Evinrude/Johnson outboard lower unit identification
Outboard lower unit gearcase identification drawings
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Smaller old style 3-1/2 inch hub years 1975-1988
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New style years 1989-2005
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Large gearcase years 1975-2006
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V4 90 degree years 1978-1998
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V4 60 degree years 1995-2006
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4-5/8 hub type O V4 and V6 years 1979-2006
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5-1/16 hub type M V4 and V6 years 2002-2006
Small gearcase old style years 1975-1988
15-1/2 inch tall.
Cavitation plate to propeller shaft 6-7/8 inch.
Hub area is 3-1/2 inch.
Straight at the trailing end of the gear housing and the fin.
Pointed at the trailing end of the cavitation plate.
Four hole internal water intake screen.
No speedo pitot.
Small gearcase New style years 1989-2005
15-3/4 inch tall.
Cavitation plate to propeller shaft 6-7/8 inch.
Straight at the trailing end of the gear housing and the fin.
Pointed at the trailing end of the cavitation plate.
Six holes above the cavitation plate.
External water intake screen.
Hub area is 3-7/8 inch.
Includes speedo pitot.
Large gearcase assembly years 1975-2006
Physical Characteristics are: 17-7/16 inch tall.
Cavitation plate to propeller shaft 7-1/8 inch.
Hub area is 4-1/16 inch.
Straight at the trailing end of the gear housing and the fin.
Pointed at the trailing end of the cavitation plate.
Six holes above the cavitation plate.
Internal water intake screen has three holes.
No speedo pitot.
V4 90 degree small gearcase assembly years 1978-1998
Physical Characteristics are: 19-3/16 inch tall.
Cavitation plate to propeller shaft 7-1/4 inch.
Hub area is 4-1/8 inch.
Straight at the trailing end of the gear housing and the fin.
Pointed at the trailing end of the cavitation plate.
Six holes above the cavitation plate.
Internal water intake screen has four holes.
No pitot.
Small Gear case Type V4 60 degree years 1995 to 2006
Physical Characteristics are:
19-1/16 inch tall.
Curved at the trailing end of the gear housing and fin.
Flat at the trailing end of the cavitation plate.
cavitation plate to propeller center 8 inch.
2 slots above the cavitation plate.
External water intake screens.
Large gearcase type O V4 / V6 years 1979 to 2006
19-3/16 inch tall.
Cavitation plate to propeller shaft 8-1/4 inch.
Hub area 4-5/8 inch.
Straight at the trailing end of the gear housing and the fin.
Pointed at the trailing end of the cavitation plate.
Two slots above the cavitation plate.
External water intake screens.
Large gearcase type M V4 / V6 years 2002-2006
19-3/16 inch tall.
Cavitation plate to propeller shaft 8-1/4 inch.
Hub area 5-1/16 inch.
Curved at the trailing end of the gear housing and the fin.
Flat at the trailing end of the cavitation plate.
Three slots above the cavitation plate.
External water intake screens.
Includes speedo pitot.
