Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 233Get this manual

Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 233

3 Using two screwdrivers, lift water pump body up and off drive shaftRemove plate and two gaskets
Remove impeller from drive shaft(It may be necessary to use punch and hammer to drive impeller upward on drive shaftIn extreme casesit maybe necessary to split hub of impeller using hammer and chisel Remove impeller drive key

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