1985 OMC 65, 100 and 155 HP Models Commercial Service Manual, PN 507450-D, Page 236Get this manual
COB1359
Piston and Connecting Rod Installation Coat pistons and cylinder bores with oil and install piston and connecting rod assemblies, being sure to match each assembly with the cylinder it was removed fromThe exhaust side of the piston deflector must be placed toward the exhaust portThe piston rings must be compressed before the pistons can be replaced in the cylindersMake certain that the rings are correctly positioned in their grooves with respect to the groove pinsDamaged pistons and broken piston rings may result from imperfect alignment of the ring gap and the piston dowel pinsThe use of automotive type ring compressing tools should be avoided, as these frequently cause damaged pistons and broken piston rings through imperfect alignment of the ring gap and piston dowel pin Use OMC Special Tool PIN 327018 (Ring Compressor) for standard size rings and PIN 330221 for oversize ringsUsing one hand to push the piston into the cylinder, use the free hand to guide the connecting rod into place