Operation Manual

BX25, RCK54(P)-23BX, RCK60B-23BX, LA240, BT601, WSM
ENGINE
3TMABABOP056A
Connecting Rod Alignment
• NOTE
• Since checking of 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
0.05mm
Allowable limit
alignment
0.0020 in.
~
3EEABAB 1 P 144A
W10314620
Piston Ring Gap
1. Insert the piston ring into the lower part of the cylinder (the least
worn out part) with a piston ring compressor and piston.
2. Measure the ring gap with a feeler gauge.
3. If the measurement exceeds the allowable limit, replace the
piston ring.
Factory 0.20 to 0.35 mm
Top ring
spec.
0.0079 to 0.0138 in.
Allowable 1.25 mm
limit
0.0492 in.
Factory
0.35 to 0.50 mm
Piston ring gap Second ring
spec. 0.0138 to 0.0197 in.
Allowable 1.25 mm
limit 0.0492 in.
Oil ring
Factory
spec.
0.20 to
0.35 mm
0.0079
to 0.0138 in.
Allowable 1.25 mm
limit
0.0492 in.
3TMABAB1 P072A
W11466710
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.
3. If the clearance exceeds the allowable limit, replace the piston
ring.
4. If the clearance still exceeds the allowable limit after replacing the
ring, replace the piston.
Clearance between
Second ring
Factory
spec.
0.090
to 0.120 mm
0.00354 to 0.00472 in.
Allowable
limit
0.15 mm
0.0059 in.
piston ring and
piston ring groove
Oil ring
Factory
spec.
0.04 to 0.08 mm
0.0016 to 0.0031 in.
Allowable
0.15 mm
limit
0.0059
in.
W11485500
1-851