Group
2J
Reconditioning
engine
Cyfinder head, cfeaning, inspection
25
mm
(0.
98
in)
42
(. ,
,
04mnl
(0.16
in)
131
.... 5
E10
Scrapping
sodium·filled
exhaust
valves
Caution;
Sodlum
in
contactwith
water
is explosive. Conse-
quently
when
drilling,
cutting
or
performing
any
form
of
work
which involves separating
sodium,
ensure the
sodium
does
not
come in contact
with
water,
1,
Drill a hote (4.0
mm
or 0.
16
In)
In
the valva Clown as
illustrated.
2.
Drill a hole (4.0 mm
or
0.16 in) in Ihe valve stem,
or
cul
lhe slem approximately
25
mm (0.98 in) from the end.
3.
Throw
the
valve inlo a buckel
of
waler. A powerful reac-
tion
of
an explosive nature will occur and you are advised
to stand at
least3
meters (10 feet) from the bucket. The
reaclion lasts
1-2
minules and afterwards the valve
can
be
mixed with ordinary scrap melal.
Check valve
guides
for
wear
El1
Checkwearwith
a diat
indicator
mounted
on
a
magnetic
stand.
Use new valves
and
press valves up
1-2
mm (0.04-0.08
in)
with finger.
Clearance,
"Vith
new
valve and new
Inlet Exhaust
guide
...........
mm
0.030-0.060 0.060-0.090
(In) (0.0012-0.0024) (0.0024-0.0035)
Max. clearance
measured with new
valve and
old
guide
...........
mm
0.15
(in) (0.0059)
Replacing valve
guides
Operations
E12-16
Press valve
guide
out
0.15
(0.0059)
Heat
cylinder
head
to
100±
100C
(212°±1SOF).
Drive
guide
out
with
drift
5218.
E12
Check
that
guide
has
not
damaged
bore
during
re-
moval.
If so,
valve
guide
bore
must
be
rea
med
to
oversize.
1
1
,
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