BIGFOOT GEAR HOUSING
90-828631R3 MARCH 1999 Page 6B-51
7. Lightly turn driveshaft back-and-forth (no movement 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
40/50 Bigfoot
(4-Stroke)
0.012 in.
(0.30 mm)
0.019 in.
(.48 mm)
60 Bigfoot
0.012 in.
(0.30 mm)
0.019 in.
(.48 mm)
75-thru-90
(3 Cylinder)
0.012 in.
(0.30 mm)
0.019 in.
(.48 mm)
100/115/125
(4 Cylinder)
0.015 in.
(0.38 mm)
0.022 in.
(0.55 mm)
9. If backlash is less than the minimum specification, remove shim(s)* from in front of for-
ward gear bearing race to obtain correct backlash. When reinstalling pinion nut, apply
Loctite 271 on threads of nut.
10. If backlash is more than the maximum specification, 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 in. (0.025 mm) shim, the backlash will change
approximately 0.001 in. (.025 mm).
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 in. (152.4
mm) long by 1-1/4 in. – 1-1/2 in. (31.7 – 38.1 mm) diameter piece of PVC pipe. Install
the PVC pipe over the prop shaft and secure the pipe against the bearing carrier assem-
bly with the propeller nut and tab washer. This will allow the reverse gear to apply pres-
sure to the reverse gear thrust bearing to prevent the thrust bearing from being inadver-
tently dislodged as the bearing carrier assembly is installed in the gear housing.
21043
d
a
b
c
e
a-Bearing Carrier Assembly
b-PVC Pipe
c-Propeller Nut
d-Prop Shaft
e-Tab Washer
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