Mariner Mercury 105/140 JET, Service Manual

Page: 602 / 797

6B-46 - LOWER UNIT 90-824052R3 JUNE 2002
3. Position shim against shoulder in gear case.
51878
b
a
a - Shoulder
b - Shim
4. Insert entire propeller assembly into gear case.
5. Install tab washer and cover nut. Torque cover
nut to 100 Ib. ft. (135.5 N·m) to seat forward gear
assembly in gear case.
NOTE: Drill a 3/8
″
(22.2mm) diameter hole through
the side (PROPELLER NUT END) of a 5
″
x 2
″
(127mm x 50.8mm) long piece of PVC pipe. A
screwdriver may be inserted thru pipe into propeller
shaft splines to prevent PVC pipe from turning while
tightening retaining nut.
6. Install a 5
″
x 2
″
(127mm x 50.8mm) long piece of
PVC pipe (obtain locally) over propeller shaft and
secure it against the bearing carrier with a flat
washer and nut.
51882
a
d
f h
c
b
e
i
j
k
g
a - Prop Nut
b - Flat Washer
c - PVC Pipe [5
″
x 2
″
(127mm x 50.8mm)]
d - Cover Nut
e - Tab Washer
f - Bearing Carrier
g - Prop Shaft
h - Bearing Adaptor
i - Shim
j - Forward Gear
k - Load Washer
7. Tighten nut to 45 lb. in. (5.0 N·m). This will seat
the forward gear against the forward thrust
bearing and tends to hold the propeller shaft from
moving when measuring backlash.
NOTE: Bearing Preload Tool (91-44307A1) should
still be installed from having previously been used to
determine pinion gear depth and reverse gear
backlash. If it is not still installed on gear case, refer
to “DETERMINING PINION GEAR DEPTH,”
previously, for proper installation procedure.
8. With the proper preload applied to the propeller
shaft and the driveshaft, rotate the driveshaft
clockwise 5 to 10 complete revolutions. This will
seat the forward gear and upper driveshaft
bearings and thus provide the most accurate
backlash readings.
9. If not previously installed:
a. Thread stud adaptor [from Bearing Preload
Tool (91-44307A1)] all the way onto stud.
b. Install: Backlash Indicator Tool (91-78473)
Dial Indicator Holder (91-89897)
Dial Indicator (91-58222A1)
10. 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).
51880
e
a
b
c
f
d
a - Stud Adaptor (from 91-44307A1)
b - Stud
c - Backlash Indicator Tool (91-78473)
d - Dial Indicator Holder (91-89897)
e - Dial Indicator (91-58222A1)
f - Dial Indicator Pointer