INSPECTION AND REPAIR OF BASIC ENGINE
6-12
4.3 Measuring piston ring groove
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Remove carbon deposits from pistons and check the
entire circumference of the piston.
(1) Remove deposits such as carbon from each ring groove.
(2) Check each ring groove for wear or damage. If it is
worn or damaged, replace the piston with a new one.
(3) Insert the piston ring into the piston ring groove. Apply
a straight edge and insert thickness gauges to measure
the clearance between ring and ring groove.
If the limit is exceeded, replace the piston ring with a
new one.
Measuring piston ring groove
4.4 Measuring piston ring end gap
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(a) When replacing rings without boring (honing),
measure the end gap at the bottom of the cylinder
where the wear is minimum.
(b) When replacing the ring, use the ring of the same
size as the piston.
Insert the piston ring into the cylinder bore and push it with
the piston to achieve squareness. Then measure the end gap
with feeler gauges. Replace the piston ring if the limit is
exceeded.
Measuring piston ring end gap
Item Standard Limit
Clearance
between
piston ring
and ring
groove
No.1
compression ring
0.09 to 0.11 mm
[0.0035 to 0.0043 in.]
0.30 mm
[0.0118 in.]
No.2
compression ring
0.07 to 0.11 mm
[0.0028 to 0.0043 in.]
0.20 mm
[0.0079 in.]
Oil ring
0.03 to 0.07 mm
[0.0012 to 0.0028 in.]
0.20 mm
[0.0079 in.]
No.1 compression ring
No.2 compression ring
Item Standard Limit
Piston ring
end gap
No.1
compression ring
0.15 to 0.30 mm
[0.0059 to 0.0118 in.]
1.50 mm
[0.0591 in.]
No.2
compression ring
0.15 to 0.35 mm
[0.0059 to 0.0138 in.]
Oil ring
0.20 to 0.40 mm
[0.0079 to 0.0157 in.]
Thickness gauge
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