wsm wg972-e4 - Page 142

ENGINE
WG972-E4, WSM
1-S51
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.
9Y1211108ENS0089US0
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.
9Y1211108ENS0090US0
Clearance between
piston ring and piston
ring groove
Top ring
Factory
specifica-
tion
0.080 to 0.12 mm
0.0032 to 0.0047 in.
Allowable
limit
0.15 mm
0.0059 in.
Second
ring
Factory
specifica-
tion
0.065 to 0.10 mm
0.0026 to 0.0039 in.
Allowable
limit
0.15 mm
0.0059 in.
Oil ring
Factory
specifica-
tion
0.060 to 0.15 mm
0.0024 to 0.0059 in.
Allowable
limit
0.20 mm
0.0079 in.
Space between gauge
pin face plate
Allowable limit
0.05 mm
0.002 in.
KiSC issued 07, 2015 A