1979 Evinrude Outboard 9.9/15 HP Service Repair Manual Item No. 5426, Page 28Get this manual
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DRAIN REW
Inspect the lens seal for cracks shrinkage vhich allow leakageWhen ssmblig SupPOl"t to housing, torque screws to 15-20 inlbs (1.6-2.2 )The release valves st seat tightly to prevent gas