Yamaha F150A, Service Manual, Page: 344 / 493

8-37
Shimming (regular rotation model)
14. Determine the backlash average, and
then round down the average to 2
decimal places.
Example:
15. Check that the forward gear backlash
average is within specification.
TIP:
Adjust the shim thicknesses if the forward
gear backlash is out of specification.
16. Remove the special service tools from
the propeller shaft.
17. Apply a load to the reverse gear by
installing the propeller “1”, spacer “2”
(without installing the spacer “3”), and
washer “4”.
18. Tighten the propeller nut “5” to the
specified torque.
A. Except SDS propeller
B. SDS propeller
19. Repeat steps 12–14 to measure the
reverse gear backlash.
20. Check that the reverse gear backlash
average is within specification.
TIP:
Adjust the shim thicknesses if the reverse
gear backlash is out of specification.
21. Remove the special service tools, and
then install the water pump assembly.
(mm)
Measurement point “a” 0.30
Measurement point “b” 0.36
Measurement point “d” 0.34
Measurement point “e” 0.33
Average 0.3325
Round-down average 0.33
Forward gear backlash (F150A):
0.15–0.61 mm (0.0059–0.0240 in)
Forward gear backlash (F150B):
0.15–0.68 mm (0.0059–0.0268 in)
Propeller nut “5” (shimming):
10 N·m (1.0 kgf·m, 7.4 ft·lb)
A
B
1
2
3
4 5
3
Reverse gear backlash (F150A):
0.33–0.67 mm (0.0130–0.0264 in)
Reverse gear backlash (F150B):
0.33–0.74 mm (0.0130–0.0291 in)