Piston Pin Bushing; Assembling Piston And Connecting Rod - Yanmar 3YM30 Service Manual

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 metal
22.025-22.038
I.D.
Pin O.D. 21.991-22.000
Clearance 0.025-0.047
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 end
faced the fuel nozzle side and the combustion chamber
above the piston is close to the fuel nozzle.
Standard Limit
22.068
21.963
0.105
5. Inspection and servicing of basic engine parts
mm
Cylinder gage
(Connecting rod small end)
(Flywheel side)
Cylinder size mark
Piston ID mark
Assembly direction of connecting
(
rod and piston
124R1
Piston ID mark
Embossed mark
(Flywheel side)
Match mark
)