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Old 25 April 2013, 05:47   #11
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I considered that too. Will the epoxy not just drop out with any flex though as from experience it never bonds particularly well with the metal?
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Old 25 April 2013, 05:59   #12
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I would have thought the first this to have a look at is the gearbox oil. If its emulsified then your letting in water and you'll need to repair or replace your box.
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Old 25 April 2013, 06:21   #13
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I considered that too. Will the epoxy not just drop out with any flex though as from experience it never bonds particularly well with the metal?
So long as it's the right stuff for the job and has a good key to grip.
JB weld products are the best ones I've used.
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Old 25 April 2013, 07:11   #14
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Will the epoxy not just drop out with any flex
If there is any flexing of this "crack" you are stuffed before you start.

BTW expoxy adhesives are the dogs b*ll*cks when bonding to metals when properly applied.
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Old 25 April 2013, 07:31   #15
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Common problem with Yam boxes.
Crack to Yamaha 130 BETO Lower Unit, need Help with sourcing a replacement
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Old 25 April 2013, 14:40   #16
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Common problem with Yam boxes.
Yep, usually when they haven't been flushed properly for long periods.


The only solution is (assuming the crack hasn't got as far as the seal) to drill a VERY small hole at the end of the crack (this stops it from cracking any further) , grinding the crack out very slightly with a slitting disc and filling it with JB weld (JB weld does stick).

Don't use the 'rapid' version.
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Old 25 April 2013, 15:36   #17
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to drill a VERY small hole at the end of the crack (this stops it from cracking any further) , grinding the crack out very slightly with a slitting disc and filling it with JB weld (JB weld does stick).
Don't use the 'rapid' version.
Exactly what he said
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