BIGFOOT GEAR HOUSING
90-857046R1 NOVEMBER 2001 Page 6B-51
8. Grasp the driveshaft pre-load tool bolt head and lightly turn drive shaft back-and-forth
(no movement should be noticed at propeller shaft).
9. 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, 747cc/935cc)
0.012 in.
(0.30 mm)
0.019 in.
(.48 mm)
40/50/60 Bigfoot (4-Stroke, 995cc)
0.012 in.
(0.30 mm)
0.019 in.
(.48 mm)
75/90/115EFI (4-Stroke)
0.013 in.
(0.38 mm)
0.019 in.
(.55 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)
0.013 in.
(0.38 mm)
0.019 in.
(0.55 mm)
10. If backlash is less than the minimum specification, remove shim(s) from in front of for-
ward gear bearing race. If backlash is more than the maximum specification, add
shim(s) in front of forward gear bearing race. When reinstalling pinion nut, apply Loctite
271 on threads of nut.
NOTE:
By adding or subtracting 0.001 in. (0.025 mm) shim, the backlash will change
approximately 0.001 in.
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 holds the reverse gear and thrust bearing
tight against the bearing carrier preventing possible bearing damage during installation.
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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