1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 152Get this manual

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Thermostat Wash thermostat with cle an waterUsing thermostat tester, similar to the one shown, test thermostat as follows: pen thermostat valve, then insert thre ad betwe en valve and thermostat bodyA

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