1992-2000 Mercury Mariner 105-225HP outboards Factory Service Manual, Page 478Get this manual

1992-2000 Mercury Mariner 105-225HP outboards Factory Service Manual, Page 478

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4 Install test adaptor 91-822778A3 into manual release valve hole54458 Test Adaptor (91-822778A3)
6 Reinstall fill plug7 Disengage tilt lock lever8 Open valve (f) and close valve (g)9 Run trim "