1968 Evinrude Speedifour, Starflite 85HP Service Manual, Page 47Get this manual
cantModerate discoloration is not cause discardSEALS
balls and raceways
Replace crankcase head sealDO NOT reuse sealSeat new seal with facing in and flush with top crankcase headLower crankcase head seal should and any parts this assembly should damaged or worn Note ring to in groove inside carbon sealPISTONS Check the pistons roundness, excessive skirt wear, and scoringThe piston skirts must fectly round and unscratched to prevent the entry exhaust gases into the compression chamberSee Figure 5-24Carefully remove carbon deposits from inside piston headInspect the ring grooves for bon accumulation, excessive wear, damage to the ring seatsCarefully scrape carbon from the ring grooves, making certain that carbon clinging to the bottom and sides of the grooves has been thoroughly removed without scratching otherwise damaging the groovestool for cleaning the ring grooves made broken ring with sharpened edgemust taken not to damage the lower ring landsSee Figure 5-25.Check piston size and roundness, using micrometerCorrect sizes given in Section 2Figure 5-26Checking Ring Gap in Cylinder replaced replaced if assembled