Hyundai HDF 50-7S, Service Manual

Page: 395 / 518

INSPECTION AND REPAIR OF BASIC ENGINE
6-17
4.2 Measuring cylinder inside diameter
(1)
Measure the inside diameter of the cylinder at three
levels, i.e., upper (with much stepped wear), middle,
and lower levels, in both directions parallel to and
perpendicular to the crankshaft direction.
(2)
If the measurement is between the repair limit and
replacement limit, re-bore the cylinder to +0.25 mm
[0.0098 in.] or +0.5 mm [0.0197 in.] oversize. Hone the
re-bored cylinder to the accuracy of the standard.
(3)
Use an oversize piston and piston rings to fit the re-
bored cylinder.
(4)
If the cylinder is worn unevenly, select an oversize
diameter that ensures complete roundness when the
cylinder is re-bored to the maximum. All cylinders
must be re-bored to the same oversize diameter if one
cylinder is re-bored.
(5)
If the cylinder has a slight wear and is reused after
replacing only the piston rings, remove the steps in
worn portion in the upper part of the cylinder using a
ridge reamer. Hone it as necessary.
Measuring cylinder sleeve inside diameter
Refacing using a ridge reamer
Item Standard Limit
Cylinder
inside diameter 94.000 to 94.035 mm
[3.7008 to 3.7022 in.]
Repair limit:
94.200 mm [3.7087 in.]
Replace limit:
94.700 mm [3.7283 in.]
Circularity
0.01 mm
[0.0004 in.] or less
-
Cylindricity
0.015 mm
[0.0006 in.] or less
-
1
1
[0.43]
80 [3.15]
150 [5.91]
Measuring
directions
Measuring
points
Unit: mm [in.]
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