Parts Diagram | ## | Part # | Description | Qty | Notes |
![Mercury Force 50 H.P. 1987 Gear Housing parts diagram](/parts/outboard.motors/mercury/images/sm.mercury-force-50-h-p-1987-parts.gear-housing-10.jpg) | 1 | 26-819293 | Seal, driveshaft spline | 1 | replaces F338129-1 |
2 | F338271 | Retainer | 1 | |
3 | 45-819826A1 | Driveshaft | 1 | w/illustration 2, replaces FA89128-1 |
4 | 17-F901563 | Drive pin, water pump impeller | 1 | |
5 | 25-201951 | Seal | 1 | replaces F40342 |
6 | 12-F8042 | Plain washer | 1 | discontinued |
7 | 32-F435244 | Inlet water line | 1 | |
8 | 48-819335A40 | Propeller 10-3/8 x 12-1/2 | 1 | model 507F7A, C507F7A, 507X7A, and 508M7A, replaces FP293 |
| 48-819336A40 | Propeller 10-3/8 x 11-1/2 model 507Y7A | 1 | replaces FP287 |
9 | FA94094-2 | Propeller nut | 1 | w/illustration 10 and 11 |
10 | 18-89961 | Cotter pin, s.s., 1/8 - 1/2 | 1 | replaces F1027 |
11 | 25-201951 | Seal, propeller nut | 1 | replaces F40342 |
12 | FK247 | Propeller pin, pack of 6 | 1 | w/illustration 10 |
13 | 10-F1263 | Hex socket hd cap screw, s.s., 5/16 - 18 x 9/16 | 2 | |
14 | 31-817731A5 | Propeller shaft bearing cage | 1 | includes items 15, 16 and 17 original Force p/n 2A 366298-1 |
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 FA485662 |
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 w/illustration 27, 28, 29 and 30, replaces FA486054 |
- | 1600-819516A2 | Gear housing kit | 1 | discontinued includes all items marked with an asterisk, replaces FC486054 |
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 | 13-58643 | Lock washer | 1 | replaces F8065 |
33 | 11-F1346 | Hex nut, s.s., 3/8 - 16 | 1 | |
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 |
40 | 817795A1 | Exhaust, snout | 1 | discontinued w/literature, replaces FA435116 |
41 | 25-841807 | Seal, gear housing | 1 | replaces F435555 |
42 | 1500-817871A3 | Gear housing upper | 1 | discontinued w/illustration 27, 28, 39, 40, 43, 44, 45, 46 and 55, replaces FA545554 |
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 | 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 | w/illustration 50, 51 and 54, replaces FA463060 |
50 | 26-F349307 | Driveshaft seal - water pump | 1 | |
51 | FA485914 | Seal, inlet water line, lower | 1 | w/literature |
52 | 10-F2030 | Hex hd 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 hd M.s., 1/4 - 20 x 1-1/4 | 2 | discontinued |
56 | F90619-2 | Yoke | 1 | |
57 | 26-820645A1 | Gear housing seal kit | 1 | includes all items marked with a double asterisk, replaces FK1074 |
58 | FK1073 | Water pump kit | 1 | includes items marked with an asterisk |
| 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 | w/illustration 50, 51, and 52, replaces FA463060 |
59 | 12-34931 | Plain washer | 1 | replaces F2014 |
60 | 11-68411 | Elastic stop nut 3/8 - 16 | 1 | limited availability, replaces F7004 |