Mercury Mariner Models 135 150 175 200 Service Manual, Page 421Get this manual

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COOLING
Shut off engine and refer to troubleshooting chart if water pressure is not within specificationDO NOT exceed 3000 RPM in neutralIdle Poppet Valve Opening W.O.T1.0 3.0 PSI (6.8 20.5 kPa)

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