298
GEARCASE
GEARCASE TYPES
GEARCASE TYPES
*Refer to Housing Profiles on p. 299
Housing Identification
Remove the trim tab retaining screw, gasket and
trim tab from the gearcase.
Make note of identification markings. Refer to
Housing Profiles on p. 299.
Outboard Model
Housing
Type*
Description of Features Gear Ratio
I-3 20 in. “S” standard gearset (I-3) 13:26 (.500)
V4 20 in. “S2” unique driveshaft with bolted pinion, oversized gearset 13:26 (.500)
I-3 / V4 25 in.
“O”
special gear ratio, uses V6 style prop 12:27 (.444)
V4 25 in.
Counter Rotation
special gear ratio, uses V6 style prop 12:27 (.444)
60°V6 20 in. standard gearset (V6) 14:26 (.538)
60°V6 & 90°V6 20 in.
60°V6 & 90°V6 25 in.
“L”
high speed profile, internal water screen, standard
gearset (V6)
14:26 (.538)
60°V6 & 90°V6 20 in.
60°V6 & 90°V6 25 in.
“L2”
high speed profile, external water screens, pressed in
propeller bearing housing, performance gearset (V6).
.583 ratio is original equipment on 225HO/250/300 HP.
14:26 (.538)
and
14:24 (.583)
90°V6 20 in.
60°V6 & 90°V6 25 in.
90°V6 30 in.
“M”
heavy duty gearset (V6) 13:24 (.542)
60°V6 25 in.
90°V6 25 in. / 30 in.
Counter Rotation
“CR” shafts, bearings and heavy duty gearset (V6) 13:24 (.542)
90°V6 20 in.
60°V6 & 90°V6 25 in.
90°V6 30 in.
“M2”
front water inlets and straight leading edge, pressed in
propeller shaft bearing housing with retaining flange,
heavy duty standard gearset (V6)
13:24 (.542)
60°V6 25 in.
90°V6 25 in. / 30 in.
Counter Rotation
front water inlets and straight leading edge, pressed in
propeller shaft bearing housing with retaining flange“
CR” shafts, bearings and heavy duty gearset (V6)
13:24 (.542)
1. Trim tab COA3663
1
1. Identification markings COA3139
1
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