Mercury Mariner Models 135 150 175 200 Service Manual, Page 423Get this manual
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COOLING
4 PSI (27.4 61.6 kPa) between 1000 2200 RPM
Pressure is below minimum spec- 12 PSI (54.9 68.5kPa) ification W.O.T
Pressure higher than normal W.O.T but engine s