1992-2000 Mercury Mariner 105-225HP outboards Factory Service Manual, Page 435Get this manual

1992-2000 Mercury Mariner 105-225HP outboards Factory Service Manual, Page 435

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2.5 Litre V-6 Water Flow Diagram 2000 Models 10 12
NOTE: If poppet valve is stuck open at low RPM, the engine will not reach proper operating temperature (run cold) and will run rough at idle562