Mercury 25 EFI Service Manual page 407

Table of Contents
Gearcase Specifications.................................................... 6A-2
Gear Housing (Driveshaft)................................................. 6A-6
Gear Housing (Propeller Shaft)..........................................6A-8
General Service Recommendations................................ 6A-10
Bearings....................................................................6A-10
Shims........................................................................6A-10
Seals.........................................................................6A-10
Draining and Inspecting Gear Housing Lubricant............ 6A-10
Gear Housing Removal....................................................6A-11
Gear Housing Disassembly............................................. 6A-13
Bearing Carrier Disassembly.................................... 6A-13
Propeller Shaft Disassembly.....................................6A-17
Water Pump, Driveshaft and Shift Shaft Disassembly
.............................................................................. 6A-18
Driveshaft Removal.................................................. 6A-24
Forward Gear and Reverse Gear Inspection............6A-24
Driveshaft Pinion Bearing Inspection........................6A-26
Upper Driveshaft Bearing Inspection........................ 6A-26
90-8M0105568 eng MARCH 2016
Lower Unit
Section 6A - Gear Housing
Gear Housing Reassembly.............................................. 6A-28
© 2016 Mercury Marine
Driveshaft Inspection................................................ 6A-27
Pinion Bearing Installation........................................ 6A-28
Forward Gear Bearing Installation............................ 6A-28
Bearing Carrier Reassembly.....................................6A-29
Water Pump Base Reassembly................................6A-31
Propeller Shaft Reassembly..................................... 6A-31
Checking and Adjusting Pinion Gear Location......... 6A-32
Checking and Adjusting Forward Gear Backlash..... 6A-35
Shift Shaft Installation............................................... 6A-37
Water Pump Cover Reassembly.............................. 6A-38
Propeller Shaft and Bearing Carrier Installation....... 6A-40
Anode Inspection and Installation.............................6A-41
Gear Housing Installation......................................... 6A-42
Gearcase Lubricant Capacity................................... 6A-44
Gearcase Lubricant Recommendation..................... 6A-44
Checking Lubricant Level and Refilling Gearcase.... 6A-44
Propeller Installation................................................. 6A-45
Gear Housing
6
A
Page 6A-1