TOHATSU BFT250A Service Manual page 453

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Select the correct bearing by referring to the crankpin
code letter and the connecting rod code number.
Connecting rod bearing selection table
Crankpin
code letter
A or I
B or II
C or III
D or IIII
E or IIIII
F or IIIIII
Connecting rod bearing identification table
Connecting rod bearing center thickness: 1.5 mm
(0.06 in)
Number I.D. color
E
D
C
B
A
When using bearing halves of different colors, use one
of each color. It does not matter which color is used in
the top or bottom.
Note that the bearings are selected so that the oil
clearance is in the range between 0.020 – 0.044 mm
(0.0008 – 0.0017 in).
Be sure to measure the oil clearance after installing the
selected bearing(s) (page 15-35).
Apply molybdenum disulfide oil to the crankshaft mating
surface. Do not apply to the connecting rod and
connecting rod cap mating surfaces.
Align the bearing tab [1] with the grooves in the
connecting rod and cap, and install with care not to
damage the sliding surface.
• 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.
Connecting rod code number
1 or I 2 or II 3 or III
Bearing I.D. color
Pink/
Pink Yellow
Yellow
Pink/ Yellow/
Yellow
Yellow Green
Yellow/
Yellow Green
Green
Yellow/ Green/
Green
Green Brown
Green/
Green Brown
Brown
Green/ Brown/
Brown
Brown Black
Tolerance ranges
–0.005 – –0.001 mm
Pink
(–0.0002 – –0.00004 in)
–0.001 – +0.003 mm
Yellow
(–0.00004 – +0.0001 in)
+0.003 – +0.007 mm
Green
(+0.0001 – +0.0003 in)
+0.007 – +0.011 mm
Brown
(+0.0003 – +0.0004 in)
+0.011 – +0.015 mm
Black
(+0.0004 – +0.0006 in)
4 or IIII
Yellow/
Green
Green
Green/
Brown
Brown
Brown/
Black
Black
[1]
CYLINDER BLOCK
IDENTIFICATION COLOR
15-39