TOHATSU BFT250A Service Manual page 492

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GEAR CASE (STANDARD ROTATION)
Remove the trim tab from the gear case (page 16-8).
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 trim tab on the gear case (page 16-9).
After shim selection, inspect the forward bevel gear
backlash (page 16-41).
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
16-38
–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
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