Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 239Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 239

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CYLINDER BLOCKCRANK CASE
CleaningInspectionRepair
Thermostat
1 Inspect thermostat, replace if stuck or damaged
2 Use Measurement Test followi ng to measure: aValve opening temp