DAELIM HISTORY 125 - SERVICE, Service Manual

Page: 111 / 208

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
Comperssion 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
· ·· ·· ·· ·· ·· ·· ·· ·· ·
10-2
PISTON / PISTON RING
· ·· ·
10-3
CYLINDER INSTALLATION
· ·
10-5
ITEM STANDARD VALUE SERVICE LIMIT
Unit : mm
56.100 mm
0.050 mm
0.005 mm
0.020 mm
58.825 mm
15.040 mm
14.960 mm
0.020 mm
0.110 mm
0.080 mm
0.50 mm
1.10 mm
0.200 mm
15.060 mm
0.040 mm
56.000-56.010 mm
-
-
-
55.925-55.945 mm
15.002-15.008 mm
14.994-15.000 mm
0.002-0.014 mm
0.040-0.067 mm
0.025-0.052 mm
0.10-0.25 mm
0.20-0.70 mm
0.055-0.090 mm
15.010-15.028 mm
0.010-0.034 mm
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