KYMCO 2006 MXU 500 Off-Road, Owner'S Manual

Page: 345 / 677

8. CYLINDER HEAD/VALVES
8-2
MXU 500
SERVICE INFORMATION
GENERAL INSTRUCTIONS
x
The cylinder head can be serviced with the engine installed in the frame. Coolant in the radiator
and water jacket must be drained first.
x
When assembling, apply molybdenum disulfide grease or engine oil to the valve guide movable
parts and valve arm sliding surfaces for initial lubrication.
x
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.
x
After disassembly, clean the removed parts and dry them with compressed air before inspection.
x
After removal, mark and arrange the removed parts in order. When assembling, install them in
the reverse order of removal.
SPECIFICATIONS
Unit: mm (in)
Item Standard Service Limit
IN 0.1 mm (0.004 in)

Valve clearance (cold)
EX 0.1 mm (0.004 in)

Cylinder head compression pressure 15 kg/cm 2 (1500 kPa, 213 psi)

Cylinder head warpage

0.05 (0.002)
Camshaft runout

0.05 (0.002)
IN 37.2614 (1.4905) 37.11 (1.4844)
Camshaft cam height
EX 37.0084 (1.4803) 36.86 (1.4744)
IN 10 (0.4)
阡
10.015 (0.4006) 10.1 (0.404)
Valve rocker arm I.D.
EX 10 (0.4)
阡
10.015 (0.4006) 10.1 (0.404)
Valve rocker arm shaft IN 9.975 (0.399)
阡
9.99 (0.3996) 9.9 (0.396)
O.D. EX 9.975 (0.399)
阡
9.99 (0.3996) 9.9 (0.396)
Rocker arm to shaft clearance
0.009 (0.0004)
阡
0.042 (0.0017) 0.1 (0.004)
IN 4.975 (0.199)
阡
4.99 (0.1996) 4.925 (0.197)
Valve stem O.D.
EX 4.955 (0.1982)
阡
4.97 (0.1988) 4.915 (0.1966)
IN 5 (0.2)
阡
5.015 (0.2006) 5.03 (0.2012)
Valve guide I.D.
EX 5 (0.2)
阡
5.015 (0.2006) 5.03 (0.2012)
Valve stem-to-guide IN 0.01 (0.004)
阡
0.037 (0.0015) 0.08 (0.0032)
clearance EX 0.03 (0.0012)
阡
0.057 (0.0023) 0.1 (0.004)