Fuel
system
Fuel fdle. inspection
Inspect
,he filter
cas
e a
nd
c
over
for
cracks, distortion
and
damag
e and
31'0
for
stripped threads at its threa
ded
par
t.
Repla
ce the
case
a
nd
cov
er
if
found
in
defecti
ve
co
ndition.
Replace
the
connectOr bolts
and
plug
if found
with
defective thread"
Th,
pacltings
removed
in
disassembly
must
be
d
iscarded
:
be
sure
to
use.
new
packings
in
r.assembly.
The
mt
erin
g e
leme
nt is
prescri
bed
to
be
re
pl
ac
ed
at
interv
al
s of 1200 hours.
and
the fill" itself b.
made
free
of
s
lu
dges.
and
c
on
de
nsation
by dr
aining
at
in
te
rvals
of
300
ho
urs,
[
NOTE]
The
fIltering
element
is
of
paper
type
no
t
meant
to
be cleaned by w.shing. Use a soft·
hal
f
brush
and
compr
e
ssed
ai
r
to
dean
it.
Fu
el
feed
pwnp
inspection
(1) Chock valve
Inspect t
be
seawlg
faces
of
the
check
valve
rO
t
wear
,
and
r
cpJOlce
parls
found
10
abnormally
or
excessively
worn
condition.
(2) Tappet wear
Mik
e the l
ap
l
>el
and
tap
pel
hole
10
detennine
their
d
larneua
l
wear
.
Repiacemen!
is
necessary
if
the
amount
or
wear
noted
in
co
mparis.on
with
(he
st.nd"d
dJameter is 0.1
mm
(0.004 in,)
or
mor • .
Un
it
: mm {io.t
Item
Standard
Service
li
mit
rappel
diameter 7 (0.276)
0.1 (0.004)
Tappet hole diameter 7 (0.276) 0.1 (0.004)
The overall play
of
tappet
toUer
pin. involving the
pin
hole a
nd
roller
, is
prescnbed
to
be not
greate
than 0.3
mm
(0.012 in.) ,
If
t
his
limi
t
is
exceeded.
the
whole tappet sub·assembly must
be
replaced.
Replac
e
the
roller
if
it
s
diameter
has
worn
down
to
the
se
rvic
e limit.
Un
it: mm (in
.J
Standard
Serv
i
ce
It
em
limit
+0
15
-0.
027
- 0.075
Tappet roUer 0 .0 .
(O59
1
~~.00106)
(- 0.00295)
MAINTENANCE
AND
ADJUSTMENT
(3) Pump housing
damage
Inspect the
hous-itlg
f
or
cracks
, br
oken
screw
threads and other types
of
damage and repair or
re
p
lace
it
as
necess
ary.
(4)
PrimIDi
pump wear
Inspect t
he
pi
ston
and
cylinder
for
s
cratc.h
marks
,
WU
r
and
rusting
.
Che
ck
the
seating
faces.
of
ils
val
ve
for
wear.
An
excessively
worn
or
damaged
seating
face
must
be
corrected
by
replacement.
Fuel
fe
ed pump tesliag
The f
eed
pump
is
in
satisfactory
conditio
n when
it
nl
eets.
all
of
the t
est
reqUi
r
emen
ts
hereu
nd
er en
ume
rat
ed
:
(1)
Sucti
on
perfanno
"c.
Th.
pump should
~.
capable of starling to
deUver
fue
l
in
45 seconds
of
its staning at 150 rpm.
(2)
Discharge pressure
Run the
feed
pump at 600
In
jection-pump rpm,
wi
th t
he
discnarge
<ide
of
the
reed
pump
fully
closed.
Under
this
co
ndition, tbe di
seh"
ge
pres
·
sure should
be
anywhere between
1_
8 kg/em'
(25
.6
p~)
and
2.2 kg/em' (31.3
p<i
).
Unit:
~9/cm'
(psi)
Item
Standard
I
Feed pump disch"ge 1.8 - 2.2 (25.6 - 31.3)
pressure
.t600
rpm
(3) Capacity test
Run the pump at
the speed specified bel
ow
and
ope"
the disch.rge side more
or
1
...
to hold the
discharge
pressure at 1.5 kg/cm
'
(21.3 psi)
(as
rud on
the
test
gauge), with a
meas.uring
glass
cylinder sel
up
to
receive
the
discharged
fut!.
Under
this.
condition,
the
pump
shou
ld
dc
li
1o'tr
at
least 900
ec
(54.9
ell
in.)/minute.
Item Standald
Repair limit
900
co
(55
600ec
(37
Feed pump
cu
in.)/minute.
cu
m.)/minute.
capacity
minimum
at
at J 000 rpm
1000 rpm
(4) Air-Ughtness
Imme
,,.
tI
te feed pump in • pool of futl. wllh its
discharg. side plugged up. Apply
an
air pressure of
2 kg/em'
(28
psi
) to its
su
ction to see If
any
bubbles
come
Qut
aflhe
pump
. So
me
a
ir,
however
,
will
leak
out
lh1
0
ugh
the
-clear
an
ce
between i
ts
push/od
and
houiing. The pump
is
,ufficienUy
air· tight
if
the amount
of
this leak.ge (with
no
leakage from any other part
of
the pump)
is
not
greater
th.a.n
the
value
specifi.ed.
1)5
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