Sierra Marine Parts Catalog
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I/O—MERCRUISER-GenerationIILowerGearcaseAssembly
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
1623-815822A36
1
2
Sleeve
—
23-816573
1
3
Coupling
816597A1
1
4
O-Rings
25-21836
2
5
Face Seal
26-816575A2
1
6
Screw, 10-32 X 5/8
NSS
10-806290
4
7
Star Washer
NSS
13-69432
4
8
Water Pump Body
817275A1
1
9
Impeller
47-43026-2
1
10
Gasket
27-817277
1
11
Face Plate
817276
1
12
Gasket
27-43033-1
1
13
Seal Carrier
821759A2
1
14
O-Ring
25-90011
1
15
Seal
26-16977
1
16
Seal
26-89238
1
17
Cover Nut
824519
1
18 & 19
Bearing, Upper Driveshaft
(1.50-1.65 Ratio)
31-36387A1
1
Bearing, Upper Driveshaft
(1.47-1.62 Ratio)
31-33138A1
1
20
Shim Kit
15-42637A1
1
21
Drive Shaft (1:47 & 1:62)
45-853648
1
Drive Shaft (1:50 & 1:65)
45-816919
1
Drive Shaft (1:84 & 1:98)
(Early Style use with 18-1143)
—
45-816472
1
22
Impeller Drive Key
28-43037
1
23
Shift Shaft
815919A1
1
24
Sleeve
23-67370
1
25
Seal
26-89236
1
26
Shift Rod Bushing Assembly
23-815921A21
1
27
Screw, 10-32 X 5/8
NSS
10-806290
2
28
Star Washer
NSS
13-69432
2
29
Speedometer Pickup Fitting
—
NSS
1
30
O-Ring
25-36318
1
31
O-Ring
25-36318
1
32
Retaining Ring
53-29641
1
33
Dowel Pin
—
17-43044
1
34
Stud, Mounting
—
16-57984
1
35
Seal
26-45577
1
36
Dowel Pin
—
17-43044
1
37
Plug
22-67892A1
1
38
Gasket
12-19183
1
39
Trim Tab
76214A5
1
40
Washer, Anode Mounting
—
13-806210
1
41
Bolt, Anode Mounting
—
10-806327
1
42
Pinion Bearing
31-42647A1
1
43
Pinion Gear
18-2206
43-828072A2
1
44
Washer
12-92721
1
45
Nut
11-35921
1
46
Pin
—
17-37972-1
1
47
Shift Crank
76865
1
48
Shift Spool Assembly
818349A1
1
49
Shim Kit
15-47397A1
1
50 & 51
Forward Gear, Outer Bearing
31-35928A1
1
52
Retaining Clip, Inner Bearing
NSS
—
1
53
Forward Gear, Inner Bearing
31-30895
1
54
Forward Gear
18-2206
43-828072A2
1
55
Cross Pin Spring
24-30893
1
56
Sliding Clutch
52-824112
1
57
Cross Pin
17-30632
1
58
Propeller Shaft
44-824110
1
59
Spacer
—
23-824108
1
60
Reverse Gear
18-2206
43-828072A2
1
61
Thrust Ring
681001
1
62
Ball Bearing
30-88957A1
1
63
O-Ring
25-31534
1
64
Roller Bearing
31-30956
1
65
Bearing Carrier
818763A10
1
66
Seal
26-14077
1
67
Seal
26-12224
1
68
Carrier Anode
806105A1
1
69
Lockwasher, Anode Mounting
—
13-69432
2
70
Bolt, Anode Mounting
—
10-806290
2
71
Tab Washer
14-18323
1
72
Cover Nut
79448
1
73
Thrust Hub
13171
1
74
Continuity Washer
NSS
13-42351-1
1
75
Splined Washer
12-31211A2
1
76
Tab Washer
14-31210
1
77
Propeller Nut
11-52707
1
Seal Kit (Not Pictured)
26-816575A3
1
NSS
Not Sold Seperate