TOHATSU BFT75A Service Manual page 426

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CYLINDER BLOCK WARPAGE
Take care not to damage (scores, scratches, etc.) the
mating surface with the cylinder head gasket.
Measure the surface warpage using a straight edge and
a feeler gauge as shown
STANDARD:
SERVICE LIMIT:
If the measurement exceeds the service limit, replace
the cylinder block with a new one.
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, 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 screwdriver to
clean.
Check each crankshaft main journal code number [1] in
the position shown, and record them.
• The main journals are the No.1 and the subsequent
number journals when viewed from the alternator
rotor side.
• The crankshaft main journal code numbers are for
the No.1 and the subsequent number journals when
viewed from the right side.
Crankshaft main journal O.D.: 50 mm (2.0 in)
Code
number
4
3
2
1
0.07 mm (0.003 in) max.
0.10 mm (0.004 in)
Tolerance
–0.024 – –0.018 mm (–0.0009 – –0.0007 in)
–0.018 – –0.012 mm (–0.0007 – –0.0005 in)
–0.012 – –0.006 mm (–0.0005 – –0.0002 in)
–0.006 – ±0.000 mm (–0.0002 – ±0.0000 in)
CYLINDER BLOCK
No.1 No.3
No.2
(No.1 journal and subsequent numbers
viewed from the alternator side)
No.5 MAIN
JOURNAL
No.4 No.5
No.1 MAIN
JOURNAL
[1]
15-25