SELVA MARINE Blue Whale 250 EFI Service Manual page 217

A – 3
b
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.
Calculation formula:
Reverse gear shim thickness (T2) =
21.00 + R/100 – A/100 – M2
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
6P23H11
B
S69J6625
Shimming (regular rotation model)
3. Select the reverse gear shim(s) (T2) 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
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.
Rounded numeral
0
2
5
8
6-26
1
2
3
4
5
6
7
8
9