1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 266Get this manual
NON BIGFOOT GEAR HOUSING
Drive Shaft Bushing, Bearing and Lubrication Sleeve
1Inspect drive shaft bushing and bearing surface to determine condition of corresponding upper drive shaft bushing and lower drive shaft needle bearingIf drive shaft surface is rusted, pitted, discolored (blued lack of lubrication) or worn; replace drive shaft and corresponding bushingbearingDO NOT remove bushing or bearing if replacement is not necessary
a-Bushing Surface b-Bearing Surface c-Upper Drive Shaft Bushing d-Lower Drive Shaft Needle Bearing IMPORTANT: If upper drive shaft bushing or lower drive shaft needle bearing appear to be spinning in their respective bores, the gear housing should be replaced2To replace upper drive shaft bushing, use Snap On Expanding Rod (CG 40-4) Snap On Collet (CG 40A6) Slide Hammer (91-34569A1) Purchase from: Snap On Tools Corporation 280180th Street Kenosha, WI 53141-1410