Measuring Clearance Between Piston Ring Groove And Piston Ring; Measuring Piston Pin Bore Diameter And Piston Pin Outside Diameter - Mitsubishi S6S-Y3T61HF Service Manual

4.5 Measuring clearance between piston ring
groove and piston ring
CAUTION
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
compression ring
Clearance
between
No. 2
piston
compression ring
ring
groove
Oil ring
4.6 Measuring piston pin bore diameter and
piston pin outside diameter
Measure the piston pin bore diameter and piston pin outside
diameter. Replace if the limit is exceeded.
Item Nominal
Piston pin ø 30 mm
outside diameter [1.18 in.]
Clearance between
-
piston pin
Standard Limit
0.07 to 0.11 mm 0.200 mm
[0.0028 to 0.0043 in.] [0.0079 in.]
0.045 to 0.085 mm 0.150 mm
[0.0018 to 0.0033 in.] [0.0059 in.]
0.020 to 0.060 mm 0.150 mm
[0.0008 to 0.0024 in.] [0.0059 in.]
Standard Limit
29.994 to 30.000 mm
[1.1809 to 1.1811 in.]
0.000 to 0.016 mm 0.050 mm
[0.0000 to 0.0006 in.] [0.0020 in.]
INSPECTION AND REPAIR OF BASIC ENGINE
Measuring clearance between piston ring groove and
-
Measuring piston pin bore diameter and piston pin
piston ring
Measuring
points
outside diameter
Measuring
directions
6-19