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
—
1667-9011A73
1
2
Screw
—
10-8248327
4
3
Washer
12-29245
4
4
Insulator
18-0568
23-43045
4
5
Water Pump Housing
817275A2
1
6
Impeller
47-430262
1
7
Impeller Key
28-43037
1
8
Gasket
27-817277
1
9
Face Plate
817276
1
10
Gasket
27-430331
1
11
Screw
—
10-824832-6
6
12
Washer
12-29245
6
13
Pump Base
—
43055A4
1
14
Seal
26-43035
1
15
Seal
26-43036
1
16
Gasket
27-430472
1
17
Carrier w/Bearing
—
43040A1
1
18
Tube, Oiler
—
43046
1
19
Sleeve
—
42461A1
1
20
Ring
—
42461A1
1
21
Drive Shaft
—
45-43031A1
1
22
Shim Assembly
—
15-44492A1
AR
23
Race (sold with #24)
31-42677A1
1
24
Bearing (sold with #23)
31-42677A1
1
25
Pinion Gear
—
43-44484
1
26
Pinion Nut
11-35921
1
27
Seal
26-8164641
1
28
Bushing Assembly
—
23-43052A4
1
29
Screw
—
10-824832-6
2
30
O-Ring
25-45710
1
31
E-Ring
53-29641
1
32
Shift Shaft
—
43048A1
1
33
Gasket
12-19183
3
34
Plug
—
10-28653
1
35
Plug
10-79953
1
36
Plug
22-67892A1
1
37
Trim Tab
31640A1
1
38
Bolt, Anode Mounting
—
10-15942
1
39
Washer, Anode Mounting
18-4858-9
12-45176
1
40
Shim Cam
—
76039
1
41
Shim Assembly
—
15-44491A1
AR
42 & 43
Bearing & Race
13-30894A1
1
44
Roller Bearing
31-30895
1
45
Forward Gear
—
43-12634A2
1
46 & 47
Cam Follower Assembly
—
12239A1
1
48
Ball Bearing
—
30-44530
3
49
Spring
—
24-30622
1
50
Clutch
52-822539
1
51
Cross Pin
17-30632
1
52
Spring
24-30893
1
53
Prop Shaft
—
44-12238T
1
54
Reverse Gear
—
43-12635
1
55
O-Ring
25-97386
1
56
Thrust Bearing
31-12576
1
57
Thrust Washer
12-12577
1
58
Roller Bearing
31-12578
1
59
Bearing Carrier
—
12596A2
1
60
Washer
—
12-70132
2
61
Nut
—
11-401198
2
62
Roller Bearing
31-30956
1
63
Seal
26-76868
1
64
Seal
26-70081
1
65
Thrust Washer
13191A1
1
66
Tab Washer
14-31210
1
67
Prop Nut
11-52707
1
AR
As required