Service Information; Torque Values - KYMCO GRAND DINK 250 Manual

6
. CYLINDER HEAD/VALVES

SERVICE INFORMATION

GENERAL INSTRUCTIONS
• The cylinder head can be serviced with the engine installed in the frame.
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.
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)
IN
EX
IN
EX
IN 10.00 10.015
EX 10.00 10.015
IN 9.972 9.987
EX 9.972 9.987
IN
EX
IN 4.990 4.975
EX 4.970 4.955
IN 5.00 5.012
EX 5.00 5.012
IN 0.010 0.037
EX 0.030 0.057
24.5N-m
8.8N-m
7.8 11.8N-m
When assembling, install them in
SH50DA
0.10
0.10
15kg/cm²
⎯
34.2987
34.1721
1.2
1.2
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
GRAND DINK 250
Coolant in the
Service Limit (mm)
SH50DA
⎯
⎯
⎯
0.05
34.14
34.02
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