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Fuel
system
Fuel fdle. inspection
Inspect
,he
filter
case
and cover for
crack
s,
distortion
and
damage and
31'0 for
stripped
threads
at
its
threaded
part.
Replace
the
case
and cover
if
found in defective
condition
.
Replace the connectOr bolts and plug
if found
with
defective
thread"
Th, pacltings
removed
in
disassembly
must
be
discarded:
be
sure
to use. new packings
in
r.assembly
.
The
mtering
element is
prescri
bed to
be replaced at
intervals
of
1200 hours. and the
fill
"
itself
b. made
free of sludges. and condensation
by
draining
at in
te
rvals
of
300
hours,
[
NOTE]
The fIltering element is
of paper
type no
t
meant to be cleaned by w.shing.
Use a
soft·
half
brush and
compressed
air
to
dean
it.
Fuel
feed pwnp inspection
(1)
Chock valve
Inspect
tbe
seawlg
faces
of
the
check
valve
rOt
wear,
and
rcpJOlce
parls
found
10
abnormally
or
excessively
worn
condition
.
(2)
Tappet
wear
Mike
the
lapl>el
and
tap pel
hole 10
detennine
their dlarneua
l
wear
.
Repiacemen! is
necessary if
the amount
or wear
noted in comparis.on
with
(he
st.nd"d
dJameter is 0.1
mm
(0.004
in
,)
or
mor
•
.
Unit
:
mm {io.t
Item
Standard
Service
limit
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 and roller
,
is
prescnbed
to be
not
greate
than
0.3 mm (0.012 in.)
,
If this
limit
is
exceeded.
the whole tappet sub·assembly
must
be
replaced.
Replace
the roller
if it
s
diameter
has
worn
down
to
the
service
limit.
Un
it:
mm
(in.J
Standard
Service
Item
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 for
cracks
,
broken
screw
threads
and
other
types of
damage and
repair or
replace
it as
necessary.
(4)
PrimIDi
pump wear
Inspect the
piston
and
cylinder
for
scratc.h
marks,
WUr
and
rusting.
Check
the
seating faces.
of
ils
valve
for
wear.
An
excessively worn or damaged
seating face must be corrected
by
replacement.
Fuel feed
pump
tesliag
The feed pump
is
in
satisfactory
condition
when
it
nleets.
all
of the
test reqUirements
hereunder
enumerated:
(1)
Suction
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 Injection-pump rpm,
with
the discnarge
<ide
of the reed
pump fully
closed
.
Under
this
condition,
tbe
diseh"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
S tandard
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
below 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
dcli
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,,. tIte
feed
pump in
• pool of
futl.
wllh its
discharg. side plugged
up.
Apply an air
pressure
of
2
kg/em'
(28
psi
) to
its suction
to
see If any
bubbles come Qut aflhe
pump.
Some air,
however,
will
leak out
lh1 0ugh the -clearance between its
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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