1970 Johnson 115 HP Outboard Motor Service manual, Page 54Get this manual
hU necessary to remove wrist pin, emove wrist pin retaining ring, using Truarc No.1 pliers (Special Tool 1303857)See Figure 5-19
One side of piston Is markedLOOSE" on insideSee Figure 5-20When 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 5-21iDrive wrist pin through to free piston from rod
CLEANING, INSPECTIONAND REPAIR
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 ope ratedMajor portion of wear is in the port area and the area covered by ring travelCheck cylinder for size and wall straightness by using an ins ide micrometer or dial bore indicatorRefer to Section for specified dimensionsIf wear is greater than .003", replace cylinde block, rebore block for oversize pistonsPistons and ring sets are availableSee Section 2, SpecificationsNOTE