Honda HRN216 Series Manual page 148

HRN216
PISTON RING WIDTH
Measure each piston ring width.
STANDARD:
Top: 0.935 – 0.950 mm (0.0368 – 0.0374 in)
Second: 0.975 – 0.990 mm (0.0384 – 0.0390 in)
Oil: 2.380 – 2.460 mm (0.0937 – 0.0969 in)
SERVICE LIMIT:
Top:
Second:
Oil:
If any of the measurements is less than the service limit, replace
the piston rings (top, second, oil) as a set.
PISTON RING SIDE CLEARANCE
Measure the clearance between each piston ring and ring groove
of the piston using feeler gauge.
STANDARD:
Top: 0.055 – 0.089 mm (0.0022 – 0.0035 in)
Second: 0.015 – 0.049 mm (0.0006 – 0.0019 in)
Oil: 0.045 – 0.144 mm (0.0018 – 0.0057 in)
SERVICE LIMIT:
Top:
Second:
Oil:
If the calculated clearance is more than the service limit, replace
the piston rings (top, second, oil) as a set and recheck the
clearance.
If the clearance is still more than the service limit with the new
piston ring, replace the piston.
PISTON RING END GAP
Before inspection, check whether the cylinder sleeve I.D. is within
the specification (P. 10-24).
Put the piston ring in the cylinder and then use the piston crown to
push the ring down.
This will make the piston ring horizontal so ring end gap can be
measured.
Measure each piston ring [1] end gap using a feeler gauge.
STANDARD:
Top:
Second:
Oil (side rail):
SERVICE LIMIT:
Top/Second/oil:
If any of the measurements is more than the service limit, replace
the piston rings (top, second, oil) as a set.
Do not hone the cylinder.
0.890 mm (0.0350 in)
0.930 mm (0.0366 in)
2.370 mm (0.0933 in)
0.190 mm (0.0075 in)
0.15 mm (0.006 in)
0.240 mm (0.0094 in)
0.20 – 0.30 mm (0.008 – 0.012 in)
0.30 – 0.40 mm (0.012 – 0.016 in)
0.20 – 0.45 mm (0.008 – 0.018 in)
1.0 mm (0.04 in)
CAMSHAFT/CRANKSHAFT/ PISTON/CYLINDER
[1]
10-25