1976 Evinrude 40HP outboards Service Manual, Page 53Get this manual
REASSEMBLY OF POWER HEAD Proceed slowlyMake no forced assemblies unless press fits are called for and make no "dry" assembliesBe sure all parts to be assembled are clean and free from dirt and gritPerfectly good cylinder walls, pistons and rings can be ruined in few minutes of operation unless all forms of grit are removed before assemblyWork in clean surroundings and with reasonably clean handsCoat all bear ing surfaces, cylinder wallS, etc with clean oil before assemblyWhere the us of "oil" is specified, we recommend OMC Outboard LubricantNOTE Always use new gaskets and seals throughout when reassembling the power headApply OMC Gasket Sealing Compound #317201 lightly to both sides of gaskets and to outside diameter of metal cased seals
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One of the piston bosses is bored for slip fit on 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 or damage during the operationSee Figure 5-16cInsert wrist pin through hole in loose side of piston Oil wrist pin bearing in connecting rodPlace connecting rod in pOSition, then proceed to install the wrist pinThis can be done more easily if the piston is heated slightly, causing it to expanddReplace retaining rings, lettered side out, making certain they come to rest securely in the groove provided for this purposeeCheck piston with micrometer to determine whether piston has been distorted during assemblySee Figure 5-20INTAKE SIDE OF DEFLECTOR