Hyundai 20G-7, Руководство по обслуживанию

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CYLINDER BLOCK
2-21
INSPECTION
CYLINDER BLOCK
1. Inspect the cylinder block for scratch, fur and rust visually,
check for invisible crack or other deformation using a proper
tool and repair or replace if necessary.
2. Measure flatness of the cylinder block upper surface using
a straight edge and a thickness gauge. When measuring,
the cylinder block upper surface should be flat without a
fragment.
3. Measure the cylinder bore towards A and B directions at 3-
point height using a cylinder gauge. If the cylinder bore is
larger than standard and the cylinder wall is scratched or
furred excessively, bore and hone the cylinder block and
install a new oversize piston and ring.
L4GC031A
Flatness
Parallelism
0.03mm or less
0.15mm or less
Cylinder I.D
Cylinder I.D cylindricity
82.00 ~ 82.03mm
0.01mm
Clearance between piston and cylinder 0.02 ~ 0.04mm
Items
0.25 OS
0.50 OS
0.75 OS
1.00 OS
Size
0.25mm
0.50mm
0.75mm
1.00mm
4. If the top ridge is partially worn, cut it with a ridge reamer.
5. There are 4 kinds of oversize piston.
6. To bore the cylinder bore to the oversize, maintain the clear-
ance between oversize piston and bore and use the same
size of pistons. When measuring the piston O.D, measure
flatness of the skirt thrust surface at 47mm below from the
piston top land.