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SERVlClNG ENGINE 3-22
CYLINDER HEAD DISTORTION
Decarbonize the combustion chambers.
Check the gasketed
surface of the
cylinder head
,
.nJRL
<-----
. -
far distortion
with
a straightedge and thickness
h ,
uLi,
gauge,
raking a clearance reading
at
several
places indicated, If the largest reading at any
' s . ,
position of the straightedge exceeds the
limit,
q
. I
L
m
,
replace the cylinder head.
-
. I
L
1 1 1
-
3
09900 - 20803
VALVE HEAD THICKNESS
Visually
inspect
each valve for wear
of its
seating
face. Replace any valve
with an abnor-
mally worn
face.
@
The thickness
decreasesaszhe wear of the
face advances. Measure the
thickness and, if the
thickness is found to
have
been reduced to the
limit, replace it.
Thickness
gauge
Service Limit
0 . 2
mrn
(0.008
in}
VALVE STEM RUNOUT
Support
the valve with "V" blocks, as shown,
and check its runout with
a
dial gauge.
The
valve must be replaced if the runout exceeds
the limit.
Service Limit
0.5 rnm
(0.02
in)
Service Limit
'
0.05
mrn
(0,002
in)
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