DAELIM BESBI SC125 - Service Manual - 10. Cylinder / Piston
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
TROUBLE SHOOTING
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
SERVICE INFORMATION
10-1
TROUBLE SHOOTING
10-1
CYLINDER
10-2
PISTON / PISTON RING
10-3
CYLINDER INSTALLATION
10-6
ITEM
STANDARD VALUE
SERVICE LIMIT
Unit : mm
52.500 mm
0.050 mm
0.005 mm
0.05 mm
52.30 mm
15.040 mm
14.960 mm
0.105 mm
0.095 mm
0.050 mm
0.50 mm
-
0.105 mm
15.037 mm
0.020 mm
52.400-52.410 mm
-
-
-
52.370-52.390 mm
15.002-15.008 mm
14.996-15.000 mm
0.002-0.014 mm
0.03-0.07 mm
0.02-0.06 mm
0.15-0.30 mm
0.20-0.70 mm
0.015-0.045 mm
15.002-15.013 mm
0.002-0.014 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