1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, Service Repair Manual P/N 507875, Page 413Get this manual
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8 Install pressure gauge and adapter "A" to check problems in the UP circuit INotel Tighten
After tests are complete, install the manual release valve and torque to 45-55 inIbs(5-6 Nm)Ins