1974 Johnson 40 HP Outboard Motors Service manual, Page 53Get this manual
tor must be placed toward the intake portSee Figure 5-24 Make certain that the rings are correctly positioned in their grooves with respect to the gr oove pinsDamaged pistons and broken rings may result from imperfect alignment of the ring gap and piston dowel pinThe use of automotive type ring com pressing tools should be avoided, as these frequently cause damaged pistons and broken piston rings through imperfect alignment of the ring gap and piston dowel pinThe use of Special Tool 1308866 (for standard size rings and pistons only) is recommended See Figure 5-2 6Using one hand to push the piston into the cylinder, use the fr ee hand to guide the connecting rod into place and to align the rod with respect to the crankshaft " O" ING LOW MAI BEARI NG
UPPER SEAL AND BEAR ING HO US ING TAINING RING TRUARC RING