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B05997-
10
19.4.24
C
hecking
the
cylinder head
R034 14-J0
005039-
10
302808-
10
-
Mount
screw
plugs
O
with new 0-rings.
Guideli
ne
Screw plug,
cam
lever axis
MlOxl
10
Nm
(7.4 lbf ft)
-
Check
valve
guides
O
using
the special
tool.
I
Limit
plug
gauge
(77029026000)
(1-:;i
p. 479)
»
If
the
special
tool is easy to insert into
the valve guide:
-
Change
the valve
guide and
valve.
-
Check the sealing area of the spark
plug
thread and the
valve
seats for damage and
tearing.
•
If there is damage
or
cracking:
-
Change
the
cylinder head.
-
Check the sealing area of the cylinder for d istortion using a
straight
edge
and
the special
tool.
I
Feeler gauge (59029041100)
(
p. 471)
Cyl inder/cylinder head
-
seal-
:;; 0 .05 mm(:, 0.002 in)
i
ng
area
d
istortion
•
If
the measured
value
does not
meet
specifications:
-
Change the cylinder
head.
-
Check sealing seat
f)
of the
valves.
Valve
- sealing
seat widt
h
Intake
I
2.80 mm
(0.1102
in)
Valve
- sealing
seat
width
Exhaust
3
.00
mm
(0.1181
in)
•
If
the measured
value
does not meet specifications:
-
Machine
the
valve
seat.
-
Blow
compressed air
t
hrough
all
oi
l
channels and oil
nozzles,
and check that they are clear.
-
Check
valve
@
for damage
and
wear.
»
If
there is damage
or wear:
-
Change
the valve.
-
Check the
valve
for run -out.
Valve
- run-out
On the
valve plate
I
:;;
0.05 mm(:;; 0.002 in)
On the
valve
stem
I
:;;
0.05
mm(:;;
0.002
in)
»
If
the
measured value does
not
meet specifications:
-
Change
the valve.
ENGINE 19
307
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