Mariner Mercury 105/140 JET, Service Manual

Page: 682 / 797

6D-30 - LOWER UNIT 90-824052R3 JUNE 2002
3. Attach Bearing Carrier Removal Tool
(91-46086A1) and Puller Bolt (91-85716) onto
gear housing.
4. Torque puller bolt against propeller shaft to 45 Ib.
in. (5.0 N·m). Turn driveshaft 10 revolutions with
the load applied to propeller shaft. This will seat
forward gear bearing.
a
d
e
c
51867
b
a - Propeller Shaft (DO NOT install shift cam)
b - Bearing Carrier (assembled)
c - Cover Nut (Tighten; DO NOT torque)
d - Bearing Carrier Removal Tool (91-46086A1)
e - Puller Bolt (91-85716); Torque to 45 lb. in. (5.0 N·m)
5. Fasten dial indicator to gear housing and
Backlash Indicator Tool (91-78473) to driveshaft.
6. Recheck torque on puller bolt [45 Ib. in. (5.0
N·m)].
7. Position dial indicator pointer on line marked “1”
on Backlash Indicator Tool, if gear ratio is 1.87:1
(15 teeth on pinion gear), or on line marked “2” on
Backlash Indicator Tool, if gear ratio is 2:1 (14
teeth on pinion gear) or on line marked “4” if gear
ratio is 2.3:1 (13 teeth on pinion gear).
51880
d
e
a
b
c
a - Thread Stud Adaptor (from 91-14311A1)
b - Stud
c - Backlash Indicator Tool (91-78473)
d - Dial Indicator Holder (91-89897)
e - Dial Indicator (91-58222A1)
8. Lightly turn driveshaft back-and-forth (no
movement should be noticed at propeller shaft).
9. Dial indicator registers amount of backlash which
must be 0.018
″
to 0.027
″
(0.46mm to 0.69mm)
for the 1.87:1 gear ratio, 0.015
″
to 0.022
″
(.38mm
to .56mm) for the 2:1 gear ratio and 0.018
″
to
0.023
″
(0.46mm to 0.58mm) for the 2.3:1 gear
ratio.
10. If backlash is LESS than the specified minimum,
REMOVE shim(s) from in front of forward gear
bearing race to obtain correct backlash. When
reinstalling pinion nut, apply Loctite 271 on
threads of nut.
11. If backlash is MORE than the specified
MAXIMUM, add shim(s) in front of forward gear
bearing race to obtain correct backlash. When
reinstalling pinion nut, apply Loctite 271 on
threads of nut.
NOTE: By adding or subtracting 0.001
″
(0.025mm)
shim, the backlash will change approximately 0.001
″
(0.025mm).