Cylinder / Piston; Cylinder Installation; Cylinder Removal - DAELIM VJF125 Service Manual

11. CYLINDER / PISTON

SERVICE INFORMATION
TROUBLESHOOTING

CYLINDER REMOVAL

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.
SPECIFICATIONS
INNER DIAMETER
CYLINDERICAL
CYLINDER
ROUNDLESS
HEAD CONTACT WARPAGE
PISTON SKIRT OUTER DIAMETER
PISTON PIN HOLE INNER DIAMETER
PISTON PIN OUTER DIAMETER
PISTON,
PISTON-TO-PISTON PIN CLEARANCE
PISTON PIN,
PISTON RING-TO-
PISTON RING
GROOVE CLEARANCE
PISTON RING
JOINT GAP
CYLINDER-TO-PISTON CLEARANCE
CONNECTING ROD SMALL END INNER DIAMETER
GAP BETWEEN CONNECTING ROD SMALL END AND PISTON PIN
TROUBLESHOOTING
Compression too low
Worn piston
Worn, damaged piston ring
Worn cylinder
Excessive smoke
Worn cylinder, piston or piston rings
Improper installation of piston ring
Scored or scratched piston or cylinder
11-1
11-1
11-2
ITEM
TOP
SECOND
TOP / SECOND
OIL RING (SIDE RAIL)
PISTON / PISTON RING

CYLINDER INSTALLATION

STANDARD VALUE
73.005~73.015
-
-
-
72.985~72.965
17.002~17.008
16.994~17.000
0.002~0.014
0.015~0.045
0.015~0.045
0.35~0.45
0.20~0.70
0.020~0.050
17.010~17.028
0.010~0.034
Overheating
Excessive carbon build-up on top of piston
Abnormal noise
Worn cylinder and piston
Worn connecting rod small end bearing or piston pin
Damaged piston ring
Excessive carbon build-up on top of piston
11-3
11-6
Unit : mm
SERVICE LIMIT
73.10
0.10
0.05
0.10
72.60
17.04
16.96
0.02
0.09
0.09
0.50
1.10
0.30
17.06
0.04
11-1