Mariner Mercury 105/140 JET, Service Manual

Page: 591 / 797

90-824052R3 JUNE 2002 LOWER UNIT - 6B-35
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 reverse gear assembly and
bearing cup adapter.
1. Use a slide hammer and two-jaw puller to remove
reverse gear bearing assembly.
IMPORTANT: DO NOT remove ball bearing or
needle bearing from reverse gear unless replace-
ment of bearings is required. Bearings cannot be
reused after they have been removed.
a
c
b
a - Slide Hammer
b - Two-Jaw Puller
c - Reverse Gear Bearing Assembly
2. If inspection determines that replacement of
reverse gear ball bearing is required, then:
a. Install Universal Puller Plate (91-37241)
between reverse gear and ball bearing.
b. Place reverse gear, bearing and puller plate
on a press and press gear out of bearing
using a suitable mandrel.
d
a
b
c
51884
a - Reverse Gear Ball Bearing
b - Universal Puller Plate
c - Reverse Gear
d - Mandrel
3. If inspection determines that replacement of pro-
peller shaft needle bearing in REVERSE gear is
required, place REVERSE gear in press and use
mandrel 91-36569 to press bearing out of gear.
CLEANING AND INSPECTION
CAUTION
DO NOT spin bearings dry with compressed air,
as this could cause bearing to score.
1. Clean reverse gear and bearing with solvent and
dry with compressed air.
2. Inspect gear teeth for pitting, grooves, scoring,
uneven wear and for discoloration (from over-
heating). Replace gear if any of these conditions
are found.
3. Check clutch jaws on reverse gear for damage.
Replace reverse gear if damage is found.
4. Inspect ball bearing race for pitting, grooves,
scoring, uneven wear and discoloration (from
overheating). Replace ball bearing (on reverse
gear) if any of these conditions are found.
5. To determine condition of propeller shaft needle
bearings (in reverse gear), inspect propeller shaft
reverse gear needle bearing surface as outlined
in “Propeller Shaft Inspection.”