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4) Piston and piston ring
Disassembly
(1) Remove the piston ring using a piston ring tool.
(2) Remove the snap ring and extract the piston pin.
Inspection
(1) Piston
a. Check the piston for crack, streak and burnout
on the outside surface and replace if remarkable.
b. Measure the longer diameter at 10 mm above the
lower end of the piston skirt and bore of the
cylinder in the thrust direction, calculate the
clearance, and replace if the repair value is
exceeded.
Clearance between cylinder and piston (mm)
Model
Standard
assembling value
Service limit
J843·N843L 0.0375 – 0.0715 0.25
Piston skirt bottom longer dia. (mm)
Model
Standard
assembling value
Service limit
J843·N843L φ83.9475 – 83.96 φ83.7
Model Piston size Skirt bottom longer dia.
J843
S.T.D
83.9475
– 83.9625
N843L
S.T.D
83.9475
– 83.9625
d. Measure the piston pin hole diameter and piston
pin outside diameter and replace if the clearance
exceeds the service limit.
Clearance between piston pin hole and piston pin (mm)
Standard assembling value Service limit
-0.001 – +0.007 0.02
024X
025X
026X
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