SELVA MARINE Blue Whale 250 EFI, Service Manual

Page: 217 / 377

6P23H11
6-26
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2
3
4
5
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7
8
9
NOTE:
“ R ” is the deviation of the lower case dimen-
sion from standard, and “ A ” is the deviation of
the propeller shaft housing from standard.
The
“ R ” mark
a
is stamped on the trim tab
mounting surface of the lower case, and the
“ A ” mark
b
is stamped on the propeller shaft
housing in 0.01 mm units. If the “ R ” mark or
“ A ” mark is unreadable, assume that “ R ” and
“ A ” are zero and check the backlash when
the unit is assembled.
Example:
If
“ M2 ” is 19.92 mm and “ R ” is ( – 1) and “ A ” is
( – 3), then
T2 = 21.00 + ( – 1)/100 – ( – 3)/100 – 19.92 mm
= 21.00 – 0.01 + 0.03 – 19.92 mm
= 1.10 mm
If “ M2 ” is 19.92 mm and “ R ” is (+3) and “ A ” is
( – 5), then
T2 = 21.00 + (+3)/100 – ( – 5)/100 – 19.92 mm
= 21.00 + 0.03 + 0.05 – 19.92 mm
= 1.16 mm
3. Select the reverse gear shim(s) (T2) as
follows.
Example:
If
“ T2 ” is 1.10 mm, then the reverse gear
shim is 1.08 mm.
If
“ T2 ” is 1.16 mm, then the reverse gear
shim is 1.15 mm.
Calculation formula:
Reverse gear shim thickness (T2) =
21.00 + R/100
– A/100 – M2
A – 3 B
S69J6625
b
Calculated numeral
at 1/100 place
Rounded numeral
1, 2 0
3, 4, 5 2
6, 7, 8 5
9, 10 8
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and
0.50 mm
Shimming (regular rotation model)