Measuring Piston Ring End Gap; Measuring Clearance Between Piston Ring Groove And Piston Ring - Mitsubishi L Series Service Manual

4.3 Measuring piston ring end gap

(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.
Item
No.1 com-
pression
ring
No.2 com-
End gap of ring
pression
ring
Oil ring
4.4 Measuring clearance between piston ring
groove and piston ring
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.
Item
No.1
compres-
sion ring
Clearance between No.2
ring and ring compres-
groove sion ring
Oil ring
Standard Limit
0.15 to 0.30 mm
[0.0059 to 0.0118 in]
1.5 mm
0.15 to 0.30 mm [0.0591
[0.0059 to 0.0118 in] in.]
0.15 to 0.35 mm
[0.0059 to 0.0138 in.]
Standard Limit
0.3 mm
- [0.0118
in.]
0.2 mm
0.05 to 0.09 mm
[0.0079
[0.0020 to 0.0035 in.]
in.]
0.2 mm
0.03 to 0.07 mm
[0.0079
[0.0019 to 0.0028 in.]
in.]
INSPECTION AND REPAIR OF BASIC ENGINE
Measuring piston ring end gap
Measuring piston ring groove
Piston
Cylinder
Ring
6-13