Yanmar 4JH4E - Piston Pin Bushing

5. Inspection and servicing of basic engine parts
204
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.)
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.)
mm
3JH4E/4JH4E 4JH4-TE/4JH4-HTE
Standard Limit Standard Limit
Piston pin bushing
inside dia.
26.025-26.038 26.068 28.025-28.038 28.068
Oil clearance 0.025-0.043 0.101 0.025-0.043 0.101
008303-01E
Cylinder gauge