Inspection; Piston-To-Cylinder Clearance - Honda BF40D Bedienungsanleitung

2. INSPECTION

1 • PISTON SKIRT O.D.
1) Check the piston outer surface for damage (scores,
scratches, etc.). Check the piston for warpage and cracks.
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2) Measure and record the piston O.D. at 10 mm (0.4 in) from
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the bottom and at right angles to the piston pin bore.
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Standard
69.970 - 69.990 mm
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(2.7547 - 2.7555 in)
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3) If the measurement is less than the service limit, replace
the piston with a new one.
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8
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10
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• CYLINDER SLEEVE I.D.
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1) Check the inner wall of the cylinder for damage (scores,
scratches, etc.).
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2) Measure and record the cylinder I.D. at three levels in both
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X and Y axes. Take the maximum reading to determine the
cylinder I.D.
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Standard
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70.000 - 70.015 mm
(2.7559 - 2.7565 in)
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3) If the measurement exceeds the service limit, replace the
cylinder block with a new one.
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• PISTON-TO-CYLINDER CLEARANCE

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Determine the difference between the piston skirt O.D. and the
cylinder sleeve I.D.
Standard
0.010 - 0.045 mm
(0.0004 - 0.0018 in)
If the measurement exceeds the service limit, replace the
cylinder block with a new one.
10-10
10 mm
(0.4 in)
Service limit
69.910 mm
(2.7524 in)
Service limit
70.060 mm
(2.7583 in)
Service limit
0.090 mm
(0.0035 in)
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[1] O.D.
o
90
[1]
TOP
[2]
[3]
MIDDLE
BOTTOM
[1]
TOP
X
Y
[2]
[3]
MIDDLE
BOTTOM