MerCruiser Alpha One Gen II Gear Housing Diagram
Applicable for serial numbers 0L1000040 & Up
Ref
Part #
Note
Qty
Description
-
1623-815822A53
1
Complete gear housing assembly (1.94, 1.81, 1.62, 1.47)
-
1623-815822A55
1
Complete gear housing assembly (2.40, 2.00)
1
1623-815822A36
1
Gear housing assembly
2
821526
1
Filler block
3
17-37972 1
1
Shift crank pin
4
16-57984 1
1
Stud
10-806327
1
Screw
5
22-8M0058389
1
Drain screw
6
12-19183 3
1,2
1
Washer
7
26-45577 1
1,2
1
Seal
8
17-43044
1
Dowel pin
9
31-42647A1
1
Roller bearing
10
11-859135
1
Nut
11
45-853648
1
Driveshaft assembly
12
15-42637A1
AR
Shim kit
13
31-33138A1
1
Tapered roller bearing assembly
14
853651
1
Retainer
15
43-878087A2
1
Gear set (forward & pinion) (1.94, 1.81, 1.62, 1.47)
43-878617A2
1
Gear set (forward & pinion) (2.40, 2.00)
16
12-92721
1
Washer
17
11-35921
1
Nut (5/8-18)
18
817276 1
2
1
Face plate
19
807929A1
2
1
Carrier assembly
20
26-66302
1
2
Oil seal (serial # 0M400411 & below)
26-864319
1
Oil seal (serial # 0M400412 & up)
21
26-896523
1
1
O-ring (2.17 ID)
22
817275A1
2
1
Water pump assembly
23
27-43033 1
1
Lower gasket (old design - fiber)
27-8M0112903
1,2
1
Lower gasket (new design - nitrile coated stainless steel)
24
27-817277 1
1,2
1
Upper gasket
25
26-816575A2
1,2
1
Face seal
26
10-816928
4
Screw
27
47-43026T2
2
1
Impeller
28
28-8M0032833
2
1
Impeller key
29
816597A1
1
Coupling assembly
30
25-21836
1,2
2
O-ring
31
23-816583
1
Guide sleeve
32
8M0127949
1
Lower shift shaft
33
53-29641
1
Retaining ring
34
12-77674
1
Washer (1/8 inch thick)
35
23-815921A20
1
Shift shaft bushing assembly
36
26-89236 1
1
1
Oil seal
37
25-36318
1
2
O-ring (.799)
38
25-62702 1
1
1
O-ring (.301)
39
10-816928
2
Screw
40
8M2009865
1
Shift crank
41
818349T1
1
Shift spool assembly
42
15-44491A1
AR
Shim kit
43
31-30894A1
1
Tapered roller bearing assembly
44
-
1
Forward gear (see #15)
45
31-30895T
1
Roller bearing (Torrington #B-1616)
46
52-853594T
1
Sliding clutch
47
17-8M0100263
1
Cross pin
48
24-30893
1
Spring
49
44-850308
1
Propeller shaft
50
43-828073A1
1
Reverse gear (1.94, 1.81, 1.62, 1.47)
43-853593A1
1
Reverse gear (2.40, 2.00)
51
23-824108
1
Spacer
52
68100 1
1
Thrust ring
53
30-88957T
1
Ball bearing
54
25-31534
1
1
O-ring
55
818763A10
1
Bearing carrier
56
31-30956T
1
Roller bearing
57
26-14077
1
1
Inner oil seal (fishline cutter seal)
58
26-12224
1
1
Outer oil seal (fishline cutter seal)
59
806105Q1
1
Anode assembly
60
10-806290
2
Screw
61
13-69432
2
Lockwasher
62
14-18323
1
Tab washer
63
79448
1
Retaining ring
64
76214Q5
1
Trim tab (1.81,1.62, 1.47)
31640Q4
1
Trim tab (2.40, 2.00, 1.94)
65
10-806327
1
Screw
66
13-806210
1
Lockwasher
67
11-859135
4
Nut
68
10-65210
1
Screw
69
13-35479
1
Lockwasher
70
12-835467Q01
1
Thrust hub
71
12-31211Q03
1
Splined washer
72
14-816629Q
1
Tab washer
73
11-52707Q1
1
Propeller nut
74
13-42351 1
1
Washer
-
26-816575A3
-
Gear housing seal kit
-
817275Q05
-
Water pump repair kit
-
43-803073T1
3
-
Lower unit rebuild kit
-
43-803074T1
3
-
Lower unit rebuild kit (2.40)
-
31-803096T1
3
-
Seal & bearing kit
Note 1: Contents of seal kit QS-26-816575A3
Note 2: Contents of water pump repair kit 817275Q05
Note 3: Includes gears, bearings, shims, seals, clutch and prop nut to rebuild the lower unit
AR: As required