1991 Johnson/Evinrude EI Outboards 2.3 thru 8 Service Manual, Page 171Get this manual
1261 7Install piston rings on each pistonSpread each ring with ring expander just enough to slip it over the head of the piston and down into place8Coat the pistons and cylinder bores with oil
1271 9Place the piston in OMC Ring Compressor PIN 326589Make certain that the rings are correctly positioned in their grooves with respect to the dowel pinsDamaged pistons and broken rings may result from imperfect alignment of the ring gap and the dowel pins
The piston rings must be correctly located on their dowel pins to prevent permanent powerhead damage
1271 10Start the piston into bore of the cylinder with deflector
of the piston (sharp edge) toward intake port side cylinder block
11Loosely install the cylinder head to prevent the pistons from falling out
Connecting rod cap cannot be turned end for endTo assist correct assembly, small embossments are provided on matching side of rod and cap
291 12If removed, lubricate inside of new crankshaft seall