Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 162Get this manual

Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 162

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CYLINDER BLOCK AND CRANKCASE
1 Tie piece of thread (or other non-conductive material) onto the thermostat2 Suspend the thermostat in water3 Heat water slowly while observing the thermostat

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