1979 Johnson 2HP Outboards Service Manual, Page 40Get this manual
5-7 UPPER MAIN BEARING AND OIL SEAL Install main bearing through bottom of crankcasePress against 1ettered side of bearing case ea ring is recessed 116" (1.5 below finish thrust face of crankcaseAvoid 10ss of needles in main bearingEXHAU STPORT SIDE INT AKE PORT SIDE
Install oil sea1, PISTON INST ALLA TION
flush with top of cral1kcase
Coat piston and cylinder with oil and il1stall piston and connectil1g rod assembly through Push piston through cylinder until piston ring grooves exposedThe intake side of the piston deflector must placed toward the intake portSee Figure 5-19PISTON RINGS Install the piston rings "'11 piston Spread each ring with ring expander just enough to slip it oVt::r the head of the piston and down into See Figure 5-20the rings fit free1y in the piston ring groovesThe ring grooves pinned to secure the position of the rings primarily to prevent ends of the rings from catching the edges of the ports in the cylinder, but a1so to staggering of the ril1g gapsfully press piston and rings into cylinder head of piston is flush with top of cylinderNOTE Do not at beyond this point of cylinder lower ring will lock into recess