MerCruiser Alpha One Gen II Gear Housing Diagram
Applicable for serial numbers 0D469859 Thru OK999999
Ref
Part #
Note
Qty
Description
-
1623-815822A53
1
Gear housing assembly - complete
1
1623-815822A30
1
Gear housing assembly (serial # 0D469859 thru 0F679999)
1623-815822A36
1
Gear housing assembly (serial # 0F680000 & up)
2
821526
1
Filler block
3
17-37972 1
1
Shift crank pin
4
16-57984 1
1
Stud
5
22-67892A1
1
Screw
6
12-19183 3
1,2
1
Washer
7
26-45577
1,2
1
Seal
8
17-43044
2
Dowel pin
9
31-42647A1
1
Roller bearing
10
11-859135
1
Nut
11
45-816919
1
Driveshaft assembly (1.65, 1.62, 1.50, 1.47)
45-816472
1
Driveshaft assembly (2.40, 1.98, 1.94, 1.84, 1.81)
12
15-42637A1
AR
Shim kit
13
31-36387A1
1
Tapered roller bearing assembly
14
824519 1
1
Retainer
15
43-828072A4
1
Gear set (forward, pinion & reverse) (17/28 teeth)
43-878087A2
1
Gear set (forward, pinion & reverse) (13/21 teeth)
43-13730A1
1
Gear set (forward, pinion & reverse) (14/28 teeth)
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
2
2
Oil seal
21
25-90011
2
1
O-ring (2.17 ID)
22
817275A1
2
1
Water pump assembly
23
27-43033 1
1,2
1
Lower gasket
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
28-43037
2
1
Impeller key
29
816597A1
1
Coupling assembly
30
25-21836
1,2
2
O-ring
31
23-816583
1
Guide sleeve
32
815919A1
1
Lower shift shaft
33
53-29641
1
Retaining ring
34
23-67370
1
Sleeve
35
23-815921A21
1
Shift shaft bushing assembly
36
26-89236 1
1
1
Oil seal
37
25-36318
1
2
O-ring
38
10-816928
2
Screw
39
76865
1
Shift crank
40
818349T1
1
Shift spool assembly
41
15-47397A1
AR
Shim kit (serial # 0D469859 thru 0F679999)
15-44491A1
AR
Shim kit (serial # 0F680000 & up)
42
31-35928T1
1
Tapered roller bearing assembly (serial # 0D469859 thru 0F679999)
31-30894A1
1
Tapered roller bearing assembly (serial # 0F680000 & up)
43
-
1
Forward gear (see #15)
44
31-30895T
1
Roller bearing (Torrington #B-1616)
45
52-853594T
1
Sliding clutch
46
17-30632
1
Cross pin
47
24-30893
1
Spring
48
44-824110
1
Propeller shaft
49
43-824109A1
1
Reverse gear (28 teeth)
43-828073A1
1
Reverse gear (21 teeth)
50
23-824108
1
Spacer
51
68100 1
1
Thrust ring
52
30-88957T
1
Ball bearing
53
25-31534
1
1
O-ring
54
818763A10
1
Bearing carrier
55
31-30956T
1
Roller bearing
56
26-14077
1
1
Inner oil seal (Fishline cutter seal)
57
26-12224
1
1
Outer oil seal (Fishline cutter seal)
58
806105Q1
1
Anode assembly
59
10-806290
2
Screw
60
13-69432
2
Lockwasher
61
14-18323
1
Tab washer
62
79448
1
Retainer ring
63
76214Q5
1
Trim tab
31640Q4
1
Trim tab (1.98, 1.94)
64
10-806327
1
Screw
65
11-859135
4
Nut
66
10-65210
1
Screw
67
13-35479
1
Lockwasher
68
12-835467 1
1
Thrust hub
69
12-31211A3
1
Splined washer
70
14-816629
1
Tab washer
71
11-52707Q1
1
Propeller nut
72
12-42351 1
1
Washer
-
817275Q4
-
Water pump repair kit
-
26-816575A3
-
Gear housing seal kit
-
31-803094T1
3
-
Seal & bearing kit (serial # 0D469859 thru 0F679999)
-
31-803095T1
3
-
Seal & bearing kit (serial # 0F680000 & up)
-
43-803069T1
3
-
Lower unit rebuild kit (except 2.40 ratio) (serial # 0D469859 thru 0F679999)
-
43-803070T1
3
-
Lower unit rebuild kit (2.40 ratio only) (serial # 0D469859 thru 0F679999)
-
43-803071T1
3
-
Lower unit rebuild kit (except 2.40 ratio) (serial # 0F680000 & up)
-
43-803072T1
3
-
Lower unit rebuild kit (2.40 ratio only) (serial # 0F680000 & up)
Note 1: Contents of seal kit QS-26-816575A3
Note 2: Contents of water pump repair kit QS-817275Q4
Note 3: Rebuild kit includes all gears, shims, bearings, seals, clutch & prop nut to rebuild lower unit
AR: As required