DV11
Operation and Maintenance
86
Measurement and Inspection of Major Parts
Printed in Mar. 2005 PS-MMA0608-E1A
2) Check and measurement
z With naked eyes, inspect the
piston for any wear, crack and
scratch and particularly inspect
carefully at the ring grooves for
any wear.
z With the outside micrometer,
measure the piston's outside
diameter the measuring position is
71.5mm from the piston lower end,
and the direction of measurement
must be perpendicular to the
piston pin direction.
Standard
φ127.739 ∼ φ127.757 mm
a) Cylinder bore diameter
z Measure cylinder liner inside
diameter at 3 points (cylinder
top ring contacting face, middle,
and oil ring contacting face on
BDC) in a direction at an angle
of 45°. Take the mean value
with the largest and smallest
values excepted.
Standard
φ127.990 ∼ φ128.010 mm
b) Piston and cylinder clearance
z The clearance is computed by subtracting the piston outside diameter from
the cylinder liner inside diameter. Replace either piston or cylinder liner,
whichever damaged more, if the clearance is beyond the specified limit.
Standard
0.233 ∼ 0.271 mm
56.8mm
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