Honda BF40D - Page 190

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• THRUST WASHER SIDE CLEARANCE
Measure the clearance between the main journal thrust washer
and the crankshaft.
• CRANKSHAFT MAIN BEARING OIL CLEARANCE
1) Clean the crankshaft main journals and main bearings, and
check the journals and the bearings for wear or damage.
2) Install the four main bearings and crankshaft on the
cylinder block, and install the four main bearings on the
crankcase.
3) Install the crankcase on the cylinder block, and tighten the
bolts to the specified torque (P. 10-28).
4) Remove the crankcase. Set the plastigauge on each main
journal of the crankshaft.
• Set the plastigauge in the axial direction.
• Avoid the oil passage in the bearing journal to set the
plastigauge.
5) Reinstall the crankcase on the cylinder block, and tighten
the bolts to the specified torque (P. 10-28).
• Do not turn the crankshaft during this check.
6) Remove the crankcase. Measure the compressed width on
the plastigauge using the scale printed on the bag of the
plastigauge.
• Take the widest width on the plastigauge.
Standard Service limit
0.05
- 0.30 mm 0.45 mm
(0.002
- 0.012 in) (0.018 in)
If the measurement exceeds the service limit, check the thrust
washer and the cylinder block thrust surface. Replace the
thrust washer with a new one if necessary and recheck.
If the measurement still exceeds the service limit after
replacing the thrust washer, replace the crankshaft with a new
one.
Standard Service limit
0.021
-
0.039 mm 0.050 mm
(0.0008
- 0.0015 in) (0.0020 in)
7) If the measurement exceeds the service limit, replace the
main bearing with an undersize bearing by referring to the
main bearing selection table (P. 10-19). Recheck the oil
clearance.
If the measurement still exceeds the service limit, replace
the crankshaft with a new one.
[1]
PLASTIGAUGE
[1]
PLASTIGAUGE
[2]
SCALE
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