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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
for 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
f lange
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
dth
of slot in
control
sleeve
Inspect
the sliding
surf.ces .of
plunger
and barrel
ror
wear, scratch marks
and
evidence of
pitting
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 surface
luster
.
If
::my
of the
four plungers
;s
in
defective
conciJtion
to require
replacement
,
then a1l fout
pumping
elements
(plunger
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
fOU09.010g
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
should
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
- 2844)
150
(2133)
plunger
in
barrel
at 200 rpm
In
addWon to the above
requirement, each
pump-
ing
element
has
to
mee
t the
foUowing requiremem
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 outside the
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