Mariner Mercury 105/140 JET, Service Manual

Page: 717 / 797

90-824052R3 JUNE 2002 LOWER UNIT - 6E-25
11. 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.
3. Inspect driveshaft needle bearing surface (area
just above pinion gear splines) for pitting,
grooves, scoring, uneven wear and/or discolor-
ation from overheating. Replace driveshaft and
driveshaft needle bearing, if any of the preceding
conditions are found.
4. Inspect driveshaft to crankshaft splines for wear.
Replace driveshaft if wear is excessive.
5. Inspect tapered bearing race for pitting, grooves,
scoring, uneven wear and discoloration from
overheating. Replace tapered bearing and race
as a set, if any of the preceding conditions are
found.
6. Inspect driveshaft for groove(s) where water
pump base oil seals contact shaft. Replace drive-
shaft if groove(s) are found.
Reverse Gear
REMOVAL AND DISASSEMBLY
NOTE: Reverse gear can be removed from gear
housing only after driveshaft and pinion gear have
been removed.
NOTE: Cautiously applying heat to both sides of
gearcase where reverse gear assembly is located
will aid in removal of bearing cup adapter.
1. Remove reverse gear by hand.
50884
a
a - Reverse Gear
IMPORTANT: DO NOT remove needle bearing
from reverse gear unless replacement of bearing
is required. Bearing cannot be reused after it has
been removed.