Mercury Outboard Lower Gearcase Parts Diagram
The diagram below is applicable for the following models:
- 70, 75, 80 & 90 HP - serial # OA996142 & up
- 100, 115 & 125 HP, 4 Cylinder - serial # OB206468 & up
| Ref | Description | Part # | Replaces | Qty |
|---|---|---|---|---|
| 1 | Gear housing | - | 1667-9011A73 | 1 |
| 2 | Screw | - | 10-8248327 | 4 |
| 3 | Washer | 18-4275 | 12-29245 | 4 |
| 4 | Insulator | 18-0568 | 23-43045 | 4 |
| 5 | Water pump housing | 18-3572 | 817275A2 | 1 |
| 6 | Impeller | 18-3056 | 47-430262 | 1 |
| 7 | Impeller key | 18-3293 | 28-43037 | 1 |
| 8 | Gasket | 18-2566 | 27-817277 | 1 |
| 9 | Face plate | 18-3122 | 817276 | 1 |
| 10 | Gasket | 18-2564 | 27-430331 | 1 |
| 11 | Screw | - | 10-824832-6 | 6 |
| 12 | Washer | 18-4275 | 12-29245 | 6 |
| 13 | Pump base | - | 43055A4 | 1 |
| 14 | Seal | 18-0583 | 26-43035 | 1 |
| 15 | Seal | 18-0522 | 26-43036 | 1 |
| 16 | Gasket | 18-2565 | 27-430472 | 1 |
| 17 | Carrier w/bearing | - | 43040A1 | 1 |
| 18 | Oiler tube | - | 43046 | 1 |
| 19 | Sleeve | - | 42461A1 | 1 |
| 20 | Ring | - | 42461A1 | 1 |
| 21 | Drive shaft | - | 45-43031A1 | 1 |
| 22 | Shim assembly | - | 15-44492A1 | AR |
| 23 | Race (sold with #24) | 18-1118 | 31-42677A1 | 1 |
| 24 | Bearing (sold with #23) | 18-1118 | 31-42677A1 | 1 |
| 25 | Pinion gear | - | 43-44484 | 1 |
| 26 | Pinion nut | 18-3719 | 11-35921 | 1 |
| 27 | Seal | 18-2054 | 26-8164641 | 1 |
| 28 | Bushing assembly | - | 23-43052A4 | 1 |
| 29 | Screw | - | 10-824832-6 | 2 |
| 30 | O-ring | 18-7198 | 25-45710 | 1 |
| 31 | E-ring | 18-4295 | 53-29641 | 1 |
| 32 | Shift shaft | - | 43048A1 | 1 |
| 33 | Gasket | 18-2945 | 12-19183 | 3 |
| 34 | Plug | - | 10-28653 | 1 |
| 35 | Plug | 18-2244 | 10-79953 | 1 |
| 36 | Plug | 18-2375 | 22-67892A1 | 1 |
| 37 | Trim tab | 18-6011 | 31640A1 | 1 |
| 38 | Anode mounting bolt | 18-6245 | 10-15942 | 1 |
| 39 | Anode mounting washer | 18-4858-9 | 12-45176 | 1 |
| 40 | Shim cam | - | 76039 | 1 |
| 41 | Shim assembly | - | 15-44491A1 | AR |
| 42/43 | Bearing & race | 18-1156 | 13-30894A1 | 1 |
| 44 | Roller bearing | 18-1157 | 31-30895 | 1 |
| 45 | Forward gear | - | 43-12634A2 | 1 |
| 46/47 | Cam follower assembly | - | 12239A1 | 1 |
| 48 | Ball bearing | - | 30-44530 | 3 |
| 49 | Spring | - | 24-30622 | 1 |
| 50 | Clutch | 18-2236 | 52-822539 | 1 |
| 51 | Cross pin | 18-2357 | 17-30632 | 1 |
| 52 | Spring | 18-2348 | 24-30893 | 1 |
| 53 | Prop shaft | - | 44-12238T | 1 |
| 54 | Reverse gear | - | 43-12635 | 1 |
| 55 | O-ring | 18-7961 | 25-97386 | 1 |
| 56 | Thrust bearing | 18-1112 | 31-12576 | 1 |
| 57 | Thrust washer | 18-1191 | 12-12577 | 1 |
| 58 | Roller bearing | 18-1113 | 31-12578 | 1 |
| 59 | Bearing carrier | - | 12596A2 | 1 |
| 60 | Washer | - | 12-70132 | 2 |
| 61 | Nut | - | 11-401198 | 2 |
| 62 | Roller bearing | 18-1158 | 31-30956 | 1 |
| 63 | Seal | 18-2002 | 26-76868 | 1 |
| 64 | Seal | 18-2053 | 26-70081 | 1 |
| 65 | Thrust washer | 18-4221 | 13191A1 | 1 |
| 66 | Tab washer | 18-3200 | 14-31210 | 1 |
| 67 | Prop nut | 18-3700 | 11-52707 | 1 |
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