Page 857 - 2021 Sierra Catalog

I/O — MERCRUISER - MR/ALPHA Gear Housing Components
Figure # Description Part #
OEM # Qty. Figure # Description Part # OEM # Qty.
Gear Housing
Water Tube Guide Bushing/Water Pump Housing O-Ring, Upper Drive Shaft
1623-8951A37 1 23-29804 1 26-38970 1 25-30613 1 25-30271 1 11-13436 1 11-13438 2 12-36001 3 10-96411 1
46-96148A1 1 48752 1 47-89984 1 27-85609-1 1
32435 1 27-85608-1 1
46-44292A3 1 26-16977 1 26-89238 1 25-90011 1 27-42631-1 1
824519 1 31-36387A1 1
15-42637A1 1
45-42634 1 28-56654 1 12-29395 1 12-31266 1
23-30617A2 1 25-25439 1 12-27880 1 53-29641 1 77481-1 1 26-45577 1 10-30720 2
10-30206 1
11-13439-1 2
N/A Not Available
Drain Screw Gasket
Drain Screw
Insert, Water Pick (Stbd)
Insert, Water Pick (Port)
Screw, Insert to Gear Housing
Nut, Insert Screw
Trim Tab
Screw, Trim Tab Gear Housing
Pinion Bearing
18-2945 12-19183, 1 12-20260
18-2244 10-79953A2 1 18-3199 93423-1 1 118-3198 93424-1 1 18-3197 10-76156 1 18-2344 11-45812 1 18-6011 31640A1 1 18-6245 10-32470 1 18-1117 31-42647A1 1 18-2206 43-17064A2, 43- 1
1
2
3
4
5 Slinger 18-7426
18-2401 18-3109 18-3110 18-7158
36
37 38 39 40 41 42 43 44 45
17064A3, 43-42934
18-2343 22-92721 1 18-3719 11-35921 1 18-2130 76865 1 18-2286 818349A1 1 18-2285 15-47397A1 1 18-1159 31-35928A1 1 18-1157 31-30895 1 N/A — 1 54 18-1157 31-30895 1
Stainless Steel Locknuts (5/16-24) Stainless Steel Locknuts (1/4-28)
6
7 Washer 18-4270
N/A N/A
8
9
10
11 Impeller 18-3017
Screw, Water Pump Body to Water Pump Base
N/A
Upper Pump Housing Insert Cup
18-3116 18-3114
Lower Alpha Gear Set (pinion gear)
12
13 14
15 16 17 18 19
20 21
22
23 24 25 26
27 28 29 30 31 32 33
34 35
Gasket, Upper Water Pump to Wear Plate
Impeller Plate
Gasket, Wear Plate to Water Pump Base
Water Pump Base
Oil Seal (upper)
Oil Seal (lower)
O-Ring, Water Pump
Gasket, Water Pump Base to Gear Housing
Retainer, Drive Shaft Bearing
Tapered Roller Bearing Drive Shaft
Shim Kit, Lower Drive Shaft Bearing
Drive Shaft
Drive Key Water Pump Impeller
Shift Shaft Washer
Washer Rubber Shift Shaft Bushing
Shift Bushing
O-Ring, Shift Shaft Bushing
Washer, Lower Shift Shaft
Retaining Clip, Shift Shaft
Stainless Steel Shift Shaft
Oil Passage Seal
Dowel Pin, Gear Housing to Drive Shaft Housing
Screw, Gear Housing to Drive Shaft Housing
Nut, Gear Housing to Drive Shaft Housing
18-2915
18-3117 18-2914
18-3420 18-2013 18-2014 18-7176 18-2919
18-2346 18-1143
18-2294
18-2180 N/A 18-4267 18-2340
18-2154 18-7153 NSS NSS 18-2150 18-2944 18-3226
18-2361 18-2362
46 47 48 49 50 51 52 53
Anti-Galling Washer Pinion Gear Pinion Nut
Shift Crank
Shift Spool Assembly
Shim Kit, Forward Gear Tapered Roller Bearing Set Inner Bearing. Forward Gear Retaining Clip, Inner Bearing
55
56 57 58
59 60 61
62 63 64 65 66 67 68 69 70 71 72 73 74
Lower Alpha Gear Set (Forward Gear/Pinion)
Spring, Retainer - Cross Pin Sliding Clutch
Cross Pin, Clutch to Actuating Shaft
Propeller Shaft Spacer, Reverse Gear
Lower Alpha Gear Set (Reverse Gea-NSS)
Thrust Ring, Bearing Carrier Ball Bearing
O-Ring, Bearing Carrier Needle Roller Bearing Bearing Carrier
Oil Seals, Bearing Carrier Tab Washer
Spanner Nut
Thrust Washer Continuity Washer
Brass Castle Washer Tab Washer
Prop Nut
Not Sold Seperate
18-2206 43-17064A2, 1 43-17064A3, 43-42934
18-2348 24-30893 1 18-2202 52-66063 1 18-2357 24-30893 1
18-2166 44-66060, 44-6606-3 1 N/A 23-824108 1 18-2206 43-17064A2, 1
43-17064A3, 43-42934 18-2342 68100-1 1 18-1155 30-88957A1 1 18-7159 25-31534 1 18-1158 31-30956 1 18-2191 73020A-14 1 18-2002 26-76868 2 18-2298 14-18323 1 18-3751 79448 1 18-4220 13171, 77987 1 N/A 13-423511 1 18-3714 12-31211A2 1 18-3200 14-31210, 14-816629 1 18-3700 11-52707 1
NSS
839