Measuring The Forward Gear Backlash; Adjusting The Forward Gear Shim Thickness (T2) - Yamaha F150B Service Manual

Measuring the forward gear backlash

• Spray anti-rust lubricant on the gear 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 original shim(s) (T2) a.
TIP:
• If the original shim(s) (T2) are missing,
install new shim(s) (T2) with a combined
thickness of 0.52 mm.
• Do not reuse a shim if it is any deformed or
scratched.
2. Install the propeller
assembly b, and key c.
TIP:
When assembling the lower unit to measure
the backlash, do not install the dog clutch and
O-ring.
a
shaft housing
b
c
Shimming (counter rotation model)
3. Install the claw washer. Check that the
position a is set in place properly.
a
4. Install the ring nut, and then tighten the
ring nut to the specified torque.
d
e
Ring nut wrench extension d:
90890-06513
Ring nut wrench 4 e: 90890-06512
Ring nut:
143 N·m (14.3 kgf·m, 105.5 ft·lb)
5. Check that the drive shaft rotates
smoothly. If the drive shaft does not
rotate smoothly, the shim(s) may be
installed incorrectly or there may be
foreign material on the shim(s).
6. Measure the forward gear backlash. See
"Measuring the forward and reverse gear
backlash before disassembly" (8-68).
Forward gear backlash:
0.15–0.49 mm (0.0059–0.0193 in)
Adjusting the forward gear shim
thickness (T2)
1. Remove the propeller shaft housing
assembly and shim(s) (T2). See "Remov-
ing the propeller shaft housing assembly"
(8-55).
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A
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