Piston Pin Bushing - Yanmar 3JH4E Service Manual

5. Inspection and servicing of basic engine parts

5.4.3 Piston pin bushing

(1) Measuring piston pin clearance.
Excessive piston pin bushing wear may result
in damage to the piston pin or the piston itself.
Measure the piston pin bushing inside
diameter and the piston pin outside diameter.
Calculate the oil clearance from the measured
values. (Refer to 5.3.2 for the piston pin.)
Piston pin bushing
inside dia.
Oil clearance
Note:
Since the rod small end is tapered, bush
insertion is extremely difficult. Any minor mistake
will cause abnormalities such as twist and bite.
Do not insert the bush on-site.
(No piston pin bush spare part is available. It is
included in the connecting rod assembly
supplied as a spare part.)
3JH4E/4JH4E
Standard
26.025-26.038
0.025-0.043
Limit Standard
26.068 28.025-28.038
0.101 0.025-0.043
204
Cylinder gauge
008303-01E
4JH4-TE/4JH4-HTE
Limit
28.068
0.101
mm