Kubota WSM F2880 Workshop Manual page 113

F2880, F3680, RCK72-F36, RCK72R-F36, RCK60-F36, RCK60R-F36, WSM
Connecting Rod Alignment
NOTE
• 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.
Connecting rod
Allowable limit
alignment
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.
Top ring
Piston ring gap Second ring
Oil ring
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.
Second
ring
Clearance between
piston ring and piston
ring groove
Oil ring
Factory specification : a
(A) Top Ring (Key Stone Type)
1-S47
0.05 mm
0.0020 in.
W10314620
Factory 0.30 to 0.45 mm
spec. 0.0118 to 0.0177 in.
Allowable 1.25 mm
limit 0.0492 in.
Factory 0.30 to 0.45 mm
spec. 0.0118 to 0.0177 in.
Allowable 1.25 mm
limit 0.0492 in.
Factory 0.25 to 0.40 mm
spec. 0.0098 to 0.0157 in.
Allowable 1.25 mm
limit 0.0492 in.
W10310120
Factory 0.085 to 0.112 mm
spec. 0.0033 to 0.0044 in.
Allowable 0.20 mm
limit 0.0079 in.
Factory 0.020 to 0.055 mm
spec. 0.0008 to 0.0021 in.
Allowable 0.15 mm
limit 0.0059 in.
More than 0.2 mm
0.0079 in.
(B) 2nd, Oil Ring
W10312390
KiSC issued 04, 2006 A
ENGINE