Paragraphs 149-149A
149.
REMOVE
AND
REINSTALL.
Before loosening
any
lines, wash
the
nozzle holder
and
connections with
clean diesel fuel
or
kerosene. After
disconnecting
the
high pressure
and
leak-off lines, cover open ends
of
con-
nections with tape
or
composition caps
to prevent
the
entrance
of
dirt
or
other foreign material. Remove
the
nozzle holder
-
stud nuts
and
care-
fully withdraw
the
nozzle from cylin-
der head, being careful
not
to
strike
the
tip end
of
the
nozzle against
any
hard surface.
Thoroughly clean
the
nozzle recess
in
the
cylinder head before reinsert-
ing
the
nozzle
and
holder assembly.
It
is important that
the
seating surfaces
of recess
be
free
of
even
the
smallest
particle
of
carbon which could cause
the unit
to be
cocked
and
result
in
blowby
of hot
gases.
No
hard
or
sharp
tools should
be
used
for
cleaning.
A
piece
of
wood dowel
or
brass stock
properly shaped
is
very effective.
Do
not reuse
the
copper ring gasket (1—
Fig. AC62), always install
a
new one.
Tighten
the
nozzle holder stud nuts
to
a
torque
of
14-16
Ft.-Lbs.
149A. MINOR OVERHAUL
OF
NOZZLE VALVE
AND
BODY. Hard
or sharp tools, emery cloth, crocus
cloth, grinding compounds
or
abra-
sives
of
any
kind should NEVER
be
used
in the
cleaning
of
nozzles.
A noz-
zle cleaning
and
maintenance
kit is
available through
any
American
Bosch Service Agency under
the num-
ber
of
TSE
7779.
Wipe
all
dirt
and
loose carbon from
the nozzle
and
holder assembly with
a
clean, lint free cloth. Carefully clamp
nozzle holder assembly
in
a
soft jawed
vise
and
remove
the
nozzle holder
nut
and spray nozzle. Reinstall
the
holder
nut
to
protect
the
lapped
end
of the
holder body. Normally,
the
nozzle
valve (V—Fig. AC62A)
can
be
easily
withdrawn from the nozzle body.
If
the
valve cannot
be
easily withdrawn,
soak
the
assembly
in
fuel
oil,
acetone,
carbon tetrachloride
or
similar carbon
solvent
to
facilitate removal.
Be
care-
ful
not to
permit
the
valve
or
body
to come
in
contact with
any
hard
surface.
Clean
the
nozzle valve with mutton
tallow used
on a
soft, lint free cloth
or
pad. The
valve
may be
held
by its
stem
in a
revolving chuck during this
cleaning operation.
A
piece
of
soft
wood well soaked
in
oil
will
be
help-
ful
in
removing carbon deposits from
the valve.
The inside
of
the
nozzle body
(tip)
can
be
cleaned
by
forming
a
piece
of
soft wood
to a
point which will
cor-
respond
to the
angle
of the
nozzle
valve seat.
The
wood should
be
well
i
'
r 1.^ ^
1
II
''—LL
B
J9I
y
p
AUIS-CHALMERS
soaked
in
oil. The
orifice
of
the
tip
can
be
cleaned with
a
wood splinter.
The outer surfaces
of
the
nozzle body
should
be
cleaned with
a
brass wire
brush
and
a
soft, lint free cloth soaked
in
a
suitable carbon solvent.
Thoroughly wash
the
nozzle valve
and body
in
clean diesel fuel
and
clean
the
pintle
and its
seat
as fol-
lows:
Hold
the
valve
at
the
stem
end
only
and
using light
oil as
a
lubricant,
rotate
the
valve back
and
forth
in
the
body. Some time
may be
required
in
removing
the
particles
of
dirt from
the pintle valve; however, abrasive
materials should never
be
used
in
the
cleaning process.
Test
the
fit of
the
nozzle valve
in
the nozzle body
as
follows: Hold
the
body
at a 45
degree angle
and
start
the valve
in the
body.
The
valve
should slide slowly into
the
body
un-
der
its
own
weight. Note: Dirt
par-
ticles,
too
small
to be
seen
by the
naked
eye,
will restrict
the
valve
ac-
tion.
If the
valve sticks,
and it is
known
to
be
clean, free-up
the
valve
by working
the
valve
in the
body with
mutton tallow.
Before reassembling, thoroughly
rinse
all
parts
in
clean diesel fuel
and
make certain that
all
carbon
is re-
moved from
the
nozzle holder
nut.
Install nozzle body
and
holder
nut,
making certain that
the
valve stem
is
Fig.
AC62
—
Secfional view showing
the
iitiection noxzle installation. Whenever
the
nozzie
has
been removed, always renew
the
copper gasket
(1).
Fig.
AC62A
—
Removing injection nonle
/ ,
valve
(V)
from
tip (T). If the
valve
is Ji
difficult
to
remove, soak
the
assembly
in
a suitable carbon solvent.
Fig.
AC62C
—
Injection nozzie sectional
view.
Fig.
AC62B—Using Bosch tool
(S) to
center
the nozzle
tip
whiie tightening
the cap nut.
1.
Cap nut
2.
Jam nut
3,
Adjusting screw
4,
Spring retaining
cap nut
5.
Spindle
6. Spring
7.
Lower spring seat
44
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