Mariner Mercury 105/140 JET, Service Manual

Page: 646 / 797

90-824052R3 JUNE 2002 LOWER UNIT - 6C-29
NOTE: By adding or subtracting 0.001
″
(0.025mm)
shim, the backlash will change approximately 0.001
″
(0.025mm).
c
d
e
a
b
51868
f
a - Stud Adaptor
b - Stud
c - Backlash Indicator Tool (91-19660)
d - Dial Indicator Holder (91-89897)
e - Dial Indicator (91-58222A1)
f - Dial Indicator Pointer
11. Remove bearing carrier removal tool and puller
bolt from gearcase assembly.
12. Remove cover nut and apply 2-4-C w/Teflon
Marine Lubricant to cover nut threads in
gearcase.
13. Install tab washer against bearing carrier.
NOTE: Gearcase should be mounted in a suitable
gearcase stand or bolted to engine driveshaft
housing before attempting to torque cover nut.
14. Start cover nut a few turns by hand, then, using
Cover Nut Tool (91-73688) and torque wrench,
torque cover nut to 210 Ib. ft. (285.0 N·m).
15. Bend one lock tab of tab washer into cover nut
(only one will align).
16. Bend remaining tabs of tab washer toward front
of gear housing.
NOTE: Reverse gear backlash is not adjustable.
However, reverse gear backlash which should be
0.030
″
- 0.048
″
(0.76mm - 1.21 mm) can be mea-
sured to determine proper assembly of gearcase as
follows:
a. With dial indicator and backlash indicator
installed as previously shown, shift gearcase
into reverse gear.
b. While holding propeller shaft, shift gearcase
into NEUTRAL and rotate propeller shaft
approximately 1/24 of a turn or 3
°
- 5
°
of
rotation.
c. Shift gearcase into REVERSE. Clutch dog
teeth and reverse gear clutch teeth should
not engage but strike against one another.
d. While holding shift mechanism in this posi-
tion, gently rock driveshaft back and forth to
determine reverse gear backlash.
If reverse gear backlash is not within the specified
tolerance, then gearcase is not properly assembled
or parts are excessively worn .In either case, the
gearcase will have to be disassembled and
corrections made before gearcase is returned to
service.
e. Remove bearing preload tool, backlash
indicator tool, dial indicator holder and dial
indicator from gear housing assembly.