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

CYLINDER BLOCK AND CRANKCASE
MeasuringTesting Thermostat
1Inspect thermostat, replace if stuck or damaged
2Use Measurement Test following to measure: aValve opening temperaturebValve lift
MEASUREMENT TEST

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