Sierra Marine Parts Catalog
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OUTBOARD—MERCURY/MARINER-GearcaseAssembly
Gearcase 50-75 HP 3 Cyl 1979-2003
Figure
#
Description
Part #
O.E.M. #
Qty.
Figure
#
Description
Part #
O.E.M. #
Qty.
1
Gear Housing
—
1643-9539A1
1
2
Dowel Pin
—
17-85500
2
3
Shift Shaft
—
76163A1
1
4
E-Clip
53-29641
1
5
O-Ring
25-21836
1
6
Shift Shaft Bushing
23-77631A2
1
7
Seal
26-816461
1
8
Washer
12-77674
1
9
Reverse Lock Base
—
78036
1
10
Reverse Lock Cam
—
433081
1
11
Stud
—
16-33778
3
12
Stud
—
16-57933
2
13
Pinion Nut
—
11-55910
1
14
Pinion Gear
—
43-98097
1
15
Roller Bearing
—
31-62091
1
16
Sleeve
—
88181
1
17
Shim Set
—
15-92881A1
AR
18
Tapered Bearing
—
31-77420A1
1
19
Drive Shaft
—
45-981801
1
20
Spring
—
24-20254
1
21
Pin
—
17-30545
1
22
Gasket
27-19552
1
23
O-Ring
25-26722
1
24
Seal
26-79831
1
25
Seal
26-90562
1
26
Water Pump Base
46-77177A1
1
27 & 28
Pin, Dowel
—
17-35973
1
29
Gasket
27-19553
1
30
Face Plate
54705
1
31
Key
—
28-56662
1
32
Gasket
27-19551
1
33
Impeller
47-89983
1
34
Insert
48753
1
35
Water Pump body
46-77822A1
1
36
Nylon Washer
—
12-38453
1
37
Seal
—
26-38452
1
38
Slinger
—
25-20273
1
39
Washer
12-29245
3
40
Nut
—
11-13438
3
41
Trim Tab
31640A1
1
42
Screw
—
10-66024
1
43
Support Plate
—
92815
1
44
Exhaust Tube Seal
37721
1
45
Drain Plug
10-79953
2
46
Washer
12-19183
2
47
Flush Plug
—
19-48750
1
48
Flush Plug Washer
12-492211
1
49
Nut
11-34933
1
50
Nut
—
1134863
1
51
Washer
—
12-65791
1
52
Washer
—
12-45175
1
53
Shift Cam
—
76039
1
54
Shim Set
—
15-38374A1
AR
55
Tapered Roller Bearing
31-38356A1
1
56
Roller Bearing
31-21739
1
57
Forward Gear
—
43-55608A4
1
58
Cam Follower
—
38441
1
59
Slide
—
20843
1
60
Spring
—
24-38114
1
61
Cross Pin
—
17-38113
1
62
Clutch
—
52-92911
1
63
Spring
—
24-39845
1
64
Prop Shaft
—
44-75365
1
65
Reverse Gear
—
43-79158
1
66
Thrust Washer
—
12-32004
1
67
Shim Set
—
15-20927A1
AR
68
Ball Bearing
30-20839T
1
69
O-Ring
2531986
1
70
Bearing Carrier
—
69386A1
1
71
Key
—
28-30281
1
72
Roller Bearing
3121700
1
73
Seal
26-69188,
26-619189
1
74
Tab Washer
—
14-53012
1
75
Cover Nut
—
11-87763
1
76
Thrust Hub
73345A1
1
77
Thrust Hub
14-76281
1
78
Tab Washer
14-76281
1
79
Nut
11-69578A
1
80
Gear Housing Seal Kit
26-79831A1
1
81
Water Pump Repair Kit
46-77177A3
1
AR
As required