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Old 04-23-2016, 05:22 PM
mviax002 mviax002 is offline
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Boat: MasterCraft, MariStar 240SC, 1993, High Performance 454
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1993 MariStar 240SC stinger/motor mount repair

Hi, I have a 1993 Maristar 240SC with the high performance 454 in it and the iron angle that is fiberglassed into the stringers that the motor mounts bolt to are coming loose from the fiberglass. The starboard side has completely broken loose and the port side is close to coming loose. Has anyone encountered this issue or have any suggestions on the best way to go about repairing this? Thanks in advance for any and all help!


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Starboard angle iron/motor support that has broken loose.

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Port angle iron/motor support still in place but fiberglass is cracking

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Port angle iron/motor support cracks

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Starboard angle iron/motor support in place.
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  #2  
Old 05-19-2016, 11:29 PM
Matt L. Matt L. is offline
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Wow dude, that frightens me just a bit! I think your biggest concern needs to be with why those stringers are coming apart like that. I've done my fair share of minor fiberglass repairs, but I don't feel qualified to comment much. My best guess is to carefully measure everything to several good reference points then tear out any bad material. Once its out you can assess the damage and figure out how to rebuild those stringers.

Good luck!

Matt
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Old 05-19-2016, 11:42 PM
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mikeg205 mikeg205 is offline
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I would talk to a fibreglass structural expert - what's that yellow stuff growing out to the crack... appears a lot of water was running into the mounting system.. I bet it could be rebuilt.. prolly similar to stringer redo.. but would really work with an engineer.
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Old 05-20-2016, 05:15 PM
Matt L. Matt L. is offline
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I agree, it looks like a lot of water has been in those stringers. May be even some freeze thaw cycles. That would tear things up pretty quick. Are there any cracks in the hull exterior in the vicinity of those engine mount stringers? You may have water seeping in that way.
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Old 05-20-2016, 07:40 PM
waterlogged882 waterlogged882 is offline
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Stringer time.....or there abouts....but you posted once and never came back... thanks
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Last edited by waterlogged882; 05-20-2016 at 08:40 PM.
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Old 05-20-2016, 11:35 PM
mviax002 mviax002 is offline
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The "yellow stuff" I think you're seeing in the picture is actually pollen that had fallen in the boat while I was pulling the motor.

I agree that I think water managed to get into the stringers and freeze over the winter causing it to crack. I have already glassed the steel angle back in place. This weekend I hope to finish reinforcing the side that didn't completely fall apart and try and get a nice smooth gel coat over all the repairs. I'm hoping to have the boat in the water Memorial Day weekend but I'm not sure I'll make it.
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Last edited by mviax002; 05-20-2016 at 11:56 PM.
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Old 05-20-2016, 11:44 PM
mviax002 mviax002 is offline
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No the exterior hull is in great shape. Not this past winter, but the winter before (2014/2015) I replaced the motor. The boat sat all winter with no engine cover, no motor, and I think water seeped into the bolt holes and froze causing weakness in the stringer. Then once I installed the new motor and used it last summer I think the stress from the freezing caused the motor to pull the steel loose. At least this is my best guess.

Edit: I tried to add pictures to my previous reply but for some reason I can only upload one photo. I guess it's because I'm on my cell phone.
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Last edited by mviax002; 05-20-2016 at 11:59 PM.
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Old 07-30-2016, 06:03 PM
Matt L. Matt L. is offline
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Wow! That looks much better! I think the freeze thaw thing did the damage. Looks nice and tight now. I'd think that will hold together nicely!

Taker care,
Matt
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