1995 Johnson Evinrude "EO" 9.9 thru 30, 2-Cylinder Service Manual, P/N 503146, Page 175Get this manual
4612Use feeler gauge to check groove side clearance on the lower square ringsInstall each square ring on its pistonWith the ring fully seated in its groove, make several checks around the piston The side clearance must not exceed 0.004 in(0,10 mm)4713Use machinist's straightedge to check clearance on the upper Pressure-BackTM ringsInstall each Pressure-Back ring on its pistonWhen checked with the straightedge, there should be enough ring clearance to allow the straightedge to touch the piston on both sides of the ring grooveMake several checks around the piston If the straightedge does not touch the piston, remove the ring and clean the ring grooveAssembly Proceed slowlyMake no forced assemblies unless pressing operation is called forAll internal components must be perfectly clean and lightly coated with Johnson or Evinrude Outboard Lubricant 3521