Mercury Force 50 H.P. 1990, Gear Housing - parts catalog
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Gear Housing
(1990) - 507A90B, 507F90B, 507X90B, 507Y90B, 508F90B| Parts Diagram | ## | Part # | Description | Qty | Notes |
 | 1 | 26-819293 | Seal, driveshaft spline | 1 | replaces F338129-1 |
| 2 | F338271 | Retainer | 1 | ||
| 3 | 45-819826A1 | Driveshaft | 1 | replaces FA89128-1 | |
| 4 | 17-F901563 | Drive pin, water pump impeller | 1 | ||
| 6 | 53-F658208 | Retaining ring | 1 | discontinued | |
| 7 | 817976A4 | Inlet water line kit | 1 | discontinued | |
| 9 | FA94094-2 | Propeller nut | 1 | ||
| 10 | 18-89961 | Cotter pin, s.s., 1/8 - 1/2 | 1 | replaces F1027 | |
| 11 | 25-201951 | Seal | 3 | replaces F40342 | |
| 12 | FK247 | Propeller pin, pack of 6 | 1 | ||
| 13 | 10-F1263 | Hex socket head cap screw, s.s., 5/16 - 18 x 9/16 | 2 | ||
| 14 | 31-817731A5 | Propeller shaft bearing cage | 1 | ||
| 15 | 26-819396 | Seal, propeller shaft | 1 | replaces F141118 | |
| 16 | 30-820439A1 | Ball bearing, propeller shaft | 1 | replaces F366058 | |
| 17 | 25-88657 | Seal, propeller shaft bearing cage | 1 | replaces F141305 | |
| 18 | 43-819262T1 | Bevel gear rear w/bearing | 1 | replaces 43-819262A1 | |
| 19 | 12-F40717-1 | Thrust washer, bevel gear | 2 | replaces F40717 | |
| 20 | 30-F366727 | Ball, propeller shaft | 1 | limited availability | |
| 21 | 44-819500A3 | Propeller shaft assembly | 1 | ||
| 22 | F90871-3 | Gear shift arm pin | 1 | ||
| 23 | 17-F2097 | Spring pin | 1 | discontinued | |
| 24 | 52-819259T | Clutch | 1 | replaces F99521-1 | |
| 25 | 43-817824A2 | Bevel gear front w/bearing and cup | 1 | ||
| 26 | 1600-817826A7 | Gear housing lower w/thrust bearing cup | 1 | discontinued | |
| -- | 1600-819516A2 | Gear housing kit | 1 | discontinued | |
| 27 | 10-79953Q04 | Plug, gear housing | 2 | replaces F50109 | |
| 28 | 12-191833 | Washer, gear housing plug | 2 | replaces F8077 | |
| 29 | 826374 | Gear shift arm pivot pin | 1 | replaces F498891 | |
| 30 | 25-25007 | Seal, o-ring | 1 | replaces F498618 | |
| 31 | 16-F97008-1 | Stud, long | 1 | discontinued | |
| 32 | 12-34931 | Washer, plain | 1 | replaces F2014 | |
| 33 | 11-F1346 | Hex nut, s.s., 3/8 - 16 | 2 | ||
| 34 | 817796A2 | Gear shift arm assembly | 1 | ||
| 35 | 43-819261T1 | Bevel pinion w/bearing | 1 | replaces F2A474266 | |
| 36 | 819295 | Gear shift rod lower | 1 | discontinued, replaces F435705 | |
| 37 | 18-F1015 | Cotter pin | 1 | ||
| 38 | 17-F85372 | Pin, gear shift rod lower | 1 | ||
| 39 | 16-F695273-1 | Stud, short | 1 | discontinued, replaces F40008-1 | |
| 40 | 817795A1 | Exhaust, snout | 1 | discontinued w/literature original Force p/n A435116-1 | |
| 41 | 25-841807 | Seal, gear housing | 1 | replaces F435555 | |
| 42 | 1500-817871A3 | Gear housing upper | 1 | discontinued, replaces FA684554 | |
| 43 | 26-817472 | Seal, shift rod lower | 1 | replaces F338618-1 | |
| 44 | 35-819228 | Screen, water inlet | 1 | replaces F435077 | |
| 45 | 23-F435057 | Bearing, driveshaft upper | 1 | discontinued | |
| 46 | 26-F40307-2 | Seal, driveshaft upper | 1 | ||
| 47 | 1 | Water pump back plate | 1 | replaces F435562 | |
| 48 | 47-F433065-2 | Water pump impeller | 1 | ||
| 49 | 46-803824T | Water pump body | 1 | replaces FA463060 | |
| 50 | 26-F349307 | Driveshaft seal - water pump | 1 | ||
| 51 | FA485914 | Seal, inlet water line, lower | 1 | w/literature | |
| 52 | 10-F2030 | Hex head screw, s.s., 1/4 - 20 x 1-1/4 | 4 | ||
| 53 | FA435616 | Gear shift rod intermediate | 1 | discontinued | |
| 54 | 485388 | Disc, water pump | 1 | ||
| 55 | 10-F2008 | Hex head M.s., 1/4 - 20 x 7/8 | 2 | discontinued | |
| 56 | F90619-2 | Yoke | 1 | ||
| 57 | 26-820645A1 | Gear housing seal kit | 1 | replaces FK1074 | |
| 58 | FK1073 | Water pump kit | 1 | ||
| -- | 10-F2030 | Screw 1/4 - 20 x 1-1/4 | 4 | ||
| -- | 47-F433065-2 | Impeller | 1 | ||
| -- | 1 | Back plate, water pump | 1 | replaces F435562 | |
| -- | 17-F901563 | Drive pin | 1 | ||
| -- | 46-803824T | Water pump body | 1 | replaces FA463060 | |
| 59 | 13-58643 | Lock washer | 1 | replaces F8065 | |
| 60 | F691415 | Washer | 1 | discontinued | |
| 61 | 25-62704 | Seal | 1 | replaces F24342 | |
| 62 | 10-35047 | Screw, 3/8 - 16 x 1-1/8 | 4 | replaces F1929 |
Parts list covers the following S/N:
507A90B, 507F90B, 507X90B, 507Y90B, 508F90B
