Cylinder Head/Valves - Honda 1998 VT750C Service Manual

10. CYLINDER HEAD/VALVES
SERVICE INFORMATION 10-1 VALVE GUIDE REPLACEMENT
10-18
TROUBLESHOOTING 10-3
VALVE SEAT INSPECTION!
CYLINDER COMPRESSION 10-4
REFACING 10-20
CYLINDER HEAD ASSEMBLY
10-22
CYLINDER HEAD COVER REMOVAL 10-5
CYLINDER HEAD INSTALLATION
10-24
CAMSHAFT REMOVAL 10-8
CAMSHAFT INSTALLATION
10-26
CYLINDER HEAD REMOVAL 10-14
CYLINDER HEAD COVER
CYLINDER HEAD DISASSEMBLY 10-15
INSTALLATION
10-32
SERVICE INFORMATION
GENERAL
• The engine must be removed from the frame before servicing the rear cylinder head.
• The front and rear cylinder head cover and front cylinder head can be serviced with the engine in the frame.
• The camshaft can be serviced with the engine in the frame.
~
• Be careful not to damage the mating surface when removing the cylinder head cover and cylinder head.
-..:.I
• When disassembling, mark and store the disassembled parts to ensure that they are reinstalled in their original locations.
• Clean all disassembled parts with clean solvent and dry them using compressed air before inspection.
• During assembly apply molybdenum disulfide oil to the camshaft holders, camshaft journals of the cylinder head, rock-
er arm shafts, rocker arm slipper faces and valve stems to provide initial lubrication.
SPECIFICATIONS
Unit: mm (in)
ITEM STANDARD SERVICE LIMIT
Cylinder compression
1,275
±
98 kPa (13.0
±
1.0 kgf/cm
2
,
- -
185
±
14 psi) at 400 rpm
Cylinder head warpage
- -
0.10 (0.004)
Valve, Valve clearance IN 0.13 - 0.17 (0.005 - 0.007)
- -
valve guide
EX
0.18 - 0.22 (0.007 - 0.009)
- -
Valve stem 0.0.
IN
5.475 - 5.490 (0.2156 - 0.2161) 5.45 (0.215)
EX
6.555 - 6.570 (0.2580 - 0.2587) 6.55 (0.258)
Valve guide 1.0.
IN
5.500 - 5.512 (0.2165 - 0.2170) 5.56 (0.219)
EX
6.600 - 6.615 (0.2598 - 0.2604) 6.65 (0.262)
Stem-to-guide clearance
IN
0.010 - 0.037 (0.0004 - 0.0015)
0.10 (0.004)
EX
0.030 - 0.060 (0.0012 - 0.0024) 0.11 (O.004)
Valve guide projection above IN
19.5 (0.77)
- -
cylinder head
EX
18.0 (0.71) - -
Valve seat width
IN/EX
0.90- 1.10 (0.035 - 0.043) 1.5 (0.06)
Valve spring free length
IN
42.14 (1.659) 40.58 (1.598)
EX
42.83 (1.686)
41.25 (1.624)
10-1