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Old 18 August 2005, 08:29   #1
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Engine Mounting...tips please!

Will soon be mounting my engine on my RIB. Just wanted to make sure there aren't any issues I may encounter along the way. We have made a template to get the exact hole positions and fabricated a marine ply plate to put between the transom and engine saddle. I have choosen to keep the engine in the middle rather than offsetting it and will have it at the recommended height when on its upper mounting holes (so I can move it up if I want to in the future).

I was thinking of gluing some left over hypalon from my tube fitting over the top of the transom to give it a little padding...good idea or not? I don't see what I would have to loose.

Any tips etc on fitting engines would be appreciated.

Cheers

Tim
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Old 18 August 2005, 11:10   #2
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Tim, don't understand what the marine ply is going to do for you. Also what happens if you need to lower the engine one hole because it cavitates to much in the corners ?

Otherwise okay, spare hyperlon piece should be okay, have a chat with MeMe about colour coordinating accessories and cushions

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Old 18 August 2005, 11:25   #3
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Tim

I would put the big bit at the top and the little spinny bit at the bottom.

Didn't they teach you anything at S'ampton Uni?

As Pete says, wots the ply for? Or is that just the template for drilling the holes.
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Old 18 August 2005, 12:44   #4
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Tim

I have rigged 2 Shaky 520's, the engine wants to be slap bang in the middle (no offset) and very low as the hull was designed to be a longer boat, you may need fins on the engine to stop cavitation with a light engine, the 520 seems to be very stern light, and handeled better with the four stroke.

Drop me a line if you need any advice.
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Old 18 August 2005, 13:24   #5
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Thanks for the advice.

We made the plywood pad as the tohatsu manual told us to...I wasn't convinced we needed it but I guess it will protect my shiney gelcoat on the transom! It will also be used as a template.

The standard height to mount the engine is with the cavitation plate 10-15mm below the bottom of the boat. This should be enough shouldn't it?

Tim
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Old 18 August 2005, 15:32   #6
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Quote:
Originally Posted by slimtim
The standard height to mount the engine is with the cavitation plate 10-15mm below the bottom of the boat. This should be enough shouldn't it?
Will be fine for the shaky
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Old 18 August 2005, 16:48   #7
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Tim

The plywood pad will be a pain to keep re-varnishing every year to keep it from looking shabby.

My slant on the situation is that outboards should be mounted directly to the transom. Anything you introduce that can go soft and allow any flexing of the saddle can cause the casting to fracture.

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Old 18 August 2005, 17:24   #8
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hhmmm, good point. I was going to epoxy it though so I guess it will last a little longer than varnish.

Tim
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Old 18 August 2005, 17:47   #9
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Be better with a stainless spreader plate, but direct to the transom for me and you'll never see any damage caused by the installation to the gel coat as it'll be under the bracket. Don't worry too much Tim, if you do develop little stress cracks the stainless route can be done later.

Mines had twins and at least 3 other outboards on the back Tim
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Old 10 April 2010, 05:00   #10
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Some very good advice here.
would never of thought about the ply going soft and causing stress to the brackets



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