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Shimming (regular rotation model)
Shimming (regular rotation model)
Shimming workflow
• Make sure to drain the gear oil before measuring the backlash.
• 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 hous-
ing, shimming is required.
1. Disassemble the lower unit.
2. Select the forward gear shim (T1) and reverse gear shims (T2).
3. Install the forward gear and pinion temporarily.
4. Select the pinion shims (T3).
7. Within specification?
11. Select the propeller shaft
shims (T4).
12. Assemble the lower unit.
5. Install the reverse gear and propeller shaft.
6. Measure the backlash.
9.
8. NO
10. YES
Repeat steps from the selection of the
forward gear shim (T1) and reverse gear
shims (T2).
1. Disassemble the lower unit.
2. Select the forward gear shim (T1) and
reverse gear shims (T2).
3. Install the forward gear and pinion tem-
porarily.
4. Select the pinion shims (T3).
5. Install the reverse gear and propeller
shaft.
6. Measure the backlash.
7. Within specification?
8. NO
9. Repeat steps from the selection of the
forward gear shim (T1) and reverse
gear shims (T2).
10. YES
11. Select the propeller shaft shims (T4).
12. Assemble the lower unit.
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