Hyundai HDF 50-7S, Service Manual

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INSPECTION AND REPAIR OF BASIC ENGINE
6-19
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.
Measuring clearance between piston ring groove and
piston 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.
Measuring piston pin bore diameter and piston pin
outside diameter
Item Standard Limit
Clearance
between
piston
ring
groove
No. 1
compression ring 0.07 to 0.11 mm
[0.0028 to 0.0043 in.]
0.200 mm
[0.0079 in.]
No. 2
compression ring 0.045 to 0.085 mm
[0.0018 to 0.0033 in.]
0.150 mm
[0.0059 in.]
Oil ring
0.020 to 0.060 mm
[0.0008 to 0.0024 in.]
0.150 mm
[0.0059 in.]
Item Nominal Standard Limit
Piston pin
outside diameter ø 30 mm
[1.18 in.]
29.994 to 30.000 mm
[1.1809 to 1.1811 in.]
-
Clearance between
piston pin
-
0.000 to 0.016 mm
[0.0000 to 0.0006 in.]
0.050 mm
[0.0020 in.]
Measuring
points
Measuring
directions
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