Sierra Marine Parts Catalog

829 18-2205 UPPER UNIT GEAR SET Replaces: 43-55778A3, 43-55766A2, 43-55766A3 (1.98:1 Ratio) (Drive Gear = 20 teeth Driven Gear = 24 teeth) For: 120/140 (S/N 2791957 & UP) and Gen II (S/N K999999 & BELOW) 18-2204 UPPER UNIT GEAR SET Replaces: 43-75325A3, 43-75325A2 (1.84:1 Ratio) (Drive Gear = 17 teeth Driven Gear = 19 teeth) For: V-6 and 470/485 (4 Cyl. etc.) and Gen II (S/N K999999 & BELOW) 18-6350 UPPER UNIT GEAR SET Replaces: 43-853640A2, 43-821823A1 For: Gen II Upper (1998-up), 0L100040-up, 1.62/2.00:1 Ratios (24-24 Teeth) 18-2203 UPPER UNIT GEAR SET Replaces: 43-45814A5, 43-55765A2, 43-55765A3 (1.65:1 Ratio) (Drive Gear = 24 teeth Driven Gear = 24 teeth) For: 6 Cyl. Inline S/N K999999 & BELOW Stern Drive Model Beg. S/N End. S/N 225 3856268 4200499 260 4898730 6225576 898/228 4782330 6225576 Stern Drive Model Beg. S/N End. S/N 888 3106717 & UP V8R/MR/AlphaOne 6225577 & UP 18-2201 UPPER UNIT GEAR SET  Replaces: 43-18410A2, 43-18411A2, 43-59832A2, A4 Includes: (1) 18-1142 Mercruiser #31-32573A1 (1.5:1 Ratio) (Drive Gear = 22 teeth Driven Gear = 20 teeth) For most V-8 Drives and Gen II (S/N K999999 & BELOW) 18-6353 UPPER GEAR KIT Replaces: 43-853643A2 1.81 Ratio Upper Gear Set, 17-19 Teeth For: Alpha I Gen II 1998-up/0L00040-up For: Mercruiser Vazer 18-6351 UPPER UNIT GEAR SET Replaces: 43-853641A2 For: Alpha I (Gen II) (1998-up), 0L100040-up, 1.47:1 Ratio (20-22 Teeth) Used with: 18-2416 Complete Upper Gear Case 18-6352 UPPER UNIT GEAR SET Replaces: 43-853642A2 For: Alpha I (Gen II ) (1998-up), 0L100040-up, 1.94:1, 2.40:1 Ratios (20-24 Teeth) For: Mercruiser Vazer Used with: 18-2411 Drive Shaft Housing Assembly, 18-2419 Complete Upper Gear Case FIG. #1 FIG. #2 FIGURES #1 - #2 Provides two separate views of the upper gear housing driven gear being properly shimmed using the Sierra installation tools. FIGURES #3 - #4 Provides the same views of the drive gear being shimmed in the same application. NOTE: This installation cannot be performed correctly without the Sierra 18-9856 shim tool. Improper installation will result in gear failure. The .025 referenced in FIG #2 & FIG #4 is achieved when .026 will not fit the clearance but .025 will. A service manual should always be consulted for step-by-step instructions. FIG. #4 FIG. #3 18-2256 UPPER GEAR KIT Replaces: 43-803116T1 Most V-8 Drives (1.5:1 Ratio) — CONTAINS — Part # Description O.E. # Qty. 18-2201 Upper Unit Gear Set 43-18410A2 1 18-2648 Seal Kit 26-32511A2 1 18-2619-1 Outdrive Gasket Set 27-94996A1 1 18-2820 Drive Shaft Housing to Bell Housing Gasket 27-64818 1 18-2743 Drive Shaft Housing to Bell Housing Gasket 27-94996-2 1 18-1160 Bearing 31-35988A2 1 18-1165 Bearing 31-61100A1 1 18-1142 Bearing 31-35990A1 1 I/O — MERCRUISER - Drive System