Honda BF40D - Inspection

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2. INSPECTION
• PISTON SKIRT O.D.
1) Check the piston outer surface for damage (scores,
scratches, etc.). Check the piston for warpage and cracks.
2) Measure and record the piston O.D. at 10 mm (0.4 in) from
the bottom and at right angles to the piston pin bore.
• CYLINDER SLEEVE I.D.
1) Check the inner wall of the cylinder for damage (scores,
scratches, etc.).
2) Measure and record the cylinder I.D. at three levels in both
X and Y axes. Take the maximum reading to determine the
cylinder I.D.
Standard Service limit
69.970
- 69.990 mm 69.910 mm
(2.7547
- 2.7555 in) (2.7524 in)
3) If the measurement is less than the service limit, replace
the piston with a new one.
[1] O.D.
[1]
TOP
[2]
MIDDLE
[3]
BOTTOM
[1]
TOP
X
Y
[2]
MIDDLE
[3]
BOTTOM
10 mm
(0.4 in)
90
o
Standard Service limit
70.000
- 70.015 mm 70.060 mm
(2.7559
- 2.7565 in) (2.7583 in)
3) If the measurement exceeds the service limit, replace the
cylinder block with a new one.
• PISTON-TO-CYLINDER CLEARANCE
Determine the difference between the piston skirt O.D. and the
cylinder sleeve I.D.
If the measurement exceeds the service limit, replace the
cylinder block with a new one.
Standard Service limit
0.010
- 0.045 mm 0.090 mm
(0.0004
- 0.0018 in) (0.0035 in)
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