LEFT HAND NON-RATCHETING
90-855347R1 JANUARY 1999 Page 6B-41
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.
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 Nm) against driver tool.
51884
a
b
c
d
e
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 Nm)]
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).
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