1-S47
F2880, F3680, RCK72-F36, RCK72R-F36, RCK60-F36, RCK60R-F36, WSM
ENGINE
Connecting Rod Alignment
â–
• Since the I.D. of the connecting rod small end bushing is the
basis of this check, check bushing for wear beforehand.
1. Install the piston pin into the connecting rod.
2. Install the connecting rod on the connecting rod alignment tool.
3. Put a gauge over the piston pin, and move it against the face
plate.
4. If the gauge does not fit squarely against the face plate, measure
the space between the pin of the gauge and the face plate.
5. If the measurement exceeds the allowable limit, replace the
connecting rod.
W10314620
Piston Ring Gap
1. Insert the piston ring into the lower part of the cylinder (the least
worn out part) with a piston.
2. Measure the ring gap with a thickness gauge.
3. If the measurement exceeds the allowable limit, replace the
piston ring.
W10310120
Clearance between Piston ring and Piston Ring Groove
1. Clean the rings and the ring grooves, and install each ring in its
groove.
2. Measure the clearance between the ring and the groove with a
feeler gauge or depth gauge.
3. If the clearance exceeds the allowable limit, replace the piston
ring.
4. If the clearance still exceeds the allowable limit with new ring,
replace the piston.
W10312390
Connecting rod
alignment
Allowable limit
0.05 mm
0.0020 in.
Piston ring gap
Top ring
Factory
spec.
0.30 to 0.45 mm
0.0118 to 0.0177 in.
Allowable
limit
1.25 mm
0.0492 in.
Second ring
Factory
spec.
0.30 to 0.45 mm
0.0118 to 0.0177 in.
Allowable
limit
1.25 mm
0.0492 in.
Oil ring
Factory
spec.
0.25 to 0.40 mm
0.0098 to 0.0157 in.
Allowable
limit
1.25 mm
0.0492 in.
Clearance between
piston ring and piston
ring groove
Second
ring
Factory
spec.
0.085 to 0.112 mm
0.0033 to 0.0044 in.
Allowable
limit
0.20 mm
0.0079 in.
Oil ring
Factory
spec.
0.020 to 0.055 mm
0.0008 to 0.0021 in.
Allowable
limit
0.15 mm
0.0059 in.
Factory specification : a
More than 0.2 mm
0.0079 in.
(A) Top Ring (Key Stone Type) (B) 2nd, Oil Ring
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