1965 Evinrude 90 HP StarFlite Service Manual, PN 4206, Page 51Get this manual
One side of piston is marked "LOOSE" on in ideSee Figure 5-20 When wrist pin is to be removed,LOOSE" side of piston must be up and driving tool must be applied to loose sideAlways drive from loose side to tight side, being careful not to distort pistonSee Figure 5-21 Figure 5-19 Removing Wrist Pin Retaining Ring to save the rings even when they are not stuckInstall complete set of new rings on every power head service jobiRemove wrist pin retaining ring, using Truarc No1 pliers (Special Tool303857)See Figure 5-192 014
jDrive wrist pin through to free piston from rod
Figure 5-21Driving Out Wrist Pin
C ANINGIN CTIONAND EPAIR
CYLINDER BLOCK AND CRANKCASE Check cylinder walls for excessive wear, and check cylinder ports for carbon accumulationCylinder walls wear in various degrees depending on lubrication and conditions under which the motor is operatedMajor portion of wear is in the port area and the area covered by ring travelCheck cylinder for size and wall straightness by using an inside micrometer or dial bore indi cat orRefer to Section for specified dimenSionsIf wear is greater than .003", replace cylinder block, or rebore block for oversize pistonsPistons and ring sets are available .020" and .040" oversize NOTE