Johnson/Evinrude Outboard Lower Gearcase Parts Diagram
The diagram below is applicable for the following models:
- 50 thru 75 HP - 1979 thru 2003
| Ref | Description | Sierra # | Replaces | Qty |
|---|---|---|---|---|
| 1 | Gearcase housing | - | 392478 | 1 |
| 2 | Trim tab | - | 318544 | 1 |
| 3 | Trim tab bolt | - | 313715 | 1 |
| 4 | Drain plug o-rings | 18-7145 | 333572 | 2 |
| 5 | Upper drain fill plug | 18-2387 | 307551 | 1 |
| 6 | Magnetic drain screw | 18-2378 | 318544 | 1 |
| 7 | Seal | 18-7475 | 332584 | 1 |
| 8 | Pinion retaining bolt | - | 324852 | 1 |
| 9 | Housing bolt | - | 308843 | 4 |
| 10 | Lockwasher | - | 306314 | 1 |
| 11 | Long gearcase bolt | - | 313697 | 1 |
| 12 | Anode bolt | - | 328096 | 1 |
| 13 | Lockwasher | - | 306470 | 1 |
| 14 | Short gearcase bolt | - | 306503 | 1 |
| 15 | Cavitation anode | 18-6024 | 436745 | 1 |
| 16 | Exhaust seal | 18-2537 | 324937 | 1 |
| 17 | Water inlet screen | - | 314175 | 1 |
| 18 | Shift shaft housing gasket | 18-2855 | 314082 | 1 |
| 19 | Shift shaft o-rings | 18-7137 | 318372 | 1 |
| 20 | Shift shaft housing | - | 388651 | 1 |
| 21 | SHift shaft housing bolt | 18-3133 | 302325 | 4 |
| 22 | Shift shaft | - | 327337 | 1 |
| 23 | Shift arm slinger | 18-2706 | 321008 | 1 |
| 24 | Propeller nut | 18-3705 | 314503 | 1 |
| 25 | Prop nut cotter pin | 18-3742 | 314502 | 1 |
| 26 | Prop nut spacer | 18-4228 | 315810 | 1 |
| 27 | Thrust washer | 18-4222 | 127084, 318841 | 1 |
| 28 | Carrier outer seal | 18-8326 | 330137 | 1 |
| 28 | Carrier inner seal | 18-2001 | 342787 | 1 |
| 29 | Carrier bearing (aft) | 18-1350 | 379504 | 1 |
| 30 | Carrier assembly | - | 434391 | 1 |
| 31 | Carrier anode | - | 306470 | 1 |
| 32 | Seal | 18-7475 | 332584 | 4 |
| 33 | Carrier to retainer bolt | 18-2379 | 320041 | 4 |
| 34 | Carrier anode bolt | - | 127466 | 2 |
| 35 | Carrier bearing (front) | 18-1351 | 382407 | 1 |
| 36 | Bearing housing o-ring | 18-7127 | 313446 | 1 |
| 37 | Retaining rings | - | 313445 | 2 |
| 38 | Carrier retaining plate | - | 313453 | 1 |
| 39 | Reverse gear large thrust washer | 18-0193 | 313447 | 1 |
| 40 | Reverse gear thrust bearing | 18-1366 | 382408 | 1 |
| 41 | Reverse gear | 18-2208 | 318304 | 1 |
| 42 | Reverse gear small thrust washer | - | 316484 | 1 |
| 43 | Prop shaft | 18-2250 | 439185, 439131 | 1 |
| 44 | Retaining spring | 18-2399 | 324369 | 1 |
| 45 | Sliding clutch | 18-2209 | 318303 | 1 |
| 46 | Clutch dog pin | 18-1714 | 313448 | 1 |
| 47 | Forward & pinion gear set | 18-2207 | 397338 | 1 |
| 48 | Forward gear thrust bearing | 18-1371 | 385043 | 1 |
| 49 | Forward gear thrust washer | 18-0198 | 324766 | 1 |
| 50 | Shifter shaft | - | 326668 | 1 |
| 51 | Shifter cradle | 18-3766 | 334163 | 1 |
| 52 | Shift lever | - | 324037 | 1 |
| 53 | Housing bearing | NSS | NSS | 1 |
| 54 | Bearing housing assembly | - | 391365 | 1 |
| 55 | Detent shift | - | 326670 | 1 |
| 56 | Detent ball | - | 327345 | 1 |
| 57 | Detent spring | - | 911961 | 1 |
| 58 | Shifter housing pin | - | 320145 | 1 |
| 59 | Housing pin | 18-3765 | 331880 | 1 |
| 60 | Pinion nut | - | 313339 | 1 |
| 61 | Pinion gear | NSS | NSS | 1 |
| 62 | Pinion bearing | 18-1356 | 382343 | 1 |
| 63 | Drive shaft (standard) | - | 437376 | 1 |
| 64 | Thrust bearing | - | 317230 | 1 |
| 65 | Thrust washer | 18-1367 | 385068 | 1 |
| 66 | Shim (.003) | 18-2232 | 323889 | AR |
| 66 | Shim (.004) | 18-2233 | 323890 | AR |
| 66 | Shim (.005) | 18-2234 | 317232 | AR |
| 67 | Bearing housing o-ring | 18-7128 | 313754 | 1 |
| 68 | Drive shaft retaining housing | - | 385087 | 1 |
| 69 | Drive shaft retaining bolt | - | 909386 | 4 |
| 70 | Seal | 18-8325 | 342786 | 1 |
| 71 | Water pump gasket | 18-2709 | 336530 | 1 |
| 72 | Impeller plate | 18-3127 | 341038 | 1 |
| 73 | Water pump housing seal | 18-7481 | 324981 | 1 |
| 74 | Impeller | 18-3053-1 | 396725 | 1 |
| 75 | Impeller key | 18-3138 | 334897 | 1 |
| 76 | Water pump housing liner | - | 321940 | 1 |
| 77 | Top plate liner | 18-3126 | 324980 | 1 |
| 78 | Water pump housing | 18-3129 | 435673 | 1 |
| 79 | Water pump housing bolt | 18-3133 | 302325 | 1 |
| 80 | Guide tube seal | 18-2703 | 314008 | 1 |
| 81 | Water tube guide | - | 319276 | 1 |
| 82 | Grommet | 18-2705 | 342786 | 1 |
| 83 | Guide tube screw | 18-3153 | 908158 | 1 |
| 84 | Gear housing seal kit | 18-2660 | 396349 | 1 |
| 85 | Complete water pump repair kit | 18-3389 | 432955 | 1 |
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