Mercury 45 Jet 50-55 - Bearing Carrier and Propeller Shaft Installation

6B-28 - LOWER UNIT 90-817643R1 DECEMBER 1996
7. Lightly turn drive shaft back-and-forth (no move-
ment should be noticed at propeller shaft).
8. Dial Indicator registers amount of backlash, which
must be between specification shown in chart.
MODEL
DIAL
INDICATOR
MINIMUM
READING
MAXIMUM
60 Big Foot,
60 SeaPro/Marathon
0.012 in.
(0.30mm)
0.019 in.
(.48mm)
75-thru-90
(3 Cylinder)
0.012 in.
(0.30mm)
0.019 in.
(.48mm)
100/115/125
(4 Cylinder)
0.015 in.
(0.38mm)
0.022 in.
(0.55mm)
9. If backlash is less than the minimum specification,
remove shim(s)* from in front of forward gear bear-
ing race to obtain correct backlash. When reinstal-
ling pinion nut, apply Loctite 271 on threads of nut.
10. If backlash is more than the maximum specifica-
tion, 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.
* By adding or subtracting 0.001 (0.025mm) shim, the back-
lash will change approximately 0.001 (.025mm).
Bearing Carrier and Propeller Shaft
Installation
1. Insert propeller shaft assembly into bearing
carrier.
2. Before installing bearing carrier assembly into
gear housing, obtain locally a 6 (152.4mm) long
by 1-1/4 – 1-1/2 (31.7 – 38.1mm) diameter
piece of PVC pipe (c). Install the PVC pipe over the
prop shaft (a) and secure the pipe against the
bearing carrier assembly (b) with the propeller nut
(d) and tab washer (e). This will allow the reverse
gear to apply pressure to the reverse gear thrust
bearing to prevent the thrust bearing from being in-
advertently dislodged as the bearing carrier
assembly is installed in the gear housing.
21043
a
b
c
d
e
3. Lubricate o-ring and mating surfaces with 2-4-C
w/Teflon (92-825407A12).
4. Install bearing carrier and propeller shaft into
housing with the word “TOP” located on flange to-
ward top of housing.
21044
a
b
c
a - Apply 2-4-C w/Teflon
b - O-ring
c-TOP
5. Install components as shown.
19147
b
a
a - Washers
b - Bolts; Apply Loctite 271 on Threads and Torque to 25 lb. ft.
(34.0 N·m)
NOTE: If nuts are used in place of bolts, torque nuts
to 25 lb. ft. (34.0 N·m).