Parts Diagram | ## | Part # | Description | Qty | Notes |
![Mercury Force 50 H.P. 1990 Cylinder Block, Head and Exhaust Chest Cover parts diagram](/parts/outboard.motors/mercury/images/sm.mercury-force-50-h-p-1990-parts.cylinder-block-head-and-exhaust-chest-cover-10.jpg) | 1 | 800-818152A19 | Cylinder w/crankcase cover and deflector plate | 1 | discontinued, replaces FA691010 |
-- | 800-818152A19 | Short block, contains cylinder, crankshaft, pistons & pins | 1 | discontinued, replaces FC691010 |
2 | 27-F691154 | Gasket, exhaust port plate | 2 | |
3 | 1 | Plate, exhaust port | 1 | replaces F691151 |
4 | 1000-8192691 | Cover, exhaust port | 1 | discontinued, replaces F691152 |
5 | 10-F1972 | Screw, exhaust port, 1/4 - 20 x 2-1/2 hex hd | 15 | discontinued |
6 | 10-49668 | Screw, 1/4 - 20 x 3/4 | 2 | replaces F1238 |
7 | F184122-1 | Seal, crankcase parting line | 1 | |
8 | 10-834892 | Screw, crankcase cover to cylinder | 2 | discontinued 3/8 - 16 x 3 at upper main, replaces F2228 |
9 | 10-812567 | Screw, crankcase cover to cylinder | 4 | 3/8 - 16 x 1-5/8 at center & lower main original Force p/n 2246 |
10 | 21-F463314 | Elbow, check valve | 1 | discontinued |
11 | 10-F1922 | Screw, crankcase to cylinder, 1/4 - 20 x 5/8 | 3 | discontinued |
12 | 10-28636 | Screw, crankcase to cylinder, 1/4 - 20 x 3/4 | 9 | replaces F1864 |
13 | 27-F691529-1 | Gasket, cylinder head | 1 | replaces F691529 |
14 | 900-F691518-1 | Head, cylinder | 1 | replaces F691518 |
15 | 1000-F691995 | Cover, cylinder head | 1 | discontinued |
16 | 12-34437 | Washer cylinder head bolts | 10 | replaces F1987 |
17 | 10-F2254 | Screw, cylinder head and cover to cylinder 5/16 - 18 x 2-1/2 | 10 | |
18 | 87-F658449-2 | Thermo switch w/wire | 1 | replaces F658449-1 |
19 | 53-F428096 | Retaining ring | 1 | |
20 | 10-98254 | Screw, cylinder head cover to cylinder head | 2 | replaces F1502 |
21 | 33-896329824 | Spark plug, UL-18V | 2 | replaces 33-8180071 |
22 | 12-F658504 | Washer, thermostat | 1 | |
23 | 895338 | Thermostat | 1 | replaces F97068-2 |
24 | 24-F658268 | Spring, thermostat | 1 | discontinued |
25 | 27-F97067 | Gasket, thermostat cover | 1 | limited availability |
26 | F658066 | Cover, thermostat | 1 | discontinued |
27 | 10-68918 | Screw, thermostat cover to cylinder head #10 - 24 x 1 | 3 | replaces F1995 |
28 | 32-F658418 | Tube, cooling system | 1 | discontinued |
29 | 22-47945 | Plug | 1 | replaces F19109 |
30 | 17-F8559 | Pin, dowel | 2 | |
31 | 13-53166 | Lock washer, spring | 1 | replaces F8096 |
32 | 10-90285 | Screw, hex cap, 5/16 - 18 x 5/8 | 1 | replaces F1857 |
33 | 1 | Gasket set | 1 | replaces FG1029 |
34 | 17-F40909 | Pin, locating | 1 | discontinued |
36 | 27-F691153 | Gasket, exhaust port cover | 1 | |
37 | 37-F685387-2 | Decal, US Marine | 1 | discontinued |
38 | 2 | Bumper | 2 | replaces F307942-1 |