Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 148Get this manual
IMPORTANT: If lower drive shaft ball bearing has been removedit is recommended that new bearing be installed as the removal process will damage the bearing1If removed, press new lower crankshaft ball bearing onto crankshaft as shownBe sure bearing is pressed firmly against shouldert,
If removed, spread new crankshaft sealing rings just enough to slide over crankshaft journal