Selecting The Forward Gear Shim - SELVA MARINE Blue Whale 250 EFI Service Manual

NOTE:
"P" is the deviation of the lower case dimen-
sion from standard. The "P" mark a is
stamped on the trim tab mounting surface of
the lower case in 0.01 mm units. If the "P"
mark is unreadable, assume that "P" is zero
and check the backlash when the unit is
assembled.
Calculation formula:
Pinion shim thickness (T3) =
82.00 + P/100 – M3 – M4
Example:
If "M3" is 50.75 mm and "M4" is 30.57 mm
and "P" is (+2), then
T3 = 82.00 + (+2)/100 – 50.75 – 30.57 mm
= 82.00 + 0.02 – 50.75 – 30.57 mm
= 0.70 mm
If "M3" is 50.70 mm and "M4" is 30.53 mm
and "P" is (–3), then
T3 = 82.00 + (–3)/100 – 50.70 – 30.53 mm
= 82.00 – 0.03 – 50.70 – 30.53 mm
= 0.74 mm
6. Select the pinion shim(s) (T3) as follows.
Calculated numeral
at 1/100 place
1, 2
3, 4, 5
6, 7, 8
9, 10
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and
0.50 mm
6P23H11
Rounded numeral
0
2
5
8
Shimming (regular rotation model)
Example:
If "T3" is 0.70 mm, then the pinion shim is
0.68 mm.
If "T3" is 0.74 mm, then the pinion shim is
0.72 mm.

Selecting the forward gear shim

1. Turn the taper roller bearing outer race
1 2 or 3 times to seat the rollers, and
then measure the bearing height (M1) as
shown.
NOTE:
• Select the shim thickness (T1) by using the
specified measurement(s) and the calcula-
tion formula.
• Measure the bearing outer race at 3 points
to find the height average.
Shimming plate 2: 90890-06701
Digital caliper 3: 90890-06704
1
2
3
4
5
6
7
8
9
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