Cylinder Head/Valves Service Information; Cylinder Head/Valves Specifications - Honda 1985 CBX750F Workshop Manual

HONDA
CBX7S0F
6. CYLINDER
HEAD/VALVES~
SERVICE INFORMATION
6-1
TROUBLESHOOTING
6-2
CAMSHAFT REMOVAL 6-3
HYDRAULIC TAPPET REMOVAL 6-7
CYLINDER HEAD REMOVAL 6-8
CYLINDER HEAD DISASSEMBLY 6-11
VALVE GUIDE REPLACEMENT 6-13
VALVE SEAT INSPECTION/REFACING 6-14
CYLINDER H EAD ASSEMBLY
6-15
CYLINDER HEAD INSTALLATION
6-16
HYDRAULIC TAPPET INSTALLATION 6-18
CAMSHAFT INSTALLATION" 6-19
SERVICE INFORMATION
GENERAL
• The engine useshydraulic valve tappets that eliminate manual valve adjustments.
• The hydraulic tappets have de-foaming chambers. Before assembling. fill the chambers with clean engine oil.
• Do not turn the camshaft before installing camshaft holders and filling the de-foaming chambers with engine oil, when voi,
adjust the valve timing.
• Whenever the camshaft is removed. bleed air from the tappets thoroughly (See page 6·18).
• Lubricate the camshaft journals and cam lobes with molybdenum disulfied grease for initial lubrication .
• The camshaft holders are identified by the respective markings (IN R: intake right, IN L: intake left. EX R: exhaust right,
EX L: exhaust left).
SPECIFICATIONS
ITEM STANDARD
SERVICE LIMIT
Compression pressure 1,200 ± 200 kPa (12.0 ± 2.0 kg/cm
2 •
-
171 ± 28 psi)
Camshaft Cam height IN. EX 32.829-33.069 mm (1.2925-1.3019 in)
32.75 mm (1.289 in)
Oil clearance IN1.IN4. EX1, EX4 0.020-0.062 mm (0.0008-0.0024 in)
0.09 mm (0.004 in)
IN2.IN3. EX2, EX4 0.055-0.097 mm (0.0022-0.0038 in)
0.12 mm (0.005 in)
Runout
IN, EX
-
0.10 mm (0 .004 in)
Valve spring Free length IN. EX Outer 41.7 mm (1.64 in)
40.2 mm (1.58 in)
IN. EX Inner 36.83 mm (1.45 in) 35.5 mm (1.40 in)
Preload/length IN. EX Outer 29.5-33.5 kg/24 .9 mm
-
(65.0-73.9 Ib/0.980 in)
IN. EX Inner 12.5-14.5 kg/21.1 mm
-
(27.6-32.0Ib/0.831 in)
Valve. Valve Valve stem 0.0. IN 4.975-4.990 mm (0.1959-0.1965 in)
4.97 mm (0.195 in)
guide
EX 4.955-4.970 mm (0.1951-0.1957 in)
4.94 mm (0 .194 in)
Valve guide
1.0.
IN. EX
5.0-5.012 mm (0.1969-0.1973 in)
5.04 mm (0.198 in)
Stem-to-guide
IN
0.010-0.037 mm (0.0004-0.015 in) 0.07 mm (0.003 in)
clearance
EX 0.030-0.057 mm (0.0012-0.0022 in) 0.09 mm (0.004 in)
Cylinder head Warpage
-
0.10 mm (0.004 in)
Valve seat width IN. EX 0.9-1.1 mm (0.035-0.043 in)
1.5 mm (0.06 in)
6-1