1979 V6 150-235 HP Johnson Outboards Service Repair Manual P/N JM-7910, Page 179Get this manual

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Screw gearcase tester hose into valve testerSee Figure 9-10pressure to 30 psi (207 kPa)Immerse test in clear water and look for bubblesSee Figure 9-11 ANALYSIS OF TEST The check valve should seal pres

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