1978 Evinrude Outboards 9.9/15HP Service Repair Manual P/N 5394, Page 92Get this manual
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Figure 6-59 Gearcase Pressure Test Figure 6-56 Measuring Shift Rod Height, Top of Connector to Gearcase psi (110124 kPa)If pressure does not hold, submerge gearcase in water and check for source of le