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Lower Unit [Lower Unit] [2004]

Applicable Models

Model GroupYearModelSerial
Yamaha Outboard200490hpAll
Yamaha Outboard200475hpAll
Yamaha International200475hpAll
Yamaha International200490hpAll
Lower Unit [Lower Unit] [2004]
Yamaha Marine

LOWER UNIT

EXPLODED DIAGRAM

REMOVAL AND INSTALLATION CHART

Step Procedure/Part name Q'ty Service points
LOWER UNIT REMOVAL Follow the left "Step" for removal.
1 Cotter pin 1
2 Propeller nut 1
3 Spacer 1
4 Washer 1
5 Propeller 1
6 Thrust washer 1
7 Cap 1
8 Bolt 1
9 Trim tab 1
Mark the original position (a) for proper installation

EXPLODED DIAGRAM

Step Procedure/Part name Q'ty Service points
10 Bolt 1
11 Bolt 4
12 Speedometer hose 1
13 Lower case 1
14 Pin 2
Reverse the removal steps for installation.

Service Points

WARNING
Do not hold the propeller with your hands when removing or installing it. Put a block of wood between the anti-cavitation plate and propel

Propeller removal

  1. Remove:
  • (1)Cotter pin
  • (2) Propeller nut
  • (3) Spacer
  • (4) Washer
  • (5) Propeller
  • (6) Thrust washer

Propeller inspection

  1. Inspect:
  • (1)Blades
  • (2)Splines
    Cracks/damage/wear -» Replace the propeller.

Propeller installation

  1. Install:
  • (1)Thrust washer
  • (2)Propeller
  • (3)Washer
  • (4)Spacer
  • (5)Propeller nut
  • (6)Cotter pin

NOTE:
If the groove in the propeller nut is not aligned with the cotter pin hole, tighten the nut further until they are
aligned.