S-59
WG972-E2, DF972-E2, WSM
GASOLINE / LPG ENGINE
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.
W1146671
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
thickness 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.
W1148550
Connecting Rod Alignment
1. Remove the crankpin bearing, and install the connecting rod cap.
2. Install the piston pin in the connecting rod.
3. Install the connecting rod on the connecting rod alignment tool.
4. Put a gauge over the piston pin, and move it against the face
plate.
5. If the gauge does not fit squarely against the face plate, measure
the space between the pin of the gauge and the face plate.
6. If the measurement exceeds the allowable limit, replace the
connecting rod.
W1031462
Piston ring gap
Top ring
Factory
spec.
0.15 to 0.35 mm
0.0059 to 0.0138 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.
0.20 to 0.70 mm
0.0079 to 0.0276 in.
Allowable
limit
1.25 mm
0.0492 in.
Clearance between
piston ring and
piston ring groove
Top ring
Second ring
Factory
spec.
0.080 to 0.120 mm
0.00315 to 0.00472 in.
Allowable
limit
0.15 mm
0.0059 in.
Oil ring
Factory
spec.
0.065 to 0.10 mm
0.0026 to 0.0039 in.
Allowable
limit
0.15 mm
0.0059 in.
Space between gauge
pin face plate
Allowable limit
0.05 mm
0.0020 in.
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