TOHATSU BFT75A Service Manual page 425

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CYLINDER BLOCK
Remove the crankcase.
Measure the compressed width of the plastigauge [1]
using the scale [2] printed on the bag of the
plastigauge.
• Take the widest width on the plastigauge.
STANDARD:
0.018 – 0.036 mm (0.0007 – 0.0014 in)
SERVICE LIMIT:
0.050 mm (0.0020 in)
If the measurement exceeds the service limit, replace
the main bearing with an undersize bearing by referring
to the crankshaft main bearing selection table (page 15-
25). Recheck the oil clearance.
If the measurement still exceeds the service limit after
replacing the main bearing, replace the crankshaft with
a new one.
CONNECTING ROD BEARING OIL
CLEARANCE
Clean the crank pin and the bearing of the connecting
rod cap assembly.
Check the crank pin and the bearing for wear and
damage.
Install the crankshaft on the cylinder block.
Install the connecting rod cap assembly on the
connecting rod, and tighten the connecting rod bolts to
the specified torque (page 15-10).
Remove the connecting rod cap assembly, and set a
plastigauge [1] on the crank pin as shown
• Set the plastigauge in the axial direction.
• Avoid the oil passage in the bearing journal to set
the plastigauge.
Reinstall the connecting rod cap assembly on the
connecting rod, and tighten the connecting rod bolts to
the specified torque (page 15-13).
• Tighten the connecting rod bolts with care not to turn
the crankshaft and/or the connecting rod.
Remove the connecting rod cap assembly.
Measure the compressed width of the plastigauge [1]
using the scale [2] printed on the bag of the
plastigauge.
• Measure the widest width on the plastigauge.
STANDARD:
0.020 – 0.038 mm (0.0008 – 0.0015 in)
SERVICE LIMIT:
0.050 mm (0.0020 in)
If the measurement exceeds the service limit, replace
with an undersize bearing by referring to the connecting
rod bearing selection table (page 15-27).
Recheck the connecting rod bearing oil clearance.
If the measurement still exceeds the service limit after
replacing the connecting rod bearing, replace the
crankshaft with a new one.
15-24
[1]
[2]
[1]
[2]
[1]