1970 Johnson 115 HP Outboard Motor Service manual, Page 57Get this manual
NOTE Always use new gaskets throughout when eassembling the power headPISTONS, WRIST PINS, AND CONNECTING RODS aThe differe nce between port and tarboard cylinders must be considered when assembling pistons to rodsPis tons must be installed in cylinders with intake side of defl ector toward intake port Oil hole in connecting rod must be toward top of motorSee Figures 5-29 and 5-31bApply coat of oil to wrist pin, making sure urface is cleana drop or two of oil in each pin hole in the pistonPlace
One of the piston bosses is bored for lip fit on the wrist pin and the other for press fitWhen installing the wrist pin, drive from the ide marked "LOOSE", USing fiXture to guard against distortion or damage during the operationFigure 5-28Checking Ring Groove Clearance cInsert wrist pin through Slip fit side of pistonOil wrist pin bearing in cOlUlecting rodPlace connecting odin poSition, then proceed to drive or press the pin into pistonSee Inset, Figure 5-29This can be accomplished mor easily if the piston is heated slightly, caus ing it to expanddReplace etaining rings, making certain they come to rest secur ely