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MerCruiser R MR Alpha I Lower Gear housing See reference picture below! Fits all 1983-1990. |
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| Reference Number
see chart below |
Type | OE# | Part# |  |
| 1 | Prop Nut Kit | 11-52707AQ 1 | 65707 | |
| 2 | Prop thrust washer | 12-835467 1 | 4220 | |
| 3 | Carrier retainer nut | 79448 | 3751 | |
| 4 | Tab washer, small. Use with 65763, carrier casting #73020C 1 | 14-18323 | 2298 | |
| 4 | Tab washer, large. Use with 65020, carrier casting #73020C | 14-79447 | 2299 | |
| 5 | Prop shaft seal, 2 required | 26-76868 | 238 | |
| 6 | Bearing carrier assembly, casting #73020C 1 | 818763A10 | 65763 | |
| 6 | Bearing carrier assembly, casting #73020C | 73020A14 | 65020 | |
| 7 | Needle Bearing for carrier | 31-30956T | 18-1158 | |
| 8 | Ball Bearing | 30-88957T | 18-1155 | |
| 9 | Reverse thrust ring | 68100 1 | 64100 | |
| 10 | Complete gear set, this is the Gen II gear set with oe fwd gear Bearing to retrofit into the alpha I housing | updated replacement | 64086 | |
| 11 | Propeller Shaft | 44-824110 | 64110 | |
| 12 | Clutch dog | 52-853594T | 64594 | |
| 13 | Clutch dog pin | 17-30632 | 65632 | |
| 14 | Clutch dog spring | 24-30893 | 65893 | |
| 15 | forward gear needle Bearing | 31-30895T | 18-1157 | |
| 16 | Tapered roller Bearing | 31-35928T 1 | 18-1159 | |
| 17 | Shim Kit fwd gear, thru 95 | 15-47397A 1 | 18-2285 | |
| 18 | Shift spool assembly | 818349A 1 | 64349 | |
| 19 | Shift crank | 76858 | 65865 | |
| 20 | Pinion nut | 11-35921 | 18-3719 | |
| 21 | Pinion Bearing | 31-42647A 1 | 18-1117 | |
| 22 | Shift shaft | 77481 1 | 64481 | |
| 23 | Shift shaft bushing | 23-30617A 2 | 64617 | |
| 24 | Lower drive shaft | 45-42634 | 64634 | |
| 25 | Shim Kit drive shaft | 15-42637A 1 | 18-2294 | |
| 25 | Shim Kit drive shaft, for preloaded drive shaft | 15-57007A 1 | 18-2295 | |
| 26 | Tapered roller beaing drive shaft | 31-36387A 1 | 18-1143 | |
| 26 | Tapered roller Bearing drive shaft, for preloaded drive shaft | 31-36387A 1 | 18-1164 | |
| 27 | Drive shaft retainer nut, thru 97 | 824519 1 | 64519 | |
| 28 | Pump base, MR alpha 85-90, fits later style drives with flush screw in housing | 64-44292A 8 | 64292 | |
| 28 | Pump base, fits earlier style drives w/out flush screw in housing except 120, 140, 160 bodels, 70-84 | 64-57234A 1 | 64234 | |
| 29 | Impeller only, MC1 | 47-89984T 4 | 3017 | |
| 30 | Impeller Kit w/ housing, MC1 | 46-96148T 8 | 3517 | |
| 31 | Magnetic draincrew with gasket, MC1 | 22-67892A 1 | 64892 | |
| 32 | Trim tan Aluminum anode | 31640Q 4 | 70640 | |
| 32 | Trim tab zinc anode | 31640Q 4 | 6011Z | |
| 33 | Trim tab screw | 10-32470 | 62470 | |
| 34 | Drain / fill screw gasket 10 pack | 27-19183 3 | 64183 | |
| 35 | Lower seal Kit | 26-33144A 2 | 64144 | |
| 36 | Inlet screen kiy with screw and nut | 93423 1 / 93424 1 | 62684K | |
| not shown | Bearing Carrier Retainer Wrench | 91-91039T | 18-9858 | |
| not shown | Driveshaft (Drive Shaft) Retainer Nut Wrench | 91-43506T | 18-9842 | |
| not shown | Shift Shaft Bushing Tool | 91-31107T | 18-9817 | |
| not shown | Backish Indicator Rod | 91-53459 | 18-9850 | |
| not shown | Driveshaft (Drive Shaft) Preload Tool | 91-14311A 2 | 18-9874 | |
| not shown | Bearing Removal and Installation Assembly | 91-31229A 7 | 18-9820 | |
