SELVA MARINE Kingfish 25 Service Manual page 282

TIP:
• If the shim thickness adjustment value is
positive, the current shim thickness must
be increased by that amount and, if the
value is negative, the current shim thick-
ness must be decreased by that amount.
• The gray-colored area on the selection
chart indicates the range of the specified
backlash. Shimming is not required if the
measured backlash is within the gray-col-
ored area.
• The values for the shim thickness adjust-
ments specified in the selection chart are
intended to achieve the median value
within the range for the specified forward or
reverse gear backlash.
• The table below selection chart shows the
shim thickness adjustments for the points
marked on the chart.
4. Calculate the new forward gear shim
thickness (T1).
Calculation formula:
New forward gear shim thickness (T1) = Cur-
rent forward gear shim thickness + Shim
thickness adjustment
Example:
If the current forward gear shim thickness is
0.50 mm and the shim thickness adjustment
is 0.20 mm, then
(T1) = 0.50 mm + 0.20 mm
= 0.70 mm
If the current forward gear shim thickness is
0.50 mm and the shim thickness adjustment
is –0.20 mm, then
(T1) = 0.50 mm + (–0.20) mm
= 0.50 mm – 0.20 mm
= 0.30 mm
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40,
0.50 mm
Shimming (high thrust model)
TIP:
• Use the fewest number of shims to obtain
the required shim thickness.
• If the calculated shim thickness cannot be
obtained with a combination of the avail-
able shims, decrease the shim thickness by
0.01 mm.
5. Install the shims (T1) and taper roller
bearing outer race.
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