LOWR
Shimming (counter rotation model)
Shimming workflow
Remove the water pump
assembly and cover.
Measure the backlash before
disassembly.
Within specification?
Disassemble the lower unit.
Select the pinion shims (T3)
and propeller shaft shims (T4).
Assemble the lower unit.
Measure the backlash.
Within specification?
Install the water pump
assembly.
TIP:
• If the backlash is within specification, shimming is not required.
• When assembling the original inner parts and a new lower case, shimming is required.
• When replacing the pinion, forward gear, reverse gear, bearings, drive shaft, or propeller shaft
housing, shimming is required.
8-81
Lower unit
NO
YES
YES
Shimming is not required.
Adjust the forward gear shim
NO
thickness (T2) and reverse gear
shim thickness (T1).