S-58
WG972-E2, DF972-E2, WSM
GASOLINE / LPG ENGINE
(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.
W1065759
Oil Clearance between Piston Pin and Small End Bushing
1. Measure the O.D. of the piston pin 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.
W1065897
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 bore, and apply engine oil to
them.
2. Using a small end bushig replacing tool, press in a new bushing
(service parts) taking due care to see that the connecting rod hole
matches the bushing hole.
[Servicing parts dimension]
W1066057
Piston pin bore I.D.
Factory spec.
20.000 to 20.013 mm
0.78740 to 0.78791 in.
Allowable limit
20.05 mm
0.7894 in.
Oil clearance between
piston pin and small end
bushing
Factory spec.
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 spec.
20.002 to 20.011 mm
0.78748 to 0.78783 in.
Small end bushing I.D. Factory spec.
20.025 to 20.040 mm
0.78839 to 0.78897 in.
Oil clearance between
piston pin and small end
bushing (Spare parts)
Factory spec.
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.
(Spare parts)
Factory spec.
20.026 to 20.077 mm
0.78843 to 0.79043 in.
(1) Seam
(2) Oil Hole
(A) When Removing
(B) When Installing
(C) 0.785 rad (45 °)
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