OMC Cobra Stern Drive Upper Housing Diagram
| Ref # | Description | Part # | Replaces |
|---|---|---|---|
| Upper Gear Housing Complete, 2.5L,3.0L,5.0L | 18-4805 | 984771, 986382 | |
| Upper Gear Housing Complete, 4.3L | 18-4806 | 984765, 986380 | |
| Upper Gear Housing Complete, 5.7L, 5.8L | 18-4804 | 984770, 986381 | |
| 1 | Upper Gear Housing, Basic w/ Inserts | - | 984518 |
| 2 | Gearcase Insert | NSS | 910935 |
| 3 | Gearcase Insert | NSS | 911779, 3852541 |
| 4, 6, 7 | Gearcase Insert | NSS | 910901 |
| 5 | Gearcase Insert | NSS | 911858, 3852567 |
| 8 | Shift Rod Guide | NSS | 912137 |
| 9 | Water Passage Cover | 18-0884 | 911734 |
| 10 | Gasket, Water Passage Cover | 18-4837 | 911733 |
| 11 | Thrust Plate, Starboard | NSS | 911838, 3852562 |
| 12 | Shim, Thrust Plate, 0.015" | 18-1713 | 911839, 3852563 |
| 13 | Thrust Plate, Port | NSS | 911837, 3852561 |
| 14 | Retainer Ring, Thrust Plate | NSS | 910953 |
| 15 | Nut | 18-3730 | 912920, 3852648 |
| 16 | Washer | NSS | 911833 |
| 17 | Gasket, Outdrive Mounting | 18-2918 | 911836, 915840 |
| 18 | Gasket, Adapter to Gear Housing | 18-0911 | 911698 |
| 19 | O-Ring, Adapter, Large | 18-7407 | 911700 |
| 20 | O-Ring, Adapter, Small | 18-7403 | 909316 |
| 21 | Water Pump Shaft Seal | 18-2068 | 911701, 915702, 916058, 3853655 |
| 22 | Adapter, Water Pump to Gear Housing | 18-4836 | 911699 |
| 23 | Screw | 18-1598 | 908668, 341013 |
| Water Pump Kit (Incl. items 24-29) | 18-3348 | 984461, 984744 | |
| 24 | Gasket, Plate to Adapter | 18-2916 | 911702 |
| 25 | Plate, Water Pump | 18-3121 | 911703 |
| 26 | Impeller | 18-3058 | 983895, 777128 |
| 27 | Liner, Water Pump Cover | 18-3145 | 911844 |
| 28 | Seal, Water Pump Housing | 18-2541 | 911704 |
| 29 | Impeller Housing | 18-3206 | 984744 |
| 30 | Screw | NSS | 912238 |
| 31 | Shim, Bearing Carrier 0.010" | 18-0207 | 911668 |
| 31 | Shim, Bearing Carrier 0.001" | 18-0209 | 911669, 911670, 611671, 911672, 911673, 911674, 911675, 911676, 911677 |
| 31 | Shim, Bearing Carrier 0.003" | 18-0211 | 911669, 911670, 611671, 911672, 911673, 911674, 911675, 911676, 911678 |
| 32 | Pinion Nut | 18-3769 | 911753 |
| 33 | Nut Retainer | 18-3610 | 911752 |
| 34 | Pinion Washer | NSS | 911697 |
| 35 | Pinion Bearing, Lower | 18-1170 | 983892 |
| 36 | Bearing Carrier, Pinion | 18-4828 | 911750 |
| 37 | Pinion Bearing, Upper | 18-1161 | 983891 |
| 38, 45 | Gear Set, 21:16 | 18-1600 | 983825 |
| 38, 45 | Gear Set, 21:18 | 18-1601 | 983826 |
| 38, 45 | Gear Set, 21:19 | 18-1602 | 984012 |
| 39 | Retainer Ring, Pinion Housing | 18-3768 | 911751 |
| 40 | O-Ring, Gear Housing Cover | 18-7107 | 313175 |
| 41 | Shim, Gear Position, 0.003" | 18-02062 | 911662 |
| 41 | Shim, Gear Position, 0.005" | 18-02063 | 911663 |
| 41 | Shim, Gear Position, 0.007" | - | 911664 |
| 41 | Shim, Gear Position, 0.010" | 18-02065 | 911665 |
| 41 | Shim, Gear Position, 0.012" | 18-02066 | 911666 |
| 41 | Shim, Gear Position, 0.015" | 18-02067 | 911667 |
| 42 | Bearing, U-Joint Shaft | 18-1171 | 983878 |
| 43 | Nut, Gear to U-Joint | 18-3770 | 911937 |
| 44 | Centering Cone | 18-4835 | 912029 |
| 46 | Bearing, Bearing Carrier | 18-1172 | 983877 |
| 47 | O-Ring, Bearing Carrier | 18-7169 | 911686 |
| 48 | Shim, Bearing Carrier, 0.005", Blue | 18-02060 | 911680 |
| 48 | Shim, Bearing Carrier, 0.010", Brown | 18-02061 | 911681 |
| 49 | Gear Bearing Carrier | 18-4838 | 911683 |
| 50 | Seal, Bearing Carrier | 18-2067 | 911685 |
| 51 | U-Joint & Water Pump Shaft Assy. | 18-2338 | 983880 |
| 52 | Stub & Water Pump Shaft | 18-6399 | 984264 |
| 53 | U-Joint Assy. | 18-2104 | 912214 |
| 54 | Yoke Shaft | 18-2146 | 912212 |
| 55 | O-Ring, U-Joint Shaft | 18-7153 | 911851, 3852565 |
| 56 | Gear Housing Cover | 18-4838 | 911845, 986363 |
| 57 | Oil Indicator | 18-8369 | 914488 |
| 58 | O-Ring, Oil Indicator | 18-7116 | 303067 |
| 59 | Screw, Gear Housing Cover | 18-1599 | 123018 |
| 60 | Cover, Water Pump Access | 18-4750 | 983967 |
| 61 | Screw, Water Pump Access Cover | 18-4749-9 | 911859, 3852568 |
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