TOHATSU BFT250A Service Manual page 541

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Remove the gear case cover from the gear case (page
17-7).
Cross reference the engagement mark [1] located on
the trim tab installation part of the gear case [2] and the
tolerance calculated in the previous step, and refer to
the pinion gear shim selection table to determine the
required thickness of the shim (Sp).
Pinion gear shim selection table
Select the shims from the pinion gear shims of different
thickness to obtain the required thickness (Sp) by
combining the shims.
Shim type table
Install the gear case cover on the gear case (page 17-
7).
After shim selection, inspect the forward bevel gear
backlash (page 17-40)
HOW TO READ SHIM SELECTION TABLE
When the engagement mark on the gear case housing
is E and the tolerance is –0.20 mm (–0.008 in), the shim
selection table shows that the required shim thickness
is 0.90 mm (0.035 in). (See the table shown below).
Pinion gear shim selection table
–0.37 –0.25 –0.20 –0.15
– – –
–0.25 –0.20 –0.15 –0.10
A 0.80 0.75 0.70 0.65
B 0.85 0.80 0.75 0.70
C 0.90 0.85 0.80 0.75
D 0.95 0.90 0.85 0.80
E 1.00 0.95 0.90 0.85
F 1.05 1.00 0.95 0.90
Shim type Thickness
Shim A 0.10 mm
Shim B 0.15 mm
Shim C 0.30 mm
Shim D 0.50 mm
–0.37 –0.25 –0.20 –0.15
– – –
–0.25 –0.20 –0.15 –0.10
A 0.80 0.75 0.70 0.65
B 0.85 0.80 0.75 0.70
C 0.90 0.85 0.80 0.75
D 0.95 0.90 0.85 0.80
E 1.00 0.95 0.90 0.85
F 1.05 1.00 0.95 0.90
GEAR CASE (COUNTER ROTATION)
Calculation value
–0.10 –0.05 0 +0.05
– – – –
–0.05 0 +0.05 +0.10
0.60 0.55 0.50 0.45
0.65 0.60 0.55 0.50
0.70 0.65 0.60 0.55
0.75 0.70 0.65 0.60
0.80 0.75 0.70 0.65
0.85 0.80 0.75 0.70
Calculation value
–0.10 –0.05 0 +0.05
– – – –
–0.05 0 +0.05 +0.10
0.60 0.55 0.50 0.45
0.65 0.60 0.55 0.50
0.70 0.65 0.60 0.55
0.75 0.70 0.65 0.60
0.80 0.75 0.70 0.65
0.85 0.80 0.75 0.70
[1]
+0.10 +0.15 +0.20 +0.25
– – – –
+0.15 +0.20 +0.25 +0.30
0.40 0.35 0.30 0.25
0.45 0.40 0.35 0.30
0.50 0.45 0.40 0.35
0.55 0.50 0.45 0.40
0.60 0.55 0.50 0.45
0.65 0.60 0.55 0.50
+0.10 +0.15 +0.20 +0.25
– – – –
+0.15 +0.20 +0.25 +0.30
0.40 0.35 0.30 0.25
0.45 0.40 0.35 0.30
0.50 0.45 0.40 0.35
0.55 0.50 0.45 0.40
0.60 0.55 0.50 0.45
0.65 0.60 0.55 0.50
[2]
Unit: mm
+0.30 +0.35
– – –
+0.35 +0.43
0.20 0.15
0.25 0.20
0.30 0.25
0.35 0.30
0.40 0.35
0.45 0.40
Unit: mm
+0.30 +0.35
– – –
+0.35 +0.43
0.20 0.15
0.25 0.20
0.30 0.25
0.35 0.30
0.40 0.35
0.45 0.40
17-37