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CYLINDER
HEAD/VALUES
TORQUE
VALVES
Valve
adjuster
lock
nut
Cylinder
head/camshaft
holder nut
Cylinder
head
bolt
Cam
sprocket
bolt
Cylinder
head
cover
bolt
TOOLS
10
N-m
(1.0 kgf-m.
7
lbf-ft)
23
N-m
(2.3
kgf-m. 17
lbf-ft)
12
N-m
(1.2
kgf-m.
9
lbf-ft)
20
N-m
(2.0
kgf-m, 14
lbf-ft)
Apply
a
locking
agent
to
the threads
10
N-m
(1.0
kgf-m.
7
lbf-ft)
Timing cap
wrench
Valve guide
driver, 5.5
mm
Valve guide reamer.
5.485
mm
Valve
spring
compressor
Valve
seat cutters
Seat
cutter.
24.5
mm
(45''
IN/EX)
Flat cutter.
25
mm
(32° IN)
Flat cutter.
25
mm
<32=
EX)
Interior cutter,
26
mm
(60'
IN/EX)
Cutter holder,
5.5
mm
07709
-
0010001
07742-0010100
07984
-
0980000
or
07984
-
098000D
(U.S.A. only)
07757 - 0010000
—
these
are
commercially
available
in
U.S.A.
07780-0010100
07780
-
0012000
07780-0012601
07780
-
0014500
07781
-
0010101
TROUBLESHOOTING
•
Engine
top-end
problems
usually
affect
engine performance.
These problem can be diagnosed by
a
compression
test
or
by
tracing
engine
noises
to the
top-end with a
sounding
rod stothoscope.
•
If
the
performance
is
poor
at
low
speeds, check
for
white
smoke
in
the
crankcase breather
tube.
If
the
tube
is
smoky,
chock
for
a
soized piston ring (Section
8).
Low
compression
•
Valves:
—
Incorrect valve
adjustment
—
Burned
or bent
valve
—
Incorrect valve
timing
—
Weak
valve spring
•
Cylinder hoad:
—
Leaking
or
damaged
head
gasket
—
Warped
or
cracked
cylinder
head
•
Worn
cylinder,
piston
or
piston rings (section
8)
High
compression
•
Excessive
carbon
build-up
on
piston
crown
or
on
combustion
chamber
Excessive
smoke
•
Worn
valve
stem
or valve
guide
•
Damaged
stem
seal
•
Worn
cylinder,
piston or piston
rings (section
8)
Excessive noise
•
Incorrect
valve
adjustment
•
Sticking
valve
or
broken
valve
spring
•
Worn
rocker
arm
and/or
shaft
Rough
idle
•
Low
cylinder
compression
•
Intake
air
leak
Overheating
•
Excessive
carbon
build-up
on
the piston
head
or
combustion
chamber
Knocking
or
abnormal
noise
•
Excessive
carbon
build-up
•
Worn
piston
and
cylinder
(section
8)
7-2
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