Joyner JNSZ1100SV, Owner'S Manual

Page: 80 / 132

4. Routine checks
4.1.
Cylinder block
4.1.1. Checks on the levelness of cylinder
top surface
(1). Use a ruler and feeler to do the
measurements of the six parts as shown in
the right figure.
[Limit] 0.08mm
4.1.2. The use of cylinder meter: Measure
the values at the parts as shown in
the right figure and work out the
maximum value and the minimum
value. Replace the cylinder body or
do the boring of the cylinder if the
values exceed the limits.
[Limit] 0.03mm
[ Reference] Circularity
：
A-B or a-b
Cylindricity
：
A-a or B-b
[Reference] Cylinder standard diameter:
φ
72.00-72.01mm
4.2. Piston
4.2.1. Check the clearance between the
piston pinholes.
Use a caliper to measure the positions of
the piston shown in the following figure, with
the maximum value as the size of the piston
pin diameter.
4.2.2. Use the inner diameter centimeter to
measure the positions of the piston
hole diameter shown as the following
figure, take the minimum value as the
size of the pinhole diameter.
4.2.3. Work out the clearance on the basis
of the size difference between the
hole diameter and the pin diameter.
Replace the piston pin or the piston if
the result exceeds the benchmark
value.
[Benchmark] 0.004-0.009mm
[Limit] 0.015mm
Top dead center
Bottom dead center
Measure point