MAINTENANCE
AND
ADJUSTMENT
2
Item
Standard
NOl
sreater
than
SO
cc
Feed
pump
air-tightness
(3
cu
in.)lminute (with
bubbles
not
lerger than
3
2 rnm (0.08
inl!.
size)
AIr
prltUurs.
2 kg/em' (28
psI)
(r
~
,
'Jl-
-~
- -
_I
,
o
4
I-Measuring cylinder 3
-P1UV
·,
'
.apPOt
4·Dfesel fuel oil
T!tting
feed pump f
or
Bir-tightn&ss
If
a greater leakage than
the
specified value occurs,
rework the
pu,ruod
hole with a burnishing broach
to the oversize and repl.ce the pushrod
by
a new
oversiz.e
one
.
Injection pump inspection
(1) Wear
of
pwnping elements
(Plunsu
and
baml)
Mike the
width
of
plunger nange. If lhis nangc is
worn down
to
give
a reading less
than
6.95
mm
(O.2736in.)
(=
7 -
0.05
nun (0.2756-0.0020 in.)],
replace
the
plunger.
66
Widlh of plunger flange
M.asure
the
WIdth
of
the
slol provided
in
the
control
sleeve
.
If
this
slot
is
worn
down
to
give
a
reading greater than 7.02
mm
(0.2764 in.), replace
the sleeve.
1.
02
'"
Wi
d
th
of
slot
in
control
sleeve
Inspect the sliding surf.ces .of plunger and barrel
ror
wear,
scratch
marks
and
evidence
of
pi
tting
due
to burning. If
any
defect is
noted,
replace the
whole
pumpUlg
element (plunger and barrel).
Wllelher a plunger
is
worn
or
not
can be told from
its
appearance:
. A
worn
plunger
has
no
s
urface
luster. If
::my
of
the four plungers
;s
in
defective
conciJtion
to
require
r
ep
lacement ,
then
a1l
fout
pumping elements
(p
lun
ger and barrel) should
b.
replaced
to
ensure
Ih.
uniform
pumping perform-
ance
for Ihe four injection nozzles. Th;. replace-
ment
is
necessary also
when
any
of
the pumping
elements
fails
to
meet
the
fOU09.0
10g
test
require-
ment
on
the
sliding
clearance between
plunger
and
barrel:
Fuel-tighlness
lesi
on
pumpins
.Iement
Afler assenlbling Ihe injection pump.
install.
test
pressure
gauge
on
the deu'iery
val"e
holdtr,
and
run the pump
.t
200
rpm,
with
the control rack
held
1D
• position
for
low-load engine operation.
Til.
pressure gauge should
be
c.pabl.
of
indicating
up
to
300 kg/em'
(4266
psi)
or
400
kgJcm' (5688
psi).
When
operated under these test condition,
the pressure
gauge
shou
ld register a pressure
nol
lower
IIlen I
SO
kg/em'
(2133 psi).
Unit: kg/em' (psi)
Standard
Repair
Item
limit
Fuel-tightness
of
150-
200
(2133
-
28
44)
150 (2133)
plunger
in
barrel
at
200
rpm
In
addWon
to
the
above
requirement,
each
pu
mp
-
ing
element
has
to
mee
t the
foUowing
re
q
uiremem
as
proof
of.
proper fit
of
the
plunger
in
lis barrel:
Into the
barrel
removed upon injection pump
disassembly, insert its
plunger
about Iwo-thirds of
the way. leaving a third
of
ilS
lenglh outsi
de
the
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