Mercury 20 EFI FourStroke Service Manual

Driveshaft Holding Tool 91‑804762
2. Remove the driveshaft from the gearcase. Retain the shims located above the upper driveshaft bearing.
a - Driveshaft
b - Shims (retained)
c - Upper driveshaft bearing
3. Inspect the pinion gear teeth for breakage, rust, chipping, or excessive wear.
a - Pinion gear teeth
4. If the pinion gear teeth are damaged, inspect the forward and reverse gears for damage.
Forward Gear and Reverse Gear Inspection
1.
Inspect the forward gear and the reverse gear teeth for breakage, rust, chipping, and excessive wear.
a - Forward gear
NOTE: Do not remove the forward gear and bearing assembly from the gearcase unless replacement is necessary. The
removal process will damage the bearing and forward gear bushing.
2. Inspect the forward gear ball bearing for roughness or excessive wear.
3. If the bearing is in serviceable condition, do not remove the bearing from the gearcase. The removal process may damage
the bearing and forward gear bushing.
65058
a
b
c
a
6616
a
6697
Gear Housing (2.15:1)
Page 6A-22 © 2018 Mercury Marine 90-8M0125265 eng NOVEMBER 2017

Mercury 20 EFI FourStroke Specifications

General

Power	20 HP
Fuel System	Electronic Fuel Injection (EFI)
Shaft Length	15", 20"
Starting	Electric
Starting System	Electric
Steering	Remote
Weight	112 lbs (51 kg)