bolt by
about
a one·flfth
(l/S)
rotation
chang.s
<he
beginning
of
injection by about I degree.
(0)
Tappet
cl
earance measurement
By
the
term
"tappet
clearance"
is
meant
the
marginal
upw
ar
d stroke
of
the
tappet
from its
t
OP
dead
cent.r
pOSition,
thr
ough which
the
tappet
can
~
moved
by
forcing
with
a
Ie-ver.
This clearance is prescribed
to
be n
ot
less than
<he
vo
l
u.
speciOed belo
w,
lind normally should
not
rtquire
any
ad
ju
stment. Thus,
the
purpose
of
this
measuremen
t
ju
st for
making
sure
that
SOme
cl
e
arance
greater t
han
the.
sp
ecified mini-
m
um
is
ava
il
able
.
Un
it
: mm (in.)
Item
Standard
Tappet
cl",
..
nce
0,2
(0.0079),
minimum
.'
Use
the
tapptt
c1earanoe measuring device
(9S904-02100),
as
shown,
and
lever up
<he
tappet which
is
pushed up
all
Ihe way by
the
cam. If the reading happens to
be
les
s
thanlhe
minimum,
increa
se
it
by
means
of
the
tappet
adjustIng bolt. without causing the
inj
ection
iming (beginning
of
inj.clion)
to
devi.te from
the
I·deg. toleranc • . Incre.sing
the
tappet clear·
i.\m:e
will
increase
lhe
pre-s.troke
;
be
s
ure
Dot
to
exceed
<he
u
pper
limit
[2
.0
ntrn (0.0787 in.)] .
v
Measuring
tappet
clearance
The injection is properly timed in the injeetion
pump
when
all four pumping element, have
their
pre·strok,
and
tapptt
dearanc
e uniformly
set
to
the
s
p
~clficaLions,
with the
fOUI
ang:ulal
intervals
between
sllc'Cessive
beginnings
of
injec
-
ti
on
are
equalized
within
the
given
tolerance
_
(4) Injection
quantity
adjustment
"Injection
quantity" is
expressed
in
terms
of
cubic
centimeters (cc)
of
fu.1 d.Uvered by each pumplIlg
e.lement
for
m3.nY
:itrokes
of
its
plunger.
This
MAINTENANCE
AND
ADJUSTMENT
quantity
is measured as follows:
Close
the
nozzle
ho
l
der
overflow valve, so t
hat
the
injection nozzle will
spray
out the
fuel
delivered
by its
pumping
element. Have the high·pressllle
pump of the teSter laken
out
of
service
by
disen
-
gaging
its
cJULCh.
.
Keep
the
~lector
lev
er
in "
injac
.
tion" pos
iti
o
n_
[NOTES]
.)
Keep the fuel
supp
ly
pr
essure
at
2.0
kg/em'
(28.4
ps
i)
.
b)
Be
su
re to u
se
3.
measuring
cyJUlder
f
or
each
pum
ping
element.
c)
To
empty
a measuring cylinder, in to w
hi
ch
fu.el
has
been
sp
r
IlY-Bd
,
be
sure
to
invert
the
cylinder
and
ke-ep
it m
tha
t position
for
ilt
lea,t 30 seconds before
using
ir for
th
e
subsequent measurement.
Take
three
measurements on
each
pumping ele·
ment.
one:
measurement
for
each
set
of conditions,
namely, pump speed.
rack
position and number
of
st
rokes.,
and
compare the measurements
taken
with
the
specifications:
Injection
quantity specifications
Pump
Rack
Injoction
Difference
,peed position
Stroke'S
quantity
cc
lcu in.\
rpm
mm(in.)
"'leu
in,)
1000
8.5
200
7.2
-7
.8 0.4
(0.335)
(0
.44 - 0.48)
(0
.02)
1000
&.0
200
6.4
-7.0
0.4
(0.315)
(0.39 -
0.43)
(0.02)
200
6.0
500
5.0 - 8.0
1.0
(0136)
(0.31
- 0.49)
(0.06)
If
any
pumping
elemenl
i,
noted
'
10
deUve, too
much
or
too
Ut1le
fuel
,
adjust
it
to
bring
irs
in
jection quantity into
the
range
specifi~d
by
displacing the
control
sleeve relative
to
the pinion.
Loosening
tho
pinion clamp screw allows
the
sJee,,
-e to
be
rotated
in
the
pinioo;
turning
the
sleeve toward the governor side
in
c
reases
the
injection qU3Illity t
and
vice
vena.
Be sure
to
set
the
pinion and sleeve accurately
so
th.t
all
four
pumping
elements will deliver the
same
arnounl
of
fuel without exceeding the limit,
indicated above, on
di
f
ference
betw-een
the
l
argest
and
the
sm:illest
measurement
.
Be
sure
to
tighten
the pinion
clamp
strOW
good and hard after adJu,t·
ing the contiol sleeve.
71
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