6A-46 - LOWER UNIT 90-824052R3 JUNE 2002
10. If clearance is correct, leave Bearing Preload
Tool on drive shaft and proceed to “Determining
Forward Gear Backlash,” following.
11. If clearance is not correct, add (or subtract) shims
at location shown (Sport Master - place shims
under upper bearing race) to raise (or lower)
pinion gear. When reinstalling pinion nut, apply
Loctite 271 on threads of nut and re-torque pinion
nut.
c
a
d
c
a
b
24643
a - Pinion Gear Tool (91-74776 or 91-12349A2)
b - Feeler Gauge
c - Obtain 0.025
″ (0.64mm) Clearance between Shimming
Tool and Pinion Gear
d - Add or Subtract Shim(s) Here
NOTE: Bearing Preload Tool (91-14311A1) should
remain installed on driveshaft after setting pinion
gear depth as it is required to properly check forward
gear and reverse gear backlash.
DETERMINING FORWARD GEAR BACKLASH
NOTE: If working on a Sport Master gear case, you
may want to proceed to Determining Drive Shaft
End Play before checking forward gear backlash.
However, Forward and Reverse gear backlash can
be set before checking drive shaft end play.
IMPORTANT: Bearing carrier must be assembled
to provide a pilot for propeller shaft.
1. Insert propeller shaft into position in gear hous-
ing. (DO NOT place shift cam on propeller shaft.)
2. Place bearing carrier into gear housing and
thread cover nut tightly against bearing carrier. (It
is not necessary to torque cover nut against
bearing carrier.)
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 drive shaft 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 91-78473, if gear
ratio is 1.87:1 (15 teeth on pinion gear), or on line
marked “2” on Indicator Tool 91-78473, if gear
ratio is 2:1 (14 teeth on pinion gear). Position
pointer on line #1 of Indicator Tool 91-19660 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)
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