Mariner Mercury 105/140 JET, Service Manual

Page: 590 / 797

6B-34 - LOWER UNIT 90-824052R3 JUNE 2002
a. Position driveshaft in a vise; DO NOT tighten
vise jaws against shaft.
b. Strike shaft with a lead hammer; take care not
to drop shaft.
51866
12. Sport Master Gear Case - Both upper and lower
tapered roller bearings can be removed from the
driveshaft in one operation. Using the bottom
bearing cup removed from the gearcase, place
the cup on top of a vise leaving the vise jaws open
enough to allow the driveshaft to slide through.
Place the driveshaft through the cup and vise
until the bottom bearing is resting in the cup.
While holding the driveshaft, tap on the top of the
shaft with a lead hammer until the bearings are
free. Do not drop the shaft when performing
this operation.
b
a
a - Lower Bearing Cup Removed from Gear Case
b - Driveshaft with Both Upper and Lower Bearings
13. Remove 18 loose needles from outer race of
driveshaft needle bearing.
14. If inspection of driveshaft needle bearing surface
determines that replacement of needle bearing is
required, the 18 loose needle bearings
previously removed must be reinstalled in
bearing race to provide surface for mandrel to
drive against.
NOTE: Reverse gear must be removed first before
removing driveshaft needle bearing.
IMPORTANT: Discard driveshaft needle bearing
after removal. (Bearing cannot be reused.)
51869
c
b
a
a - Mandrel (91-37263)
b - Pilot* (91-36571)
c - Driver Rod* (91-37323)
*From Bearing Removal and Installation Kit (91-31229A5)
CLEANING AND INSPECTION
1. Clean driveshaft, tapered bearing and race, and
pinion gear with solvent. Dry with compressed
air. DO NOT allow driveshaft bearing to spin while
drying.
2. Inspect pinion gear for pitting, grooves, scoring,
uneven wear and/or discoloration from
overheating. Replace pinion gear, if any of the
above conditions are found.