TOHATSU BFT115A Service Manual page 494

CYLINDER BLOCK
Select the correct bearing by referring to the cylinder
block I.D. code letter or number and the crankshaft
main journal code number.
Crankshaft main bearing selection table
Crankshaft main
journal code
IDENTIFICATION TABLE
Main bearing center thickness: 2.0 mm (0.079 in)
Code
F
E
D
C
B
A
New main bearings are available in six sizes, identified
by color, in increments of 0.003 mm (0.0001 in).
Note that the bearings are selected so that the No. 1, 2,
4, 5 journal oil clearance is in the range between 0.017
– 0.041 mm (0.0007 – 0.0016 in) and that the No. 3
journal oil clearance is in the range between 0.025 –
0.049 mm (0.0010 – 0.0019 in).
Apply molybdenum disulfide oil to the crankshaft mating
surface. Do not apply to the cylinder block and lower
block mating surface.
Align the bearing lug (1) with the grooves in the lower
block and cylinder block, and assemble carefully not to
damage the sliding surface.
After installing the selected bearing(s), measure the oil
clearance (page 15-41).
• Be sure to measure the connecting rod bearing oil
clearance after selecting the bearing by referring to
the selection table.
• If the two bearing I.D. colors are shown on the
selection table, use a bearing of the respective
colors.
15-46
1 or A or I
number
1 Pink
2 Pink/Yellow
3 Yellow
4 Green
5 Green/Brown
6 Brown
Color Tolerance ranges
Pink -0.006 – -0.003 mm
(-0.0002 – -0.0001 in)
Yellow -0.003 – ±0.000 mm
(-0.0001 – ±0.0000 in)
Green ±0.000 – +0.003 mm
(±0.0000 – +0.001 in)
Brown +0.003 – +0.006 mm
(+0.001 – +0.002 in)
Black +0.006 – +0.009 mm
(+0.002 – +0.004 in)
Blue +0.009 – +0.012 mm
(+0.004 – +0.005 in)
Cylinder block I.D. code number or letter
2 or B or II 3 or C or III
Bearing I.D. color
Pink/Yellow Yellow
Yellow
Green Green/Brown
Green/Brown Brown
Brown
Black Black/Blue
(1)
4 or D or IIII
Green
Green Green/Brown
Brown
Black
Black Black/Blue
Blue
IDENTIFICATION COLOR