Forward Gear Bearing Race; Trim Tab Adjustment And Replacement; Reassembly; Shift Shaft - Mercury 45 Jet 50-55 Service Manual

Forward Gear Bearing Race

IMPORTANT: Retain shim(s) for reassembly. If
shims are damaged, replace with new shims of
equal thickness.
1. Remove race and
Hammer (91-34569A1).
a
b
a - Race
b - Shim(s)
Trim Tab Adjustment and
Replacement
IMPORTANT: The trim tab is now painted and does
NOT aid in protecting the drive shaft housing and
gear housing from galvanic corrosion (corrosion
and pitting of metal surfaces). Side anodes now
provide protection. Do not paint or place protec-
tive coating on the side anodes, or corrosion
protection function will be lost.
1. Replace trim tab if damaged. Mark location of old
trim tab on anti-ventilation plate before removal;
install new trim tab in same location.
2. The trim tab provides a means to offset (balance)
some of the steering load that is caused by propel-
ler torque at higher operating speeds. If at higher
speeds the boat turns more easily to the left, loos-
en bolt, move the trim tab (trailing edge) to the left
(when viewed from behind); retighten bolt. Turn
trim tab (trailing edge) to the right if the boat turns
more easily to the right.
c
b
a - Trim Tab
b - Anti-Ventilation Plate
c - Retaining Bolt and Washer; Torque Bolt to 22 lbs. ft.
(29.8 N
m)
6B-18 - LOWER UNIT
shim(s) using Slide
c
27653
c - Slide Hammer
(91-34569A1)
a
53931

Reassembly

Forward Gear Bearing Race
1. Place shim(s) (retained from disassembly) into
housing. If shim(s) were lost, or a new gear hous-
ing is being assembled, start with 0.010I
(0.254mm) shim(s).
2. Assemble components as shown; drive race into
housing by striking propeller shaft end with lead
hammer.
d
e
a - Shim(s)
b - Race, Apply 2-4-Cw/Tefl-
on Lubricant on O.D.
c - Mandrel (91-31106)

Shift Shaft

1. Apply Loctite 271 on O.D. of new seal.
2. Press seal into shift shaft bushing until seal is
seated against shoulder.
3. Install new O-ring.
4. Apply 2-4-C with Teflon on O-ring and I.D. of seal.
c
d
a - Seal
b - Bushing
c - Surface
d - O-ring
c
a
b
19179
d - Disassembled Propeller
Shaft
e - Assembled Bearing
Carrier
a
b
53930
90-817643R1 DECEMBER 1996