Injection pump testing nnd adjustment
A
dies.el
engine C
at\1lot
give the full pe
rf
orm
ance
it
should be capable
of
ev
en
if
it
were
in
its best operable
condition, unle
ss
the
in
jection pump and g
ov
e
rn
or
serving
it
arC
eq
uaUy
In
be
Sot
condi
ti
on.
Th
e f
oU
ow
in
g
te
sting and a
dj
usti
ng,
in
stru
ctio
ns
are for making
su
re
th
ji
t t
he
pu
mp
is
in
such a condition and must be carried
out
wi
th
utmo
st
care.
ln
s1
ructions a
ll
the governor
will
be
gi
ve
n
s
ep~
r
a
te
l
y
in
the subsequent section.
The tests and adjustments, set forth unde r thr
ee
head·
ings
, presu
pp
oses the use of special se
rvi
cmg equipment
- t
he
injection pump teste
r.
It should be bo
rn
e
in
mimI
that the pump
and
its governor constitute an inseprable
set and must be tested and adjusted to meet the specified
c
ri
teria before installing them
on
the engine.
(I)
Preparnti
on
(a) Mount the reassembl
e<!
in
j
<c
tion pump
on
the
tester.
Setting up tne pump on the t
est
er
(b) Attach ilie rack
po
sition
me
asu
re. Remove from
the governor these par
ts
: maximum
s.
peed stop-
per,
stop
adjusting screw, idling sprin
g)
torque
sprinS and adaptor
sp
ring.
Push
in the
co
ntr
ol
rack toward the
gO
\l
tm
or side as far
as
it
will
go, and set the r
ac
k P
OS
i
ti
OD measure (95904-
01
060) at the storting positi
on
(zero ntm) .
......-.
-
~
Sen
ing
ra
ck measure
at
O-
mn'l
pOSition
MA
INTENANCE
AN
D A
DJUS
TMENT
(c) Bleed ai, o
ut
of the injection pump,
as
fo
llows:
Filst, moye the s
e'
ecto
r lever
of
the pump
tester
into "injec
ti
on"
pOSi
tion
an
d tum
on
t
he
motor switch to slart up
th
e motor.
Next, produce (
he
p
res
cribed de
li
very
presslJ
re
by meanS of the pressure adjusting valve.
Lo
os
en
tho air bl
ee
de
r
S(;
rew on the pump to let out
the trapped
air,
If
any.
[NO
TE
]
It is n
ot
necessary to "run" the pump in order
to bJ
ee
d air out.
Ai
r bleeding
T
he
pu
mp
is
noW ready r
OT
th
ese operatio
ns:
C
ONTR
OL RACK SLIDING RESISTANCE
TES!'
, INJ
EC
TION TIMING ADJUSTht£NT,
an
d
INJECT
I
ON
QU
ANT
I
TY
ADJUSTMENT.
(2)
Contr
ol
ruck sliding ,..istance test
Run the pump
at
1000 rpm and me
..
ure
th
e
resIstance with the hand spring balance
r.
The
contr
ol
rack
sh
ould
be
capab
le
of sliding witho
ut
offering any resistance
grea
ter than 50 grams (
1.
8
oun
ce
s).
Ch
ec
king rack
slI
ding resistance
69
To Next Page
Loading...
