Selecting The Forward Gear Shim - SELVA MARINE Kingfish 25 Service Manual

Example:
If (M3) is 28.30 mm and "P" is (+5), then
(T3) = 28.30 – 27.00 – (+5)/100 mm
= 28.30 – 27.00 – 0.05 mm
= 1.25 mm
If (M3) is 28.43 mm and "P" is (–3), then
(T3) = 28.43 – 27.00 – (–3)/100 mm
= 28.43 – 27.00 + 0.03 mm
= 1.46 mm
TIP:
"P" is the deviation of the lower case dimen-
sion from standard. The "P" mark c is
stamped on the anode mounting surface of
the lower case in 0.01 mm units. If the "P"
mark is unreadable, assume that "P" is zero
and measure the backlash when the unit is
assembled.
5. Select the pinion shims.
Calculated number (T3)
More than Or less
1.10 1.20
1.20 1.30
1.30 1.40
1.40 1.50
1.50 1.60
1.60 1.70
1.70 1.83
Available shim thicknesses:
0.7, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6 mm
Example:
If (T3) is 1.25 mm, then the pinion shim is 1.3
mm.
If (T3) is 1.46 mm, then the pinion shim is 1.5
mm.

Selecting the forward gear shim

Select the forward gear shims using the mea-
surement(s) and calculation formula.
1. Turn the taper roller bearing outer race
1 2 or 3 times to seat the rollers.
2. Measure the bearing height (M1) at 4
Shimming plate 2: 90890-06701
3. Calculate the forward gear shim thick-
Shim
thickness
(mm)
1.2
1.3
1.4
1.5
1.6
0.7 + 1.0
0.7 + 1.1
Calculation formula:
Example:
If (M1) is 16.32 mm and "F" is (–3), then
(T1) = 17.50 + (–3)/100 – 16.32 mm
If (M1) is 16.25 mm and "F" is (+5), then
(T1) = 17.50 + (+5)/100 – 16.25 mm
points, and then calculate the average.
1
2
ness (T1).
Forward gear shim thickness (T1) =
17.50 + F/100 – M1
= 17.50 – 0.03 – 16.32 mm
= 1.15 mm
= 17.50 + 0.05 – 16.25 mm
= 1.30 mm
Shimming
1
M1
2
a
8
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