Mariner Mercury 105/140 JET, Service Manual

Page: 681 / 797

90-824052R3 JUNE 2002 LOWER UNIT - 6D-29
4. With tool installed over driveshaft, tighten both
set screws securely, making certain to align
sleeve holes to allow set screws to pass thru.
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
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 and proceed to “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 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
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.)