1997 Johnson/Evinrude EU 25, 35 HP 3-Cylinder outboards Service Manual, Page 141Get this manual
20When all pistons and connecting rods are assembled, install piston ring setsInstall each piston ring set on the piston that was used to test the ring clearances
rn Note Be sure gap of ring fits squarely around dowel pinNote Before continuing, be certain all OMC Gel-Seal" sealant has been removed from the cylinder block and crankcase mating flangesIf traces of hardened OMC Gel-Seal" sealant are left, main bearing misalignment might occurRefer to Cleaning, this section21Rotate cylinder block so that the cylinder head surface is facing up and horizontal to the floor
INote Use one the following
the pistons into the block: 500 500 565 565 cc cc cc cc
ring compressor tools for inserting
Standard: OMC PIN 342218 Oversize: OMC PI 342219 Standard: OMC PIN 342220 Oversize: OMC PI 342221