SELVA MARINE Blue Whale 250 EFI, Service Manual

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LOWR
Lower unit
6-29
6P23H11
4. Install the backlash indicator onto the
drive shaft (22.4 mm [0.88 in] in diame-
ter), then the dial gauge.
NOTE:
Install the dial gauge so that the plunger
a
contacts the mark
b
on the backlash indica-
tor rod.
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. Apply a load to the reverse gear by
installing the propeller
7
, the spacer
8
(without the washer
9
), then the washer
0
as shown.
NOTE:
Tighten the propeller nut
A
while turning the
drive shaft until the drive shaft can no longer
be turned.
9. Slowly turn the drive shaft clockwise and
counterclockwise and measure the back-
lash when the drive shaft stops in each
direction.
Backlash indicator
4
: 90890-06706
Magnet base plate
5
: 90890-07003
Dial gauge set
6
: 90890-01252
Magnet base B
7
: 90890-06844
Forward gear backlash:
0.32–0.55 mm (0.0126–0.0216 in)
Forward gear
backlash
Shim thickness
Less than
0.32 mm (0.0126 in)
To be decreased by
(0.44 – M)
×
0.71
More than
0.55 mm (0.0216 in)
To be increased by
(M – 0.44)
×
0.71
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and
0.50 mm
Reverse gear backlash:
0.32–0.65 mm (0.0126–0.0256 in)