5. Inspection and servicing of basic engine parts
124
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.)
5.4.4 Assembling piston and connecting
rod
The piston and connecting rod should be assembled so
that the match mark on the connecting rod large en
faced the fuel injection pump side and the combustion
chamber above the piston is close to the fuel injection
pump.
mm
Standard
Limit
Piston pin metal
I.D.
22.025-22.038
22.068
Pin O.D.
21.991-22.000
21.963
Clearance
0.025-0.047
0.105
Cylinder gage
(Connecting rod small end)
Piston ID mark
Camshaft side
Nozzle side
Piston ID mark
Embossed mark
(Flywheel side)
Match mark
Cylinder size mark
(Flywheel side)
Assembly direction of connecting
rod and piston
(
)
Summary of Contents for 3YM30
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