6B-42 - LOWER UNIT 90-824052R3 JUNE 2002
5. Measure distance (a) and increase that distance
by 1″ (25.4mm) by turning bottom nut away from
top nut.
a
1 in. (25.4mm)
a
b
51870
a - Adaptor
b - Ledge
6. Turn driveshaft clockwise 2 or more turns to seat
driveshaft bearings.
7. Insert Pinion Gear Locating Tool* (91-74776) into
gear housing until it bottoms out on bearing
carrier shoulder.
*Pinion Gear Locating Tool (91-12349A2) can be
used. Use flat #7 and disc #2. Follow instructions
supplied with tool.
8. Determine pinion gear depth by inserting a feeler
gauge thru access slot in pinion gear shimming
tool.
9. Clearance between shimming tool and pinion
gear should be 0.025″ (0.64mm).
10. If clearance is correct, leave Bearing Preload
Tool on driveshaft for “Determining Forward
Gear Backlash,” following.
11. If clearance is not correct, add (or subtract) shims
at location shown 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 Shimming 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. However, if
rebuilder wants to set driveshaft end play next, the
preload tool will need to be removed.
SETTING/CHECKING DRIVESHAFT END PLAY
(SPORT MASTER ONLY)
1. With pinion height set in previous step, remove
the preload tool from the driveshaft.
2. Remove the upper bearing cup retainer with tool
91-43506, and remove cup [leave upper cup
shim(s) in place].
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