Gen II Gear Case





Mercruiser Gen II Lower Gearcase Assembly Exploded View

Sierra

Mercruiser Gen II Lower Gearcase Assembly Exploded View
Mercruiser Lower Gearcase Assembly Exploded View Diagram and Parts
Fits Generation II
Figure # Description O.E.M. # Sierra #
1 Gear Housing 1623-815822A30
2 Sleeve 23-816573
3 Coupling 816597A1 18-3151
4 O-Rings 25-21836 18-7420
5 Face Seal 26-816575A2 18-2599
5A Screw, 10-32 X 5/8 10-806290 NSS
5B Star Washer 13-69432 NSS
6 Water Pump Body 817275A1
18-3147**
7 Impeller 47-43026-2 18-3056
8 Gasket 27-817277 18-2563
9 Face Plate 817276 18-3122
10 Gasket 27-43033-1 18-2564
11 Seal Carrier 821759A2/
807929A 1
18-2354
12 O-Rings 25-90011 18-7174
13 Seal 26-16977 18-2013
14 Seal 26-89238 18-2014
15 Cover Nut 824519 18-2346
16 & 17 Bearing, Upper Driveshaft (1.50-1.65 Ratio) 31-36387A 1 18-1143
16 & 17 Bearing, Upper Driveshaft (1:47-1:62 Ratio) 31-33138A 1 18-1193
18 Shim(s) 15-42637A 1 18-2294
19 Drive Shaft (1:47-1:62 Ratio) 45-853648 18-2331
SPECIAL
ORDER
815.726.4400
19 Drive Shaft (1.50-1.65 Ratio) 45-816919 18-2261
19 Drive Shaft (1.84-1.98 Ratio) 45-816472
20 Impeller Drive Key 28-43037 18-3293
21 Shift Shaft 815919A1 18-2320
22 Speedometer Pickup Fitting^ NSS
23 Sleeve 23-67370
24 Seal 26-89236 18-2009
25 Shift Rod Bushing Assembly 23-815921A21 18-2353
26 O-Rings 25-36318 18-7440
27 Retaining Ring 53-29641 18-4295
28 Dowel Pin 17-43044
29 Seal 26-45577 18-2944
30 Gasket 12-19183 18-2945
31 Plug 22-67892A1 18-2375
32 Pin 17-37972-1
33 Pinion Bearing 31-42647A1 18-1117
34 Pinion Gear 43-828072A2 SET ONLY
35 Washer 12-92721
36 Nut 11-35921 18-3719
37 Shift Crank 76865 18-2130
38 Shift Spool Assembly 818349A1 18-2286
38A 38A.Cotter Pin & Sleeve NSS 1
39 Retainer NSS 1
40 Washers NSS 1
41 Spring NSS 1
42 Shift Spool NSS 1
43 Clutch Shaft NSS 1
44 Shim(S) 15-47397A1 18-2285
45 & 46 Set, Cone & Race 31-35928T 1 18-1159
47 Forward Gear, Inner Bearing 31-30895  18-1157
47A 47A.Retaining Clip, Inner Bearing NSS
48 Forward Gear       NON STOCKED SEP
43-828072A2
49 Cross Pin Spring 24-30893 18-2348
50 Cross Pin 17-30632 18-2357
51 Sliding Clutch 52-824112 18-2202
52 Propeller Shaft 44-824110 18-2166
53 Reverse Gear   nss
43-828072A2 NSS
54 Thrust Ring 681001  18-2342
SPEC
ORDER
815.726.4400
55 Ball Bearing 30-88957A1 18-1155
56 O-Ring 25-31534 18-7159
57 Roller Bearing 31-30956 18-1158
58 Bearing Carrier 818763A10 18-2376

59 Seal 26-14077 18-2002
60 Seal 26-12224 18-2076
61 Tab Washer 14-18323 18-2298
62 Cover Nut 79448
8M2011027
18-3751
63 Thrust Hub 13171 18-4220
64 Continuity Washer 13-42351-1 NSS
65 Splined Washer 12-31211A2 18-3714
66 Tab Washer 14-31210 18-3200
67 Propeller Nut 11-52707 18-3700
68 Carrier Anode 806105A1 18-6093
Seal Kit (Not Pictured) 26-816575A3 18-2646-1




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