6E-34 - LOWER UNIT
90-824052R3 JUNE 2002
Reverse Gear
DETERMINING REVERSE GEAR BACKLASH
NOTE: Reverse gear backlash is adjustable using
shims; it can be checked as follows:
1. Install Driver Tool (91-18605) into reverse gear
assembly.
2. Slide Pilot Ring (91-18603) over driver tool and
seat pilot ring against inner ledge in gear case.
3. Thread Retainer (91-18604) into gear case cover
nut threads.
4. Torque Screw (91-18602) to 45 Ib. in. (5.0 N·m)
against driver tool.
d
e
c
51884
a
b
a - Driver Tool (91-18605)
b - Pilot Ring (91-18603)
c - Inner Ledge
d - Retainer (91-18604)
e - Screw (91-18602) [Torque to 45 lb. in. (5.0 N·m)]
5. Thread stud adapter [from Bearing Preload Tool
(91-14311A1)] all the way onto stud.
6. Install: Backlash Indicator Tool (91-78473)
Dial Indicator Holder (91-89897)
Dial Indicator (91-58222A1)
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).
8. Lightly turn driveshaft back-and-forth (no
movement should occur at propeller shaft).
9. Dial Indicator registers amount of backlash,
which should be 0.030″ to 0.050″ (0.76mm to
1.27mm).
51880
d
e
a
b
c
a - Stud Adaptor (from 91-14311A1)
b - Stud
c - Backlash Indicator Tool (91-78473)
d - Dial Indicator Holder (91-89897)
e - Dial Indicator (91-58222A1)
f - Dial Indicator Pointer
NOTE: If reverse gear backlash is not within
specifications, then gear case is not properly
assembled or component(s) within gear case are
excessively worn and must be replaced before
returning gear case to service.
10. Remove Driver Tool, Pilot Ring, Retainer and
Screw from gear case.
Forward Gear
DETERMINING FORWARD GEAR BACKLASH
1. Install a load washer (12-37429) over a 44-93003
propeller shaft so that it seats against the REAR
shoulder of the clutch spline teeth.
b
a
c
55088
a - Load Washer (12-37429)
b - Shoulder
c - Propeller Shaft (44-93003)
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