ENGINE
GL6000A-AU-B, GL6000D-AU-B,GL9000A-AU-B, GL9000D-AU-B, WSM
1-S51
(3) Piston and Connecting Rod
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, replace the
piston.
9Y1211607ENS0085US0
Oil Clearance between Piton Pin and Small End Bushing
1. Measure the piston pin O.D. where it contacts the bushing with
an outside micrometer.
2. Measure the small end bushing I.D. with an inside micrometer,
and calculate the oil clearance.
3. If the oil clearance exceeds the allowable limit, replace the
bushing. If it still exceeds the allowable limit, replace the piston
pin.
9Y1211607ENS0086US0
Replacing Small End Bushing
(When removing)
1. Press out the used bushing using a small end bushing replacing
tool. (Refer to "SPECIAL TOOLS")
(When installing)
1. Clean a new small end bushing and small end hole, and apply
engine oil to them.
2. Using a small end bushing replacing tool, press in a new
bushing (service parts) taking care to see that the position of the
connecting rod oil hole matches the bushing hole.
[Servicing parts dimension]
9Y1211607ENS0087US0
Piston pin bore I.D.
Factory specification
20.000 to 20.013 mm
0.78741 to 0.78791 in.
Allowable limit
20.05 mm
0.7894 in.
Oil clearance between
piston pin and small end
bushing
Factory specification
0.014 to 0.038 mm
0.00056 to 0.0014 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.
Oil clearance between
piston pin and small end
bushing (Spare parts)
Factory specification
0.015 to 0.075 mm
0.00059 to 0.0029 in.
Allowable limit
0.15 mm
0.0059 in.
Small end bushing I.D.
(Spare parts)
Factory specification
20.026 to 20.077 mm
0.78843 to 0.79043 in.
(1) Seam
(2) Oil Hole
(A) When Removing
(B) When Installing
(a) 0.79 rad (45°)
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