TOHATSU BFT75A Service Manual page 427

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CYLINDER BLOCK
Check each cylinder block I.D. code letter [1] in the
position shown, and record it.
• The cylinder block I.D. code letters are for the No.1
and the subsequent number journals when viewed
from the left side.
Cylinder block I.D.: 54 mm (2.1 in)
Code
letter
A
B
C
D
Select the correct bearing by referring to the crankshaft
main journal code number and the cylinder block I.D.
code letter.
Crankshaft main bearing selection table:
Crankshaft
main journal
code number
1
2
3
4
Selection table:
Code
letter
H
G
F
E
D
C
B
Main bearing center thickness: 2.0 mm (0.08 in)
The main bearings are available in the seven I.D. colors
(Black, Brown, Green, Yellow, Pink, Red and White in
this order) [1] at intervals of 0.003 mm (0.0001 in) in
tolerance.
Select the bearings so that the oil clearance is 0.018 –
0.036 mm (0.0007 – 0.0014 in).
Align the projection [2] on the bearing with the cutout in
the cylinder block and in the crankcase.
Install the bearing with care not to damage the sliding
surface.
Check the crankshaft main bearing oil clearance after
installing the selected bearing (page 15-23).
15-26
Tolerance
–0.004 – +0.002 mm (–0.0002 – +0.0001 in)
+0.002 – +0.008 mm (+0.0001 – +0.0003 in)
+0.008 – +0.014 mm (+0.0003 – +0.0006 in)
+0.014 – +0.020 mm (+0.0006 – +0.0008 in)
Cylinder block I.D. code letter
A B
Bearing identification color
White Red Pink
Red Pink Yellow
Pink Yellow Green
Yellow Green Brown
I.D. color Tolerance
–0.004 – –0.001 mm
White
(–0.0002 – –0.00004 in)
–0.001 – +0.002 mm
Red
(–0.00004 – +0.0001 in)
+0.002 – +0.005 mm
Pink
(+0.0001 – +0.0002 in)
+0.005 – +0.008 mm
Yellow
(+0.0002 – +0.0003 in)
+0.008 – +0.011 mm
Green
(+0.0003 – +0.0004 in)
+0.011 – +0.014 mm
Brown
(+0.0004 – +0.0006 in)
+0.014 – +0.017 mm
Black
(+0.0006 – +0.0007 in)
[1]
C D
Yellow
Green
Brown
Black
[2]
No.1 MAIN No.5 MAIN
JOURNAL
JOURNAL
[1]