1968 Evinrude Ski-Twin, Ski-Twin Electric 33 HP Outboards Service Manual, Page 47Get this manual
PISTONS, WRIST PINS, AND
The re1ative positions of pistons and connecting rods must considered when assembling pistons to rodPistons must installed in cylinders with intake side of deflector toward intake portSee Figure 5-22 Oil ho1e in wrist pin end of cOl1necting rod must toward top of motorSee Figure 5-23 coat of oil to wrist pinmaking sure surface is c1eandrop two of oil in each pin ho1e in the piston
One of the piston bosses is bored for slip fit the wrist pin and the other for press fitWhen installing the wrist pin, drive from the side marked "LOOSE", using fixture to guard against distortion damage during the operationIl1sert wrist pin through h01e in one side of pistol1Oil wrist pin bearing in connecting rodnecting rod in position, thel1 proceed to instal1 the wrist pinThis done easily if the piston is heated slightly, causing it to expanddRep1ace retainil1g rings, 1ettered side out, making certain they to rest secure1y il1 the groove provided for this purposeCheck piston with micrometer to determine whether piston has been distorted during assembly