Join Date: Feb 2010
Location: Narragansett Bay
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Re: Volvo penta md6b
ZF/Hurth gears are often matched up with Volvos. Try them.
You'll either need to provide a better description of the threaded shaft or post a picture.
Is this the OEM engine that belongs in the boat or are you modifying. The later could be an extreme project. It could cost more than the boat is worth, after buying a gear and all the proper mating hardware, shaft, prop, etc. The original prop pitch, shaft length, gear reduction ratio, etc, could be matched differently.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.