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Cylinder Head/valves - Honda rebel 250 Service Manual

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Table of Contents
7.
CYLINDER HEAD/VALVES
SERVICE
INFORMATION
7-1
VALVE GUIDE
REPLACEMENT
7-10
TROUBLESHOOTING
7-2
VALVE SEAT INSPECTION/REFACING
7-11
CYLINDER
COMPRESSION
TEST
7-3
CYLINDER
HEAD ASSEMBLY
7-14
ROCKER ARM/CAMSHAFT
REMOVAL
7-3
CYLINDER
HEAD
INSTALLATION
7-15
CYLINDER
HEAD
REMOVAL
7-7
CAMSHAFT/ROCKER
ARM
CYLINDER
HEAD DISASSEMBLY
7-8
INSTALLATION
7-16
CYLINDER
HEAD
INSPECTION
7-9
SERVICE
INFORMATION
GENERAL
This section covers service of the cylinder head,
valves, rocker
arms and
camshaft.
Rocker
arms and
camshaft can be
serviced
with
the
engine
installed
in
the frame.
The
engine
must be removed
for
servicing the cylinder
head
and
valves.
When
disassembling,
mark
and
store the
disassembled
parts
to
ensure
that
they
are
reinstalled
in their
original
locations.
Clean
all
disassembled
parts
with cleaning solvent
and
dry
them
by blowing
them
off
with
compressed
air
before
inspection.
Rocker
arm
lubricating
oil is
fed
through
oil
passages
in
the
cylinder
hoad. Clean the
oil
passages
before
assembling
cylinder
head and
rocker
arm
holder
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
Cylinder
head
warpage
1.100
kPa
(11.2
kg/cm
J
,
159
psi)
at
600
rpm
0.10
(0.004)
Valve
and
valve
guide
Valve
spring
tree length
Valve clearance
IN/EX
0.06
- 0.10(0.002
-
0.004)
VBlve
stem
O.D.
IN
EX
Valve guide
I.D.
IN
EX
Stem-to-guide clearance
IN
EX
Valve
seat
width
IN/EX
Inner
Outer
IN/EX
IN/EX
5.450 - 5.465 (0.2146 - 0.2152)
5.42
(0.213)
5.430 - 5.445 (0.2138
-
0.2144)
6.40
(0.213)
5.475 - 5.485 (0.2156
-
0.2159)
5.475 - 5.485
(0.2
1
56
-
0.2
169)
5.50
(0.217)
5.50
(0.217)
0.010 -
0
035
(0.0004
- 0.0014)
0.030
-
0.055 (0.0012
-
0.0022)
0.08
(0.003)
0.10
(0.004)
1.0-
1.1
(0.039
-
0.043)
29.9(1
38.2(1
18)
50)
1
8
'0.07'
29.0
(1.14)
37.0(1.46)
Rocker
arm
Camshaft
Rocker
arm
I.D.
IN/EX
10.000
-
10.015 (0.3937
-
0.3943)
10.10(0.398)
Rocker
arm
shaft
O.D.
IN/EX
9.972
-
9.987 (0.3926
-
0.3932)
9.91 (0.390)
Rocker
arm-to-shaft clearance
IN/EX
0.013 - 0.043 (0.0005 - 0.0017)
0.05
(0.002)
Cam
lobe height
Runout
IN
27.383
-
27.543
(1.0781
-
1.0844)
27.2(1.07)
EX
27.209
-
27.369 (1.0712 -
1.0775)
27.0(1.06)
0.05
(0.002)
Journal O.D.
19.967
-
19.980 (0,7861
-
0.7866)
Bushing
I.D.
20.063 - 20.083 (0.7899 - 0.7907)
19.92
(0.784)
20.20
(0.795)

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