Service Information; Specifications - KYMCO GRAND DINK 125 Service Manual

6
. CYLINDER HEAD/VALVES

SERVICE INFORMATION

GENERAL INSTRUCTIONS
• The cylinder head can be serviced with the engine installed in the frame. Coolant in the radiator
and water jacket must be drained first.
• When assembling, apply molybdenum disulfide grease or engine oil to the valve guide movable
parts and valve arm sliding surfaces for initial lubrication.
• The valve rocker arms are lubricated by engine oil through the cylinder head engine oil passages.
Clean and unclog the oil passages before assembling the cylinder head.
• After disassembly, clean the removed parts and dry them with compressed air before inspection.
• After removal, mark and arrange the removed parts in order. When assembling, install them in the
reverse order of removal.

SPECIFICATIONS

Item
Valve clearance (cold)
Cylinder head compression pressure
Cylinder head warpage
Camshaft cam height
Valve rocker arm I.D.
Valve rocker arm shaft
O.D.
Valve seat width
Valve stem O.D.
Valve guide I.D.
Valve stem-to-guide
clearance
TORQUE VALUES
Cylinder head cap nut
Valve clearance adjusting nut
Cylinder head cover bolt
SPECIAL TOOLS
Valve spring compressor
Valve seat cutter, 24.5mm
Valve seat cutter, 25mm
Valve seat cutter, 22mm
Valve seat cutter, 26mm
Cutter clip
Valve guide driver
Valve guide reamer
Standard (mm)
SH30DA
IN 0.10
EX 0.10
15kg/cm_
æ
IN 30.8763
EX 30.4081
IN 10.00 10.018 10.00
EX 10.00 10.018 10.00
IN 9.972 9.987 9.972
EX 9.972 9.987 9.972
IN 1.2
EX 1.2
IN 4.990 4.975 4.990
EX 4.970 4.955 4.970
IN 5.00 5.012
EX 5.00 5.012
IN 0.010 0.037 0.010
EX 0.030 0.057 0.030
19.6N-m
8.8N-m
7.8 11.8N-m
GRAND DINK 125/150
Service Limit (mm)
SH25DA SH30DA SH25DA
0.10
æ
0.10
æ
15kg/cm_
æ
0.05
æ
30.8763 30.75
30.4081 30.26
10.018 10.10
10.018 10.10
9.987 9.9
9.987 9.9
1.2 1.8
1.2 1.8
4.975 4.925
4.955 4.915
5.00 5.012 5.03
5.00 5.012 5.03
0.037 0.08
0.057 0.10
Apply engine oil to threads
Apply engine oil to threads
45° IN-EX
Plane cutter 37.5° EX
Plane cutter 37.5° EX
Plane cutter 63.5° IN/EX
æ
æ
0.05
30.75
30.26
10.10
10.10
9.9
9.9
1.8
1.8
4.925
4.915
5.03
5.03
0.08
0.10
6-2