SELVA MARINE Blue Whale 250 EFI Service Manual page 247

NOTE:
"F" is the deviation of the lower case dimen-
sion from standard. The "F" mark a is
stamped on the trim tab mounting surface of
the lower case in 0.01 mm units. If the "F"
mark is unreadable, assume that "F" is zero
and check the backlash when the unit is
assembled.
Calculation formula:
Reverse gear shim thickness (T1) =
30.60 + F/100 – M1
Example:
If "M1" is 29.94 mm and "F" is (+5), then
T1 = 30.60 + (+5)/100 – 29.94 mm
= 30.60 + 0.05 – 29.94 mm
= 0.71 mm
If "M1" is 29.94 mm and "F" is (+4), then
T1 = 30.60 + (+4)/100 – 29.94 mm
= 30.60 + 0.04 – 29.94 mm
= 0.70 mm
3. Select the reverse gear shim(s) (T1) 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 (counter rotation model)
Example:
If "T1" is 0.71 mm, then the reverse gear
shim is 0.70 mm.
If "T1" is 0.70 mm, then the reverse gear
shim is 0.68 mm.
1
2
3
4
5
6
7
8
9
6-56