Mitsubishi L3C Service Manual

INSPECTION AND REPAIR OF BASIC ENGINE
6-13
4.3 Measuring piston ring end gap
&$87,21
(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
4.4 Measuring clearance between piston ring
groove and piston ring
&$87,21
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.
(4) When the piston ring has been replaced, measure the
clearance again, and if the limit is exceeded, then
replace the piston with a new one.
Measuring piston ring groove
Item Standard Limit
End gap of ring
No.1 com-
pression
ring
0.15 to 0.30 mm
[0.0059 to 0.0118 in]
1.5 mm
[0.0591
in.]
No.2 com-
pression
ring
0.15 to 0.30 mm
[0.0059 to 0.0118 in]
Oil ring
0.15 to 0.35 mm
[0.0059 to 0.0138 in.]
Ring
Piston
Cylinder
Item Standard Limit
Clearance between
ring and ring
groove
No.1
compres-
sion ring
-
0.3 mm
[0.0118
in.]
No.2
compres-
sion ring
0.05 to 0.09 mm
[0.0020 to 0.0035 in.]
0.2 mm
[0.0079
in.]
Oil ring
0.03 to 0.07 mm
[0.0019 to 0.0028 in.]
0.2 mm
[0.0079
in.]

Mitsubishi L3C Specifications

General

Brand	Mitsubishi
Model	L3C
Category	Engine
Language	English