1965 Evinrude SportFour Heavy Duty 60 HP Outboards Service Manual, 4204, Page 45Get this manual
Figure 5-18Driving Out Wrist Pin Carbon accumulation on walls of the exhaust ports restricts the flow of exhaust gases and has considerable effect on performance of the motorCarefully scrape carbon from cylinder heads and exhaust ports with scraper or other blunt instrumentWalls of exhaust ports and all exhaust passages must be free from carbon deposits to insure maximum performance Avoid getting carbon in water jacketsWith continued operation of the motor, the cylinder walls will take on glaze which reduces the effectiveness of the seal between the piston rings and the cylinder wallsThe result will be reduced compression and decrease in performance of the motorBefore reinstalling the pistons, break the glaze by using fine cylinder hone to refinish cylinder wallsA few up and down motions of the tool should be sufficient to remove cylinder wall glazeSee Figure 5-19
Figure 5-17 "LOOSE" Mark on Piston hRemove wrist pin retaining ring, using Truarc No1 pliers (Special Tool #303857)See Figure 5-16 iDrive wrist pin through to free piston from rod