Honda BF135A Manual page 455

• CRANKSHAFT MAIN BEARING OIL CLEARANCE
1) Clean the crankshaft main journals and the main bearings.
Check the journals and the bearings for damage and wear.
2) Install the upper main bearings and the crankshaft on the
cylinder block. Install the lower main bearings and the
lower block and tighten the bolts to the specified torque (P.
13-24).
3) Remove the lower block and the lower main bearings. Set
the plastigauge on each main journal of the crankshaft as
shown.
NOTICE
• Set the plastgauges in the axial direction.
• Do not turn the crankshaft during this check.
4) Reinstall the lower main bearings and the lower block.
Tighten the bolts to the specified torque (P. 13-24).
5) Remove the lower block and the lower main bearings.
Measure the pressured width of the plastigauge using the
scale printed on the bag of the plastigauge.
NOTICE
Measure the widest width on the plastigauge.
0.017 – 0.041 mm
No.1, 2, 4, 5
(0.0007 – 0.0016 in)
0.025 – 0.049 mm
No.3
(0.0010 – 0.0019 in)
6) If the measurement exceeds the service limit, check the
lower block and the cylinder block main bearing I.D. and
the crankshaft main journal O.D. If they are OK, replace
with the undersize bearing by referring to the connecting
rod bearing selection table (P. 13-18), and measure the oil
clearance again.
• CONNECTING ROD BOLT
1) Measure the O.D. of each connecting rod bolt at two points
as shown, and
measurements.
STANDARD
2) If the gap exceeds the standard value, replace the
connecting rod bolt.
NOTICE
Measure the O.D. on each of the connecting rod bolt.
13-14
STANDARD SERVICE LIMIT
0.055 mm
(0.0022 in)
calculate the gap between
0 – 0.1 mm (0 – 0.004 in)
[1] PLASTIGAUGE
0.05 mm
(0.002 in)
the
[1]
PLASTIGAUGE
35 mm (1.4 in)
20 mm (0.8 in)
[2]
SCALE