Honda 2006 TRX680FA Service Manual page 205

CYLINDER HEADIVALVE/CAMSHAFT
SERVICE INFORMATION
GENERAL
• This section covers service of the rocker arms, cylinder head, valves and camshaft. These services can be done with the
engine installed in the frame.
• When disassembling, mark and store the disassembled parts to ensure that they are reinstalled in their originalloca-
tions.
• Clean all disassembled parts with cleaning solvent and dry them by blowing them off with compressed air before
inspection .
.. Rocker arm, valve and camshaft lubricating oil is fed through oil passages in the cylinder head and head cover. Clean
the oil passages before assembling cylinder head and head cover.
• Be careful not to damage the mating surfaces when removing the cylinder head cover and cylinder head.
SPECIFICATIONS
Unit· mm (in)
ITEM
-
STANDARD SERVICE LIMIT
Cylinder compression at 350 rpm {mln'}
550 kPa (5.6 kgt/cm ,80 psi)
Valve clearance IN 0.15 (0,0061
EX
0.33 (0,013)
Valve,
Valve stem O.D. IN
5,475 5.490 (0,2156
0.2161l
5.45 (0.215)
valve guide
EX
5.455 5,470 (0.2148 0.2154) 5.43 (0.214)
Valve guide I.D. IN/EX 5.500 - 5.512 (0.2165 0.2170) 5.53 (0.218)
Stem-to-guide clearance
IN---
0.010 ":'-0:037 (0.0004 ':::"0.0015-)_ .. 0.12 [0."005-)--
-Valve guide
projectio~
EX
0.030 0.057 (0.0012 0,0022)
0.14 (0,006)
-
~-
,
14.8 15.2 (0.58 0.60)
above cylinder head
EX
17.3 - 17.7 (0.68 0.70)
Valve seat width IN/EX
1.0 1:1 (0.039 - 0.043) 1.4 (0.06)
Valve spring Free length Inner 37.20 (1.465) 36.3 (1.43)
Outer
L
44.2011.740)
-
43.1 (1.70)
Rocker arm Arm I.D.
-
IN/EX
'-'2.000 - 12.018(0.4724":' 0.4731) f-----12,0510A74)
Shaft
o.o,
IN/EX
11.964 11.984 (0.4710 0.4718) 11.92 (0.469)
Arm-to
shaft clearance
IN/EX
0.Q16 0.054 (0.0006 0.OO21)
0.08 W.003)
Camshaft and Cam lobe height IN 35.015 35.175 (1.3785 1.3848)
34.840 (1.3717)
cam follower
EX
,
35.394 35.554 (1.3935 -1.3998) 35.144 (1.3824)
Cam follower
0.0.
IN/EX
22.467 22.482 (0.8845 0.8851) 22.461O.884)
Follower bore
1.0.
INIEX 22.510 22.526 (0.8862 0.8868)
22.54 (0.887)
-Follower-ta-bore clear-
-
IN/EX
fQ028 - 0.059{O.0011 - 0.0023)
-
0.07 W.o63j"
ance
L...2!linder head warpage
0.05 (0.002)
.
TOROUE VALUE
Cylinder head cover cap nut
Upper engine hanger bolt
Upper engine hanger bracket bolt
ECT sensor
55
Nm (5.6
kqf-rn, 41 lbf-tt]
54 Nm (5.5 kgf·m, 40 Ibf·ft)
32 Nm (3.3 kqf-m, 24Ibf·ft)
12 N·m (l2 kqf-rn, 9Ibf.ft)
Apply engine oil
9-3