Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 25Get this manual

Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 25

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Engine DETONATION
Water Pressure Check
NOTE: To perform these checks, Water Pressure Gauge Kit, (91-79250A2) is recommended
1 Water pressure at idle, in NEUTRAL, is 1-12 4-12 psi(10.