Pinion Gear Location And Forward Gear Backlash - Mercury 40 Service Manual

Pinion Gear Location and Forward
Gear Backlash
DETERMINING PINION GEAR LOCATION
NOTE: Read entire procedure before attempting any
change in shim thickness.
IMPORTANT: Forward gear assembly must be in-
stalled in gear housing when checking pinion
gear depth to obtain accurate shim measure-
ments.
1. Clean the gear housing bearing carrier shoulder
and diameter.
2. Position gear housing upright (driveshaft verti-
cal). Install Bearing Preload Tool in sequence
shown.
i
f
a - Plate
b - Adaptor: Bearing surfaces clean and free of nicks
c - Thrust Bearing: Oiled and able to move freely
d - Thrust Washer: Clean and free of nicks and bends
e - Spring
f - Nut: Threaded all the way onto bolt
g - Bolt: Held snug against spring
h - Sleeve: Holes in sleeve must align with set screws
i - Set Screw (2): Tighten against drive shaft, bolt should not
slide on driveshaft
90-852572R1 JANUARY 1998
3. Measure distance.
4. Increase distance by 1 in. (25.4mm).
5. Rotate driveshaft 10 revolutions. This properly
h
3/4 in. (19mm) I.D.
i
a - Distance, 1 in. (25.4 mm)
b - Bolt
c - Nut
g
6. Insert Pinion Location Tool. Position access hole
e
d
c
b
a
a - Pinion Location Tool (91-817008A2)
51270
b - Access Hole
c - Gauging Surface
d - Pinion Gear
seats upper driveshaft tapered roller bearing.
c
b
as shown. Insert feeler gauge between gauging
surface and pinion gear.
a c
b
a
19884
d
51265
LOWER UNIT - 6B-25