1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 180Get this manual

1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 180

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POWERHEAD
1 Wash thermostat with clean waterUsing thermostat tester, similar to the one shown, test thermostat as follows: 2 Open thermostat valve, then insert thread between valve and thermosta