Suzuki 2002-2005 DF4/DF5/DF6 4-Stroke Outboards Service Manual, Page 97Get this manual
6-30 POWER UNIT
OIL SEALBEARING
Visually check the oil seals installed in the cylinder block and crankcase for cut, nick, excessive wear or other damageVisually check the crankshaft upper bearing for pitting, noisy, rough or other damage
NOTE: If neither defective nor any damage is found on the oil seals and the bearing, do not remove the oil seals and the bearing
Do not re-use the oil seal once removedAlways use new oil seal