1-S66
MX5100, WSM
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.
W1031817
Oil Clearance between Piston 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.
W1031982
Replacing Connecting Rod Small End Bushing
(When removing)
1. Press out the used small end bushing using a small end bushing
replacing tool. (See page “SPECIAL TOOLS”.)
(When installing)
1. Clean a new small end bushing and bore, and apply engine oil to
them.
2. Using a small end bushing replacing tool, press in a new bushing
taking due care to see that the connecting rod oil hole matches
the bushing hole.
W1032140
Piston pin bore I.D.
Factory spec.
25.000 to 25.013 mm
0.98426 to 0.98476 in.
Allowable limit
25.05 mm
0.9862 in.
Oil clearance between
piston pin and small end
bushing
Factory spec.
0.014 to 0.036 mm
0.00056 to 0.0014 in.
Allowable limit
0.15 mm
0.0059 in.
Piston pin O.D. Factory spec.
25.004 to 25.011 mm
0.98441 to 0.98468 in.
Small end bushing I.D. Factory spec.
25.025 to 25.040 mm
0.98524 to 0.98582 in.
(A) When removing (B) When installing
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