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Old 17 November 2012, 07:49   #1
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Gearbox dismantling?

I have a Mariner with a badly damaged cavitation plate that I am considering getting welded. Having done a bit of research it seems to be wise to strip it to avoid damage to the seals. Is it a major task for the home workshop or best left to a marine workshop?
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Old 17 November 2012, 08:09   #2
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Most if not all of the mar/merc gearhousings require special tools,also the service manuals on all merc/mar range say that seals should always be changed when rebuilding a gearhousing, and and when re-built the gearhousing should be preasure tested which is best before refitting.
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Old 17 November 2012, 10:59   #3
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Thanks for that, looking at it I'm hopeful that if the welders patient it won't damage the internals!
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Old 17 November 2012, 13:42   #4
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Hmmm. You're risking more than the seals. If they are damaged, you get water ingress, then destroy the gears and bearings. I suppose a pressure test after the welding would go a long ways in enduring integrity, but I'd personally go the dismantling route.

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Old 18 November 2012, 10:28   #5
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I would never weld a gearhousing without stripping the inards out first, and I would never refit it without replacing all seals and preasure testing as well,I just wrote above what would be required to do the job.
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