MerCruiser R Drives Gear Housing Diagram
Ref
Part #
Note
Qty
Description
-
1623-8951A43
1
Gear housing assembly - complete
1
1623-5356A4
1
Gear housing assembly
2
17-37972 1
1
Shift crank pin
3
16-46911
1
Stud (7/16-20 x 3-3/16”)
4
16-56298
2
Stud (7/16-20 x 1-31/32”)
5
26-45577 1
1,2
1
Seal
6
16-56297 2
1
Stud (5/16-24 x 3-3/8”)
7
16-69501
2
Stud (1/4-28 x 3-1/4”)
8
17-35973
2
Dowel pin
9
31-92366A1
1
Roller bearing
10
66885
1
Water pickup insert (starboard)
11
66884
1
Water pickup insert (port)
12
10-76156
1
Screw
13
11-45812
1
Nut
14
45-41939F 1
1
Driveshaft assembly
15
17-30545
1
Preload pin
16
24-34576
1
Spring
17
25-30613
1,2
1
Driveshaft o-ring
18
43-96084A7
1
Gear set (forward & pinion)
19
11-35921
1
Pinion nut
20
15-57007A1
AR
Shim kit
21
31-53079A1
1
Tapered roller bearing assembly
22
27-856704
1,2
1
Gasket (water pump to gear housing)
23
25-33145
1,2
1
O-ring
24
46-57234A1
1
Water pump base assembly
25
26-89238
1
1
Oil seal
26
26-16977
1
1
Oil seal
27
17-35973
2
Dowel pin
28
27-85608 1
1,2
1
Lower gasket
29
32435 1
2
1
Face plate
30
27-858524
1,2
1
Upper gasket
31
46-96148T1
2
1
Water pump body assembly
32
48752T
2
1
Insert
33
26-38970
2
1
Water inlet tube seal
34
47-89984T4
2
1
Impeller
35
28-56654
1
Impeller key
36
10-30720
1
Screw
37
12-36001
1
Washer
38
11-826708 9
2
Nut (1/4-28)
39
11-826709111
1
Nut (5/16-24)
40
12-29245
3
Washer
41
25-30271
2
1
Rubber ring
42
23-29804T
2
1
Guide sleeve
43
77481 1
1
Lower shift shaft
44
53-29641
1
Retaining clip
45
12-27880
1
Washer
46
25-25439
1
1
O-ring
47
23-30617A2
1
1
Shift shaft bushing assembly
48
26-89236 1
1
1
Oil seal
49
12-31266
1
1
Rubber washer
50
12-29395
1
Shift shaft washer
51
10-79953Q2
1
Screw
52
12-19183 3
1,2
1
Washer
53
18-46950
1
Cotter pin
54
818349T1
1
Shift spool assembly
55
76865
1
Shift crank
56
15-47397A1
AR
Shim kit
57
-
1
Forward gear (see #18)
58
31-30895T
1
Roller bearing
59
31-35928T1
1
Tapered roller bearing assembly
60
52-853594T
1
Sliding clutch
61
17-30632
1
Cross pin
62
24-30893
1
Spring
63
44-824110
1
Propeller shaft
64
43-92320T
1
Reverse gear
65
35915
1
Thrust ring
66
30-88957T
1
Ball bearing
67
15-97166
1
Shim
68
25-31534
1
1
O-ring
69
73020A14
1
Bearing carrier
70
31-30956T
1
Roller bearing
71
26-76868
1
2
Oil seal
72
28-30281
1
Key
73
14-79447
1
Tab washer
74
79448
1
Retainer ring
75
12-835467Q01
1
Thrust hub (use with Black Max props)
56292A4
1
Thrust hub (use with MC I props)
76
12-31211A3
1
Splined washer
77
14-816629
1
Tab washer
78
11-52707Q1
1
Propeller nut
79
31640Q4
1
Trim tab (2-3/8”)
34127T2
Opt
Trim tab (4”)
80
10-32470
1
Trim tab screw
81
10-30206
1
Screw
82
11-34933
2
Nut
83
13-42351 1
1
Lockwasher
-
26-33144A2
-
Gear housing seal kit
-
46-96148A8
-
Water pump repair kit
-
43-803079T1
3
-
Lower unit rebuild kit
-
31-803068T1
3
-
Seal & bearing kit
Note 1: Contents of seal kit QS-26-33144A2
Note 2: Contents of water pump repair kit QS-46-96148A8
Note 3: Rebuild kit includes all gears, shims, bearings, seals, clutch & prop nut to rebuild lower unit
AR: As required