Sierra Marine Parts Catalog
<< Previous of 1025 Next >>703
I/O—MERCRUISER-MR/ALPHAGearHousingComponents
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
1623-8951A37
1
2
Water Tube Guide
23-29804
1
3
Bushing/Water Pump Housing
26-38970
1
4
O-Ring, Upper Drive Shaft
25-30613
1
5
Slinger
25-30271
1
6
Stainless Steel Locknuts (5/16-24)
N/A
11-13436
1
Stainless Steel Locknuts (1/4-28)
N/A
11-13438
2
7
Washer
12-36001
3
8
Screw, Water Pump Body to
Water Pump Base
N/A
10-96411
1
9
Upper Pump Housing
46-96148A1
1
10
Insert Cup
48752
1
11
Impeller
47-89984
1
12
Gasket, Upper Water Pump
to Wear Plate
27-85609-1
1
13
Impeller Plate
32435
1
14
Gasket, Wear Plate to Water
Pump Base
27-85608-1
1
15
Water Pump Base
46-44292A3
1
16
Oil Seal (upper)
26-16977
1
17
Oil Seal (lower)
26-89238
1
18
O-Ring, Water Pump
25-90011
1
19
Gasket, Water Pump Base to
Gear Housing
27-42631-1
1
20
Retainer, Drive Shaft Bearing
824519
1
21
Tapered Roller Bearing Drive Shaft
31-36387A1
1
22
Shim Kit, Lower Drive Shaft Bearing
15-42637A1
1
23
Drive Shaft
45-42634
1
24
Drive Key Water Pump Impeller
N/A
28-56654
1
25
Shift Shaft Washer
12-29395
1
26
Washer Rubber Shift Shaft Bushing
12-31266
1
27
Shift Bushing
23-30617A2
1
28
O-Ring, Shift Shaft Bushing
25-25439
1
29
Washer, Lower Shift Shaft
NSS
12-27880
1
30
Retaining Clip, Shift Shaft
NSS
53-29641
1
31
Stainless Steel Shift Shaft
77481-1
1
32
Oil Passage Seal
26-45577
1
33
Dowel Pin, Gear Housing to Drive
Shaft Housing
10-30720
2
34
Screw, Gear Housing to Drive
Shaft Housing
10-30206
1
35
Nut, Gear Housing to Drive
Shaft Housing
18-2362
11-13439-1
2
36
Gasket, Gear Housing Drain Screw
12-19183,
12-20260
1
37
Plug, Oil Fill/Drain
10-79953A2
1
38
Insert, Water Pick (Stbd)
93423-1
1
39
Insert, Water Pick (Port)
93424-1
1
40
Screw, Insert to Gear Housing
10-76156
1
41
Nut, Insert Screw
11-45812
1
42
Trim Tab
31640A1
1
43
Screw, Trim Tab Gear Housing
10-32470
1
44
Pinion Bearing
31-42647A1
1
45
Lower Alpha Gear Set (pinion gear)
18-2206
43-17064A2,
43-17064A3,
43-42934
1
46
Anti-Galling Washer Pinion Gear
22-92721
1
47
Pinion Nut
11-35921
1
48
Shift Crank
76865
1
49
Shift Spool Assembly
818349A1
1
50
Shim Kit, Forward Gear
15-47397A1
1
51
Tapered Roller Bearing Set
31-35928A1
1
52
Inner Bearing. Forward Gear
31-30895
1
53
Retaining Clip, Inner Bearing
N/A
—
1
54
31-30895
1
55
Lower Alpha Gear Set
43-17064A2,
(Forward Gear/Pinion)
18-2206
43-17064A3,
43-42934
1
56
Spring, Retainer - Cross Pin
24-30893
1
57
Sliding Clutch
52-66063
1
58
Cross Pin, Clutch to Actuating Shaft
24-30893
1
59
Propeller Shaft
44-66060,
44-6606-3
1
60
Spacer, Reverse Gear
N/A
23-824108
1
61
Lower Alpha Gear Set
43-17064A2,
(Reverse Gea-NSS)
18-2206
43-17064A3,
43-42934
1
62
Thrust Ring, Bearing Carrier
68100-1
1
63
Ball Bearing
30-88957A1
1
64
O-Ring, Bearing Carrier
25-31534
1
65
Needle Roller Bearing
31-30956
1
66
Bearing Carrier
73020A-14
1
67
Oil Seals, Bearing Carrier
26-76868
2
68
Tab Washer
14-18323
1
69
Spanner Nut
79448
1
70
Thrust Washer
13171, 77987
1
71
Continuity Washer
N/A
13-423511
1
72
Brass Castle Washer
12-31211A2
1
73
Tab Washer
14-31210,
14-816629
1
74
Prop Nut
11-52707
1
N/A
Not Available
NSS
Not Sold Seperate