Mercury Force 50 H.P. 1990, Cylinder Block, Head and Exhaust Chest Cover - parts catalog
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Cylinder Block, Head and Exhaust Chest Cover
(1990) - 507A90A, 507F90A, 507X90A, 507Y90A, 508F90A| Parts Diagram | ## | Part # | Description | Qty | Notes |
 | 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 |
Parts list covers the following S/N:
507A90A, 507F90A, 507X90A, 507Y90A, 508F90A
