Sierra Marine Parts Catalog

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