SELVA MARINE Blue Whale 250 EFI, Service Manual

Page: 252 / 377

LOWR
Lower unit
6-61
6P23H11
5. Slowly turn the drive shaft clockwise and
counterclockwise and measure the back-
lash when the drive shaft stops in each
direction.
6. Add or remove shim(s) if out of specifica-
tion.
M: Measurement
7. Remove the special service tools from
the propeller shaft.
8. Turn the shift rod in direction
c
to the
reverse position using the shift rod push
arm.
9. Turn the drive shaft clockwise until the
dog clutch
7
is fully engaged.
10. Turn the shift rod in direction
d
to the
neutral position using the shift rod push
arm.
11. Turn the drive shaft counterclockwise
approximately 30°.
12. Turn the shift rod in direction
c
to the
reverse position using the shift rod push
arm.
13. Slowly turn the drive shaft clockwise and
counterclockwise and measure the back-
lash when the drive shaft stops in each
direction.
NOTE:
When measuring the reverse gear backlash,
add force to the reverse direction
c
using
the shift rod push arm.
14. Add or remove shim(s) if out of specifica-
tion.
Forward gear backlash:
0.46–0.82 mm (0.0181–0.0323 in)
Forward gear
backlash
Shim thickness
Less than
0.46 mm (0.0181 in)
To be decreased by
(0.64 – M)
×
0.71
More than
0.82 mm (0.0323 in)
To be increased by
(M – 0.64)
×
0.71
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and
0.50 mm
Reverse gear backlash:
0.45–0.78 mm (0.0177–0.0307 in)