1978 Johnson 175, 200, 235 HP Outboard Service Manual, Page 86Get this manual
PISTONS, WRIST PINS, AND CONNECTING RODS aThe difference between port and starboard cylinders must be considered when assembling pistons to rodsPistons must be installed in cylinders with intake side of deflector toward intake portSee Figures 5-49,BOil hole in cOJUlecting rod must be facing top of motorSee Figure 5-50 NOTE One of the piston bosses is bored for Slip fit on the wrist pin and the other for press fit When installing the wrist pin press from the Side marked ilL" (loose), using fixture to guard against distortion or damage during the operationcIns ert wrist pin through Slip fit side of pistonOil wrist pin bearing in connecting rodPlace connecting rod in position, then proceed to press the pin into pistonSee Figure 5-40This can be accomplished more easily if the piston is heated slightly, causing it to expand
NOTE Check the piston to insure that out-of-roundness is within acceptable limits after the wrist pin is installedReplace the piston if variation in diameter of the piston at the bottom of the piston skirt is greater than 0.004" (0.10 mm) when measured with micrometerdReplace retaining rings, making certain they come to rest securely in the groove provided for this purpose, using OMC Special Tools Cone Part #318600 and Driver #318599See Figure 5-51