DL06K Interim Tire-4 Diesel Engine Disassembly and Reassembly of Major Components
86
3.2.7. Piston assembly
z Disassembly of piston assembly
Disassemble piston according to the disassembly process.
1) Piston inspection
a) Visual check
z Visually check the pistons for cracks, scuff or wear, paying particular attention to
the ring groove.
b) Clearance between the piston and cylinder liner
z With an outside micrometer,
measure the piston outside diameter
at a point 12 mm away from the lower
end of piston skirt in a direction at a
right angle to the piston pin hole.
z Measure the internal diameter of the
cylinder liner, using the cylinder
internal diameter gauge.
z Measure three spots (top ring contact
part of the cylinder liner, middle part,
and oil ring contact part near the
bottom dead center) to the 45 degree
direction. Then, calculate the average
value, excluding the maximum and minimum value.
z The clearance value can be obtained by detecting the external diameter
measurement value of the piston from the internal diameter measurement value
of the cylinder liner. If this value exceeds the limit of tolerance, replace the piston
or cylinder liner, which is more worn-out.
<Clearance between piston and liner>
(mm)
Standard 0.065 ~ 0.105
12 mm
EH6OM042
EH6OM043
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