least on a sticky label on the item.

Most companies here follow the Resin Identification Code :



Just checked on WIKI, they state the same system is in use in North America, though my Canadian Admiral states she never saw it when she was still living over there
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