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Sierra

evinrude gearcase exploded view
Evinrude Gearcase Exploded View Diagram and Parts
Fits 50-75 HP 3-Cyl 1979-2003
Figure #DescriptionO.E.M. #Sierra #Qty.
*Gearcase Assembly, Complete   
*Housing, Gearcase392478 1
1Screw, Guide Tube908158 18-3153 21
2Guide, Water Tube319276 18-3112 21
3Seal, Guide tube314008 18-2703 21
4Housing, Water Pump435673 18-3129 21
5aLiner, Water Pump Housing321940 18-3128 21
5bLiner Top Plate324980 18-3126 21
6Impeller396725 18-3053 21
7Key, Impeller334897 18-3138 21
8Bolt, Water Pump Housing302325 18-3133 24
9Grommet342786 18-2705 21
10Seal, Water Pump Housing324981 18-7481 1 21
11Plate, Impeller341038 18-3127 21
12Gasket, Water Pump336530 18-2709 21
13Bolt, Driveshaft Retaining Housing909386 4
14Driveshaft Retaining Housing385087 1
15Seal342786 18-8325 11
16O-Ring Bearing Housing313754 18-7128 11
17aShim (.003)323889 18-2232AR
17bShim (.004)323890 18-2233AR
17cShim (.005)317232 18-2234AR
18Washer, Thrust317230 18-01941
19Bearing, Thrust385068 18-13671
*O-Ring, Driveshaft (not pictured)310585 18-7158 21
20Driveshaft (std)437376 1
21Slinger, Shift Arm321452 18-27061
22Shiftshaft327337 1
23Bolt, Shiftshaft Housing302325 18-31334
24Shiftshaft Housing388651 1
25O-ring, Shiftshaft318372 18-71371
26Gasket, Shiftshaft Housing314082 18-28551
27Nut, Pinion313339 1
28Gear, PinionNSSNSS 
29Bearing, Pinion382343 18-13561
30Screen, Water Inlet314175 1
31Seal, Exhaust324937 18-25371
32Anode, Cavitation436745 18-60241
33Trim Tab318544 1
34Bolt, Trim Tab313715 1
35Lockwasher306470 1
36Bolt, Short Gearcase306503 1
37Bolt, Anode328096018-48231
38Lockwasher306314 1
39Bolt, Long Gearcase313697 1
40O-Rings, Drain Plugs311598 18-7145 12
41Drain Fill Plug, Upper307551 18-23871
42Seal33258411
43Bolt, Pinion Retaining324852 1
44Bolt, Housing308843 4
45Magnetic Drain Screw318544 18-23781
46Pin, Bearing Housing331880 18-37651
47Pin, Shifter Housing320145 1
48Bearing Housing Assy.391365 1
49Bearing, HousingNSS NSS
50Detent, Shift326670 1
51Detent, Ball327345 1
52Detent, Spring911961 1
53Lever, Shift324037 1
54Cradle, Shifter334163 18-37661
55Shaft, Shifter326668 1
56Thrust Washer, Forward Gear324766 18-01981
57Thrust Bearing, Forward Gear385043 18-13711
58Gear Set, Forward & Pinion397338 18-22071
59Clutch, Sliding318303 18-22091
60Spring, Sliding Clutch324369 18-23991
61Pin, Sliding Clutch313448 18-17141
62Propshaft439185, 439131 18-22501
63Small Thrust Washer, Reverse Gear316484 1
64Gear, Reverse318304 18-22081
65Thrust Bearing, Reverse Gear382408 18-13661
66Large Thrust Washer, Reverse Gear313447 18-01931
67Retaining Plate, Carrier313453 1
68Retaining Rings313445 2
69O-Ring , Bearing Housing313446 18-7127 11
70Carrier Bearing (Fore)382407 18-13511
71Carrier Assembly434391 1
72Bolt, Carrier Anode127466 2
73Anode, Carrier306470 1
74Seal332584 18-7475 14
75Bolt, Carrier to Retainer320041 18-23794
76Carrier Bearing (Aft)379504 18-13501
77aOuter Seal, Carrier330137 18-8326 11
77bInner Seal, Carrier342787 18-2001 11
78Thrust Washer127084, 318841 18-42221
79Spacer, Prop Nut315810 18-42281
80Nut, Propeller314503 18-37051
81Cotter Pin, Prop Nut314502 18-37421
82Gear Housing Seal Kit396349 18-26601
83Water Pump Repair Kit, Complete432955 18-33891
1Contents of Gear Housing Seal Kit 18-2660
2Contents of Water Pump Kit 18-3389
ARAs required
This product typically leaves our warehouse in 1 to 3 business days.
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johnson gearcase exploded view-sierra 18-8325 oil seal

Sierra 18-8325 Oil Seal
Part # 18-8325
Our Price: $4.99
Compare at $5.49



Replaces OEM part #

  • OMC 342786

Low Price Guarantee
johnson gearcase exploded view-sierra 18-1714  clutch dog pin

Our Price: $2.99



Replaces OEM part #

  • OMC 313448
    For: 50-85, 100, 1354, 140, 150, 175, 200, 235, ( 1969-82 ) ( OMC Stringer Drive )

Low Price Guarantee
johnson gearcase exploded view-sierra 18-7128  o-ring

Sierra 18-7128 O-Ring
Part # 18-7128
Our Price: $1.99



Dimensions ( in )
I.D. 1.835
Width .100

Replaces OEM part #

  • OMC 313754

Low Price Guarantee
johnson gearcase exploded view-sierra 18-2208 reverse gear

Our Price: $167.99
Compare at $199.00



Replaces OEM part #

  • OMC 318304

Low Price Guarantee
evinrude grommets-sierra 18-2703 grommet

Sierra 18-2703 Grommet
Part # 18-2703
Our Price: $1.99



Replaces OEM part #

  • OMC 314008
Package of 2

Low Price Guarantee
johnson gearcase exploded view-sierra 18-3053 impeller

Sierra 18-3053 Impeller
Part # 18-3053
Our Price: $20.99
Compare at $23.99



Wedge Key

Applies for Johnson/Evinrude engines

Replaces OEM part #

  • OMC 396725

Low Price Guarantee
evinrude aft propshaft bearing

Our Price: $15.99
Compare at $18.49



Replaces OEM part #

  • OMC 382407
    Cobra

Low Price Guarantee
johnson gearcase exploded view-sierra 18-0193 thrust washer

Our Price: $8.99
Compare at $10.49



Replaces OEM part #

  • OMC 313447
For: Evinrude/Johnson 45-60hp-2 Cylinder, 3 Cylinder, V4, & V6
Reverse Gear

Low Price Guarantee
johnson gearcase exploded view-sierra 18-0198 thrust washer

Our Price: $31.99
Compare at $36.49



Replaces OEM part #

  • OMC 324766
For: Evinrude/Johnson 3 Cylinder, V4, & V6
Forward Gear

Low Price Guarantee
johnson gearcase o-rings

Sierra 18-7475 O-Ring
Part # 18-7475
Our Price: $5.99
Compare at $6.99



Dimensions ( in )
I.D. .250
Width .065
Package of 5

Replaces OEM part #

  • OMC 332583
  • OMC 332584

Low Price Guarantee
johnson lower unit drain / fill screw

Our Price: $2.99
Compare at $3.29



Replaces OEM part #

  • OMC 307551
    Fits: OMC V-6, V-4 ( 1979 & Up ), 60-75 hp 3 Cylinder, 20-35 hp ( 1985-97 )

Low Price Guarantee
johnson gearcase exploded view-sierra 18-2379 lower unit carrier screw

Our Price: $21.99
Compare at $25.49



Replaces OEM part #

  • OMC 320041
Package of 4

Low Price Guarantee
johnson gearcase exploded view-sierra 18-1371  thrust forward bearing

Our Price: $15.99
Compare at $18.49



Replaces OEM part #

  • OMC 385043
    Cobra

Low Price Guarantee
johnson gearcase exploded view-sierra 18-3705  prop nut - pkg of 5

Our Price: $28.99
Compare at $33.49



Replaces OEM part #

  • OMC 314503

Low Price Guarantee
evinrude grommets-sierra 18-2706 grommet

Sierra 18-2706 Grommet
Part # 18-2706
Our Price: $4.99



Replaces OEM part #

  • OMC 321008
Package of 2

Low Price Guarantee
johnson gearcase exploded view-sierra 18-7127 o ring

Sierra 18-7127 O Ring
Part # 18-7127
Our Price: $2.99



Dimensions ( in )
I.D. 3.315
Width .135

Replaces OEM part #

  • CHRYSLER FORCE 25-F84305
  • OMC 313446

Low Price Guarantee
evinrude housing pin

Sierra Housing pin
Part # 18-3765
Our Price: $2.99



Part # 18-3765
Replaces OEM part #

  • OMC 331880
For: 18-3767 Bearing Housing

Low Price Guarantee
johnson stainless steel bolts

Our Price: $0.99
Compare at $1.29



Replaces OEM part #

  • OMC 331979
For: Evinrude/Johnson rewind starters, water pump housings, mid-sections and jet drive units.
1/4" x 20 x 1-1/16" Hex

Low Price Guarantee
johnson gearcase exploded view-sierra 18-6024 anode

Sierra 18-6024 Anode
Part # 18-6024
Our Price: $10.99
Compare at $11.69



Replaces OEM part #

  • OMC 436745
  • OMC 393023
    ( 1982-87 ) For use on gearcases
For: Evinrude/Johnson 60-300 hp (1982-87). For use on gearcases.
Material: Zinc

Low Price Guarantee
johnson gearcase exploded view-sierra shift cradle

Sierra shift cradle
Part # 18-3766
Our Price: $11.99
Compare at $13.49



Part # 18-3766
Replaces OEM part #

  • OMC 334163
For: Evinrude/Johnson V-4/V-6 and OMC Cobra/Stringer

Low Price Guarantee
johnson gearcase exploded view-sierra 18-3129 water pump housing

Our Price: $12.99
Compare at $14.69



Replaces OEM part #

  • OMC 435673

Low Price Guarantee
evinrude oil seals

Sierra 18-2705 Seal
Part # 18-2705
Our Price: $2.99



Replaces OEM part #

  • OMC 315748
Package of 2

Low Price Guarantee
johnson gearcase exploded view-sierra prop spacer, om#315810

Our Price: $2.99



Part # 18-4228
Replaces OEM part #

  • OMC 315810

Low Price Guarantee
johnson gearcase exploded view-sierra 18-2660 gear housing seal kit

Our Price: $44.99
Compare at $51.99



Replaces OEM part #

  • OMC 396349
Kit Contains:
    (1) 18-2059 Oil Seal - replaces O.E. # 321466
    (1) 18-2064 Oil Seal - replaces O.E. # 332205
    (1) 18-2537 Rubber Seal - replaces O.E. # 324937
    (1) 18-2855 Shift Housing Cover to Gearcase Gasket - replaces O.E. # 314082
    (2) 18-4248 Washer - replaces O.E. # 311598
    (1) 18-7120 O-Ring - replaces O.E. # 307853
    (1) 18-7127 O-Ring - replaces O.E. # 313446
    (1) 18-7128 O-Ring - replaces O.E. # 313754
    (1) 18-7137 O-Ring - replaces O.E. # 318372
    (2) 18-7145 O-Ring - replaces O.E. # 333572
    (4) 18-7475 Quad Ring - replaces O.E. # 332584
    (1) 18-7174 O-Ring - replaces O.E. # 326649
    (2) 18-2001 Oil Seal - replaces O.E. # 330137

Low Price Guarantee
johnson gearcase exploded view-sierra 18-2250 propeller shaft

Our Price: $304.99
Compare at $359.00



Replaces OEM part #

  • OMC 387879

Low Price Guarantee
johnson gearcase exploded view-sierra thrust washer, om#318841

Our Price: $28.99
Compare at $32.99



Part # 18-4222
Replaces OEM part #

  • OMC 318841
  • OMC 127084

Low Price Guarantee
johnson gearcase exploded view-sierra 18-3742  cotter pins

Our Price: $4.99
Compare at $6.99



Replaces OEM part #

  • OMC 314502
1/8" x 1-1/4"
Package of 10

Low Price Guarantee
johnson gearcase exploded view-sierra 18-7481 rubber seal

Our Price: $9.99
Compare at $11.49



Replaces OEM part #

  • OMC 324981
Package of 2

Low Price Guarantee
evinrude reverse gear thrust bearings

Our Price: $5.99
Compare at $6.49



Replaces OEM part #

  • OMC 382408
    Cobra Reverse Gear

Low Price Guarantee
johnson gearcase exploded view-sierra 18-3127 impeller plate

Our Price: $4.99
Compare at $5.69



Replaces OEM part #

  • OMC 319275

Low Price Guarantee
johnson gearcase exploded view-sierra 18-2234 shim

Sierra 18-2234 Shim
Part # 18-2234
Our Price: $2.99



Replaces OEM part #

  • OMC 317232

Low Price Guarantee
johnson gearcase exploded view-sierra 18-3138 impeller key

Our Price: $1.99
Compare at $2.49



Replaces OEM part #

  • OMC 334897

Low Price Guarantee
evinrude gearcase exploded view-sierra 18-2399 clutch dog spring

Our Price: $1.99
Compare at $2.29



Replaces OEM part #

  • OMC 324369
For: Evinrude/Johnson/OMC V-4 & V-6

Low Price Guarantee
johnson gearcase exploded view-sierra 18-2709 wear plate

Sierra 18-2709 Wear Plate
Part # 18-2709
Our Price: $1.99



Replaces OEM part #

  • OMC 336530
Package of 2

Low Price Guarantee
johnson gearcase exploded view-sierra 18-3126 wear plate

Sierra 18-3126 Wear Plate
Part # 18-3126
Our Price: $5.99
Compare at $6.69



Replaces OEM part #

  • OMC 321940

Low Price Guarantee
johnson gearcase exploded view-sierra 18-3389 water pump repair kit w/housing

Our Price: $55.99
Compare at $65.49



Replaces OEM part #

  • OMC 436957
Contains:
  • (1) 18-7481 O-Ring - replaces O.E.#324981
  • (1) 18-2703 Grommet - replaces O.E.#314008
  • (1) 18-3053 Impeller - replaces O.E.#396725
  • (1) 18-3127 Impeller Plate - replaces O.E.#319275
  • (1) 18-2705 Seal - replaces O.E.#315748
  • (1) 18-3133 Stainless Steel Bolt - replaces O.E.#908158
  • (1) 18-3299 Flywheel Key - replaces O.E.#331107
  • (1) 18-7174 O-Ring - replaces O.E.#326649
  • (1) 18-2709 Wear Plate Gasket - replaces O.E.#336530
  • (1) 18-3129 Housing - replaces O.E.#435673
  • (1) 18-3138 Impeller Key - replaces O.E.#334897
  • (1) 18-3126 Wear Plate - replaces O.E.#321940
Applies for Johnson/Evinrude engines

Low Price Guarantee
johnson gearcase exploded view-sierra sliding clutch

Sierra Sliding Clutch
Part # 18-2209
Our Price: $69.99
Compare at $81.49



Part # 18-2209
Replaces OEM part #

  • OMC 318303

Low Price Guarantee
evinrude gearcase exploded view-sierra 18-7145 o-ring

Sierra 18-7145 O-Ring
Part # 18-7145
Our Price: $2.99
Compare at $3.29



Dimensions ( in )
I.D. .250
Width .100

Replaces OEM part #

  • OMC 333572
  • MERCURY MARINE 25-64068
Low Price Guarantee
johnson gearcase exploded view-sierra 18-3153 stainless steel bolts

Our Price: $1.99
Compare at $2.29



Replaces OEM part #

  • OMC 908158
For: Evinrude/Johnson lower unit anodes, bearing carriers, 45hp and up and Cobra, 5hp lower engine covers.
1/4" x 20 x 1/2" Hex

Low Price Guarantee
evinrude pinion gear bearings

Our Price: $12.99
Compare at $14.99



Replaces OEM part #

  • OMC 382343
  • MERCURY MARINE 31-54928
For: Mercruiser 215 E/H (1970-72): II,TR (1973-76): 225 TRS, 280 TRS (1973-76): TR, TRS (1977-93).

Low Price Guarantee
johnson gearcase exploded view-sierra 18-2537 rubber seal

Our Price: $4.99
Compare at $5.49



Replaces OEM part #

  • OMC 324937

Low Price Guarantee
johnson gearcase exploded view-sierra 18-2001  oil seal

Sierra 18-2001 Oil Seal
Part # 18-2001
Our Price: $6.99
Compare at $7.49



Shaft Size: 1.125
O.D.: 1.624
Width: 0.250


Replaces OEM part #

  • OMC 330137

Low Price Guarantee
johnson gearcase exploded view-sierra 18-1350

Sierra 18-1350
Part # 18-1350
Our Price: $10.99
Compare at $12.69



Replaces OEM part #

  • OMC 379504
  • OMC 379504

Low Price Guarantee
johnson gearcase exploded view-sierra 18-2207 forward gear set

Our Price: $228.99
Compare at $269.00



Replaces OEM part #

  • OMC 397338
Includes: Forward & Pinion Gears

Low Price Guarantee
johnson gearcase exploded view-sierra 18-2855 shift housing cover to gearcase

Our Price: $1.99



Replaces OEM part #

  • OMC 314082
Package of 2

Low Price Guarantee
johnson .004 shims

Sierra 18-2233 Shim
Part # 18-2233
Our Price: $3.99



Replaces OEM part #

  • OMC 323890

Low Price Guarantee
johnson gearcase exploded view-sierra 18-8326 oil seal

Sierra 18-8326 Oil Seal
Part # 18-8326
Our Price: