Mercury 50 Service Manual

SPECIFICATIONS
90-828631R3 MARCH 1999 Page 1A-7
1997 AND NEWER
GEAR HOUSING
(1.83:1)
40/45/50 1997 and Newer models
Gear Ratio
Gearcase Capacity
Lubricant Type
Forward Gear
Number of Teeth
Pinion Gear
Number of Teeth
Pinion Height
Forward Gear Backlash
Water Pressure
@ Idle
@ WOT
1.83:1
14.9 fl oz (440 mL)
Quicksilver Gear Lube-Premium Blend
22 Spiral/Bevel
12 Spiral/Bevel
0.025 in. (0.64 mm)
No Adjustment
2-4 psi (14-28 kPa) @ 750 rpm
12-17 psi (83-117 kPa) @ 6000 rpm
1998 AND NEWER
BIGFOOT GEAR
HOUSING
(2.3:1)
Gear Ratio
Gearcase Capacity
Lubricant Type
Forward Gear
Number of Teeth
Pinion Gear
Number of Teeth
Pinion Height
Forward Gear Backlash
Water Pressure
@ 750 rpm (Idle)
@ 6000 rpm (WOT)
2.3:1
22.5 fl oz (655 mL)
Quicksilver Gear Lube-Premium Blend
30 Spiral/Bevel
13 Spiral/Bevel
0.025 in. (0.64 mm)
0.012-0.019 in. (0.30-0.48 mm)
2-4 psi (14-28 kPa)
10-15 psi (69-103 kPa)
Gear Case Design Identification
a
b
“3 Jaw Reverse Clutch” “6 Jaw Reverse Clutch”
a-Design I - “3 Jaw Reverse Clutch” Gear Case Identifier
b-Design II - “6 Jaw Reverse Clutch” Gear Case Identifier
Identify gear case design to ensure correct components are being installed. Design I -
“3 Jaw Reverse Clutch” (a) gear case identified with straight machined edge for trim tab
screw mounting surface. Design II - “6 Jaw Reverse Clutch” (b) gear case identified with
angled machined edge for trim tab screw mounting surface.

Mercury 50 Specifications

General

Horsepower	50 hp
Cylinders	3
Steering	Remote
Starting	Electric
Displacement	995 cc
Fuel Induction System	EFI (Electronic Fuel Injection)
Alternator Output	18 amp
Shaft Length	20" / 508 mm
Dry Weight	112 kg
Engine Type	4-Stroke