'
FIG. A.l/4 REMOVING CYLINDER HEAD FROM
ENGINE INSTALLED ON ENGINE STAND
The
instructions
for
removing the
cylinder
head
from an engine removed from the tractor are
similar
to
the ones given previously
for
the trac·
tor
installed engine, provided
of
course that in
the former case the engine
unit
will
have
to
be
installed on the shop turnover stand. (See Fig.
A.l/4).
CHECKING THE CYLINDER HEAD
For complete inspection and checking
of
the
cylinder head,
it
is best
to
remove valves, valve
springs and nozzles and
to
clean the mating sur·
face, valve seat and passages.
Check the
cylinder
head mating plane by moving
it
over a surface plate smeared with lampblack
or
blue.
If
high spots show up, reface it.
If
valve seats are
to
be re·cut, the
cylinder
head
mating
plane can be ground
to
a depth not ex-
ceeding 0.020 in. (0.5 mm.).
In case
of
grinding, we suggest that a copper
washer
of
suitable
thickness
be placed inside
the nozzle seat
so
to
maintain the nozzle projec-
tion
above the
cylinder
head at the same value as
before; also, make sure the valve recessing from
the cylinder head plane does not exceed 0.03-
0.04 in.
(0.7
•
1.1
mm.) (Fig. A.l/5). The
height
of
a
new
cylinder
head is 3.662 in. (92 mm.).
Check the expansion
cups
and threaded plug
for
coolant
and
oil
tightness
and replace them
if
necessary.
Following
checks, Inspections, grinding, wash
cylinder
head
in
solvent
to
remGve even the
slightest
trace
of
abrasive matter.
15129
FIG. A.l/5 MEASURING NOZZLE PROJECTION
ABOVE CYLINDER HEAD PLANE
(a) AND VALVE
RECESSING (b)
Nozzle projection: 0.08 • 0.10 in.
(2
•
2.5
mm.)
Valve recessing: 0.03 • 0.04 in.
(0.7
·
1.1
mm.)
15130
FIG. •A.I/6 DIMENSIONS
OF
lNTAKE AND EX·
HAUST VALVE SEATS AND OF VALVE GUIDES
IN CYLINDER HEAD
X = 13.966 mm. · .549 in.
13.983 mm. • .550 in.
(A) Intake
Valves
mm.
ln.
Dia. D
40
1.575
Dia. E
48.6 1.913
(s) Exhaust
mm.
ln.
33
1.299
41.6 1.638
Engine·
13
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