2--28
62--11161
2.3.3 Piston and Connecting Rod
A
. When Removing
B
. Correct Seat Width
1. Seam
2. Oil Hole
a
. 0.785 rad (45
°
)
2.3.3.a Piston Pin Bore I.D.
1. Measure the piston pin bore I.D. in both the horizontal
and vertical directions with a cylinder gauge.
2. If the measurement exceeds the allowable limit, re-
place the piston.
Piston Pin Bore
I.D.
Factory
Specification
20.000 to 20.013 mm
0.78740 to 0.78791 in.
Allowable
Limit
20.05 mm
0.7894 in.
2.3.3.b Piston Pin and Bushing Clearance
1. Measure the piston pin O.D. with an outside microme-
ter.
2. Measure the connecting rod small end bushing I.D.
with an inside micrometer.
3. If the clearance exceeds the allowable limit, replace
the bushing. If the clearance is still excessive, replace
the piston pin.
Piston Pin to
Small End Bush-
ing Clearance
Factory
Specification
0.014 to 0.038 mm
0.00055 to 0.00150 in.
Allowable
Limit
0.10 mm
0.0039 in.
Piston Pin O.D.
Factory
Specification
20.002 to 20.011 mm
0.78748 to 0.78783 in.
Small End
Bushing I.D
.
Factory
Specification
20.025 to 20.040 mm
0.78839 to 0.78897 in.
2.3.3.c Replacing Connecting Rod Small End Bu-
shing
(A) When Removing
1. Press out the small end bushing using a Small End
Bushing Replacing Tool.
(B) When Installing
1. Clean a new small end bushing and bore, and apply
engine oil to both.
2. Using the small end bushing replacing tool, press in
the new bushing to the specified dimension (see
B
).
NOTE
Be sure to align the bushing so that the oil hole
in the bushing aligns with the oil port in the con-
necting rod.
Piston Pin to
Small End Bush-
ing Clearance
(Replacement
Parts)
Factory
Specification
0.015 to 0.075 mm
0.00059 to 0.00295 in.
Allowable
Limit
0.15 mm
0.0059 in.
Small End
Bushing I.D
.
(Re-
placement Parts)
Factory
Specification
20.026 to 20.77 mm
0.78845 to 0.79043 in.
