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Loose lower pylon mount

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tmacdonald View Drop Down
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    Posted: April-10-2009 at 10:02pm
I have a 98 Ski that I bought last summer. The boat came with the exteneded pylon and I ordered in a standard height one. I went to install the pylon today and as I was removing the old one I came to find that the plate in the floor that holds the bottom u-bolt for the pylon is loose in the floor. I am wondering if anyone has had this happen to them and if so what they did to repair it.
Trevor
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Grand Poobah
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fl Inboards Quote  Post ReplyReply Direct Link To This Post Posted: April-11-2009 at 10:41am
This is not an easy fix to perform correctly.
First the motor has to come out of the boat. Second the Pylon and motor frame has to come out. Third cleanly grind out the broken fiberglass down to the last lay up layer of the hull, clean up stainless Foot assembly (the part that broke loose). I like to bead blast this part and de grease.
Reinstall the motor frame.
The next steps are crucial to getting the stainless foot properly installed.
Drop the pylon back in its motor frame assembly. bolt the stainless foot back on the bottom of the pylon. Now comes the tricky part! I like to use plexus for the next step and I mix up a large glob and spred it under the pylon foot and set down in the hull with a little down pressure then I tighten the u-bolts on the motor frame to pylon this needs to be done also to square up the pylon in the boat. Let this set up for about an hour. Side note, I use Plexus for the bedding however I have also just did a quick lay up to bed the foot to stay in place to set the foot.
After the bedding procdure has cured out remove the pylon.
laying up the foot now is the part that needs some attention. I use a overlapping lay up of mat heavy cloth then mat then heavy cloth. This lay up also requires that as the layers of glass goes in that it is inner locked front to back to rear and the key to this is that a wall of glass is built up behind the foot as that is where the leverage force is carried. also pay attention to how much glass is installed as the pylon has to easily go back in with out interferance, you dont want to have to go back in with a die grinder and create room to reinstall the pylon.
Paint repair area with bilge paint or if you have the real gel coat that CC uses. then reinstall pylon reinstall motor.
I have done this by myself in less than eight hours.

a couple of side notes:
I remove the engine frame because I have a large Makita grinder and can grind and clean the repair area in a few swipes.
Also this can be a very messy propisition, cover up the carpets and any thing you do not want grind dust on.

If you have to have a shop perform this be prepared to pay up to $1000,00. I would charge around $850.00.

good luck


Hobby Boats can be expensive when the hobbyist is limited on their own skill and expertise.




1993 Shamrock "fat" 20. 2008 Nautique 196 5.0
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tmacdonald View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tmacdonald Quote  Post ReplyReply Direct Link To This Post Posted: April-12-2009 at 10:30pm
Thanks for the response. I attemted this procedure with the engine in but found it just too difficult to get the glass set in with it in there so out will come the engine. The thing is, the more I think about the way they secure that bottom bracket to the hull, the more it seems like a poor design. My thought is to pull the engine cradle and take it with the pylon into a welding shop. I thought I could get the shop to extend the pylon mount down and re-inforce it instead of mounting the pylon base to the hull. We had an older ski boat from the 70's and the pylon in that was mounted similar to what I am thinking. Any thoughts on if this would be a good way to go?
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Grand Poobah
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fl Inboards Quote  Post ReplyReply Direct Link To This Post Posted: April-13-2009 at 1:12pm
Hi their.
Before you start reverse engineering the pylon foot let's think about it!
Correct Craft built a few thousand boats with the pylon foot installed correctly. Your boat may have had undue or overly stressed influences upon the pylon, or! The pylon foot was not installed correctly from day one. Many many Correct Crafts have been built with out any failures such as what your boat experienced. The bulk (which have been few) of the pylon foot failures that I have seen are due to poor initial installation.
I would reinstall the pylon foot like it was supposed to be installed and make sure any pylon attachments like sky poles or what not are installed and adjusted as per manufacturers recomendations.
Hobby Boats can be expensive when the hobbyist is limited on their own skill and expertise.




1993 Shamrock "fat" 20. 2008 Nautique 196 5.0
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