DAELIM ROADWIN VJ125 - Cylinder;Piston Service Information; Cylinder;Piston Specifications; Cylinder;Piston Troubleshooting

10-1
10. CYLINDER / PISTON
SERVICE INFORMATION
GENERAL SAFETY
● Be careful not to damage the mating surfaces by using a screwdriver when disassembling the cylinder. Do not strike the
cylinder too hard during disassembly, even with a rubber or plastic mallet, to prevent the possibility of damage to the
cylinder fins.
● Take care not to damage the cylinder wall and piston.
● Check parts after disassembling, and clean and dry with an air hose prior to taking measurements.
SPECIFICATIONS
TROUBLESHOOTING
Compression too low Overheating
● Worn piston ● Excessive carbon build-up on top of piston
● Worn, damaged piston ring
● Worn cylinder
Abnormal noise
Excessive smoke ● Worn cylinder and piston
● Worn cylinder, piston or piston rings ● Worn connecting rod small end bearing or piston pin
● Improper installation of piston ring ● Damaged piston ring
● Scored or scratched piston or cylinder wall ● Excessive carbon build-up on top of piston
10
SERVICE INFORMATION
······
10-1
TROUBLESHOOTING
········
10-1
CYLINDER REMOVAL
········
10-2
PISTON / PISTON RING
····
10-3
CYLINDER INSTALLATION
··
10-6
ITEM STANDARD VALUE SERVICE LIMIT
Unit : mm
56.600
0.050
0.100
0.100
56.370
15.040
14.960
0.020
0.090
0.090
0.500
1.100
0.150
15.060
0.040
56.500~56.510
-
-
-
56.470~56.490
15.002~15.008
14.994~15.000
0.002~0.014
0.015~0.045
0.015~0.045
0.10~0.25
0.20~0.70
0.010~0.040
15.010~15.028
0.010~0.034
INNER DIAMETER
TAPER
OUT-OF-ROUND
HEAD CONTACT WARPAGE
PISTON SKIRT OUTER DIAMETER
PISTON PIN HOLE INNER DIAMETER
PISTON PIN OUTER DIAMETER
PISTON-TO-PISTON PIN CLEARANCE
CYLINDER
PISTON RING-TO-
GROOVE CLEARANCE
PISTON RING
JOINT GAP
TOP
SECOND
TOP / SECOND
OIL RING (SIDE RAIL)
PISTON,
PISTON PIN,
PISTON RING
CYLINDER-TO-PISTON CLEARANCE
CONNECTING ROD SMALL END INNER DIAMETER
GAP BETWEEN CONNECTING ROD SMALL END AND PISTON PIN