1968 Evinrude Big Twin, Lark 40 HP Outboards Service Repair Manual P/N 4483, Page 49Get this manual

1968 Evinrude Big Twin, Lark 40 HP Outboards Service Repair Manual P/N 4483, Page 49

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side of piston is marked "Loose" insideSee Figure 5-17 When wrist pin is to removed, "Loose" side of piston must and driving tool must applied to loose sideAlways drive from loose side to tight side,