Mercury Mariner Outboards 45 Jet 50 55 60 HP Models Service Manual, Page 162Get this manual

Mercury Mariner Outboards 45 Jet 50 55 60 HP Models Service Manual, Page 162

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Measure cylinder bore inside diameter (with an inside micrometer) of each cylinder, as shown belowCheck for tapered, out-of-round ("egg-shaped") and oversize bore TO CHECK: Inspect check valves by loo