Measuring The Reverse Gear Backlash; Adjusting The Reverse Gear Shim (T1) Thickness - Yamaha F225F Service Manual

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Measuring the reverse gear backlash

• Spray anti-rust lubricant on the gears and
bearings before installation. Do not apply
gear oil to the parts. Otherwise, correct
measurements cannot be obtained.
• Keep the parts free of foreign material,
such as dirt and lint.
• When measuring the forward gear or
reverse gear backlash, use the original
bearings and shims.
1. Install the adapter assembly, original
reverse gear shim, thrust bearing, and
reverse gear assembly. See "Install the
reverse gear" (8-79).
TIP:
• If the original shim is missing, install a new
shim with a thickness of 2.00 mm.
• Do not reuse a shim if deformed or
scratched.
2. Install the drive shaft, pinion, and drive
shaft ring nut. See steps 1–3 in "Installing
the drive shaft" (8-28).
3. Check that the drive shaft turns smoothly.
4. Install the propeller
assembly. See step 2 in "Installing the
propeller shaft housing assembly" (8-79)
and steps 4–6 in "Installing the propeller
shaft housing assembly" (8-29).
5. Check that the drive shaft turns smoothly.
6. Measure the reverse gear backlash. See
steps 11–17 in "Measuring the forward
gear backlash and reverse gear backlash
before disassembly" (8-84).
Reverse gear backlash:
0.19–0.84 mm (0.0075–0.0331 in)
TIP:
In the "Reverse gear shim (T1) selection
table," use the round-down average for the
backlash measurement (BL1).
8-95
Lower unit
shaft housing
Adjusting the reverse gear shim (T1)
thickness
1. Remove the propeller shaft housing
assembly. See steps 1–5 in "Removing
the propeller shaft housing assembly" (8-
16) and step 2 in "Removing the propeller
shaft housing assembly" (8-73)
2. Remove the ring nut, pinion, and drive
shaft. See steps 2 and 3 in "Removing
the drive shaft" (8-23).
3. Remove the reverse gear, thrust bearing,
original reverse gear shim, and adapter.
See "Removing the reverse gear" (8-78).
4. Measure the thickness of the original
reverse gear shim in 2 places.
TIP:
Do not reuse a shim if deformed or
scratched.
5. Determine the reverse gear shim (T1)
thickness using the "Reverse gear shim
(T1) selection table" according to the
backlash measurement
"Measuring the reverse gear backlash"
and the current shim thickness. See
"Reverse gear shim (T1) selection table"
(8-97).
(BL1) from