Bearing Selection - TOHATSU BFT250A Service Manual

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CYLINDER BLOCK

BEARING SELECTION

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.: 77.00 mm (3.031 in)
Code
number
A or I
B or II
C or III
D or IIII
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 timing belt arrow-mark side.
Crankshaft main journal: 72.00 mm (2.835 in)
Code
number
6 or IIIIII
5 or IIIII
4 or IIII
3 or III
2 or II
1 or I
15-36
Tolerance ranges
±0.000 – +0.006 mm (±0.0000 – +0.0002 in)
+0.006 – +0.012 mm (+0.0002 – +0.0005 in)
+0.012 – +0.018 mm (+0.0005 – +0.0007 in)
+0.018 – +0.024 mm (+0.0007 – +0.0009 in)
Tolerance ranges
-0.024 – -0.020 mm (-0.0009 – -0.0008 in)
-0.020 – -0.016 mm (-0.0008 – -0.0006 in)
-0.016 – -0.012 mm (-0.0006 – -0.0005 in)
-0.012 – -0.008 mm (-0.0005 – -0.0003 in)
-0.008 – -0.004 mm (-0.0003 – -0.0002 in)
-0.004 – ±0.000 mm (-0.0002 – ±0.0000 in)
No.1 MAIN JOURNAL
(TIMING BELT SIDE)
CRANKSHAFT MAIN JOURNAL
No.1 MAIN JOURNAL
(TIMING BELT SIDE)
No.2 MAIN
No.1 MAIN
JOURNAL
JOURNAL
No.4 MAIN JOURNAL
(OIL PUMP SIDE)
No.4 MAIN JOURNAL
(OIL PUMP SIDE)
No.3 MAIN
JOURNAL
No.4 MAIN
JOURNAL