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Sierra Marine Parts Catalog: Mercruiser

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18-2204
18-2203
UPPER UNIT GEAR SET
UPPER UNIT GEAR SET
Replaces: 43-75325A3
Replaces: 43-45814A5
(1.84:1 Ratio)
(Drive Gear = 17 teeth Driven Gear = 19 teeth)
(1.65:1 Ratio) (Drive Gear = 24 teeth
For: V-6 and 470/485 (4 Cyl. etc.) and Gen II
Driven Gear = 24 teeth)
(S/N K999999 & BELOW)
For: 6 Cyl. Inline S/N K999999 & BELOW
18-2205
18-6350
UPPER UNIT GEAR SET
UPPER UNIT GEAR SET
Replaces: 43-55778A3
Replaces: 43-853640A2
(1.98:1 Ratio)
For: Gen II Upper (1998-up), 0L100040-up,
(Drive Gear = 20 teeth Driven Gear = 24 teeth)
1.62/2.00:1 Ratios (24-24 Teeth)
For: 120/140 (S/N 2791957 & UP) and Gen II
Used with: 18-2417 Complete Upper Gear Case
(S/N K999999 & BELOW)
18-6352
UPPER UNIT GEAR SET
18-6353
18-6351
Replaces: 43-853642A2
UPPER GEAR KIT
UPPER UNIT GEAR SET
For: Alpha I (Gen II ) (1998-up), 0L100040-up,
Replaces: 43-853643A2
Replaces: 43-853641A2
1.94:1, 2.40:1 Ratios (20-24 Teeth)
For: Alpha I (Gen II) (1998-up), 0L100040-up,
1.81 Ratio Upper Gear Set, 17-19 Teeth
For: Mercruiser Vazer
1.47:1 Ratio (20-22 Teeth)
For: Alpha I Gen II 1998-up/0L00040-up
Used with: 18-2411 Drive Shaft Housing Assembly,
Used with: 18-2416 Complete Upper Gear Case
For: Mercruiser Vazer
18-2419 Complete Upper Gear Case
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
FIG. #1
in the same application.
FIG. #3
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. #2
-- 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
18-2256
to Bell Housing Gasket
27-94996-2
1
UPPER GEAR KIT
18-1160
Bearing
31-35988A2
1
Replaces: 43-803116T1
18-1165
Bearing
31-61100A1
1
711
Most V-8 Drives (1.5:1 Ratio)
18-1142
Bearing
31-35990A1
1