TOHATSU BFT115A Service Manual page 493

CRANKSHAFT MAIN BEARING
• When replacing the main bearing, check the
crankshaft main journal code number and the
cylinder block I.D. code letter or number, and select
the correct bearing by referring to the bearing
selection table.
• If the code letter and/or number is not clear, clean
the area with a cleaning solvent and check again. Do
not scrub with a stiff wire brush or scraper to clean.
Check the cylinder block I.D. code letters or numbers
and record them.
• The cylinder block I.D. code letters or numbers are
for the No.1 and the subsequent number journals
when viewed from the left side code.
Cylinder block I.D.: 59.00 mm (2.323 in)
Code number
1 or A or I ±0.000 – +0.006 mm
(±0.0000 – +0.0002 in)
2 or B or II +0.006 – +0.012 mm
(+0.0002 – +0.0005 in)
3 or C or III +0.012 – +0.018 mm
(+0.0005 – +0.0007 in)
4 or D or IIII +0.018 – +0.024 mm
(+0.0007 – +0.0009 in)
Check the crankshaft main journal code numbers and
record them.
• The crankshaft main journal code numbers are for
the No.1 and subsequent number journals when
viewed from the crankshaft pulley side.
Crankshaft main journal O.D. 55.00 mm (2.165 in)
No. 1, 2, 4, 5 crankshaft main journal
Code Tolerance ranges
1 +0.008 – +0.004 mm (+0.0003 – +0.0002 in)
2 +0.004 – ±0.000 mm (+0.0002 – ±0.0000 in)
3 ±0.000 – -0.004 mm (±0.0000 – -0.0002 in)
4 -0.004 – -0.008 mm (-0.0002 – -0.0003 in)
5 -0.008 – -0.012 mm (-0.0003 – -0.0005 in)
6 -0.012 – -0.016 mm (-0.0005 – -0.0006 in)
No. 3 crankshaft main journal
Code Tolerance ranges
1 ±0.000 – -0.004 mm (±0.0000 – -0.0002 in)
2 -0.004 – -0.008 mm (-0.0002 – -0.0003 in)
3 -0.008 – -0.012 mm (-0.0003 – -0.0005 in)
4 -0.012 – -0.016 mm (-0.0005 – -0.0006 in)
5 -0.016 – -0.020 mm (0.0006 – 0.0008 in)
6 -0.020 – -0.024 mm (0.0008 – 0.0009 in)
Tolerance ranges
CYLINDER BLOCK
CYLINDER BLOCK
CODE LOCATION:
No.5 MAIN JOURNAL
(FLYWHEEL SIDE)
No.1 MAIN JOURNAL
(CAM CHAIN SIDE)
CRANKSHAFT MAIN JOURNAL CODE LOCATION:
No.1 MAIN
No.2 MAIN
JOURNAL
JOURNAL
No.3 MAIN
JOURNAL
No.5 MAIN
JOURNAL
(FLYWHEEL
SIDE)
No.5 MAIN
JOURNAL
No.4 MAIN
JOURNAL
No.1 MAIN
JOURNAL
(CAM CHAIN
SIDE)
15-45