2. Piston Ring-to-Groove Clearance Inspection
(I ) Measure the piston ring-to-groove clearan
ce. If the clearance exceeds the service limit,
replace the ring with a new one and re-.check
the clearance.
(2) If the clearance still exceeds the service limit,
replace the piston with a new one.
Piston ring-to-groove clearance
Description
Standard value
Service limit
No.I
0,06
0,3
No.2
0,07
0,2
Oil ring
0,05
0,2
3. Connecting Rod Big End Bearing Inspection
Install the big end bearings and cap to the connect
ing rod, tighten the rod cap to the specified torque
and measure the bearing I. D.
Caution
• Oil clearance between the big end bearing and the
crankpin can be measured with a plastic gauge.
• If the oil clearance does not fall within the service
limit with new bearings, refer to the crankshaft
chapter and use undersize bearings.
•
Measuring Piston Ring-to-Groove Clearance
Taperring clearance
Plan ring clearance
Measuring Semi-keystone Piston Ring-to-Groove Clearance
Measuring Rod Big End Bearing I. D.
Description
Standard value Service limit
Rod big end
42
+o. 15
bearing I.
D.
(Standard)
+0.15
Rod big end
0.025"-'0,080
o. 15
bearing oil
o.
15
clearance
Cap nut
tightening
torque (kgm)
3.2 - 3.5
-57-
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