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The members that own Mercury engines may be able to help you out here once they see this thread.

Look at the Teleflex site for more info on your steering system once you determine it is definitely hydraulic.
http://www.teleflexmarine.com/index.c...gi?type=us
And this is the SeaStar hydraulic system.
http://ww2.seastarsteering.com/ering.com/