1980 Johnson 2HP Service Manual, Page 39Get this manual
5-6 ring landsFigure 5-13using micrometerstep Check piston for size and roundness, below Before installing new piston rings, check gap betw een ends of ring placing ring in cy1inder then pushing ring down in the s1ightly Figure 5-14Check with the bottom of the piston to square it for ring groove clearance with fe ele gageFigur 5-15Correct gap and groove clearances given in Section 2
REASSEMBLY OF POWERHEAD
Proce ed slowlyMake forced assemblies unles press fits called for, and make "dry" assembliessure parts to assembled clean and free from dirt and gritperfectly good cylinder waH, piston, and rings ruined in few minutes of unless forms of grit removed before assemblyWork in clean surroundings and with reasonably clean handsCoat bearing surfaces, cylinder wall, etc with clean oil before assemblyWhere the us of oil is specified, we recommend 501 Outboard LubricantDNOTE Always use new gaskets coated lightly with gasket sealing compound part 317201 when reassembling the power headPISTON, WRIST PIN, AND The relative position of piston and in reassemblyPiston must instaHed 5-16ROD rod must considered rod as illustrated in Figure