5)
To service nozzle tips, wash them
well
in
clean cleansing oil, carefully fit
valves
onto
their respective seats
in
oil
and after washing them clean once
more,
put
together
in
clean
gas
oil.
Never
wipe them with waste cloth, etc.
6)
Nozzles usually let a little fuel
go
back. Excessive increase of return
fuel
is
an
evidence
that
they must
to
replaced with new ones.
7)
To
install nozzles, clean off carbon from nozzle seat packings,
but
be
careful
not
to
scratch or otherwise damage seats. Any seat notably sunken
in
the
surface must
be
replaced, for it
will
spoil air-tightness
of
cylinder even
if
clamped down tight.
To
install, screw nozzles by about 5kgm
of
clamping
torque.
To
strain them.
4-4 Fuel injection pump
1)
For checkup
of
oil
level
and change
of
oil, refer
to
Sect.
1,
"Lubrication".
(Mechanical governor
is
forced lubrication
by
engine oil,
so
it need not check
up of
oil
level
and change
of
oil)
2)
Being
precision-machined and adjusted like nozzles, injection pump
will
not
require any particular adjustment
but
at
the time of over-hauling, it should
be
thoroughly adjusted by means of a pump tester. If anything unusual noticed
with it. have it examined and
if
necessary. serviced
by
your dealer or
at
a
service shop.
In
such a case that. nozzles having nothing wrong at all.
combustion does
not
go
well
in
any of cylinders. check
as
follows.
a)
With
the
engine running, loosen either cap
nut
on one injection pipe after
another.
So
you
will
fined the cylinder from which the symptom comes. Such
symptons come from. for example, the following causes.
b)
Set
screw on pinion
is
loose.
In
this case. injection rate
is
out
of perfect
control,
that
is
to
say.
not
varying exactly
in
conformity
to
control rack
travel.
c)
Plunger spring
is
broken.
d)
Delivery valve spring
is
broken.
To
inspect it. loosen delivery
valve
spring.
Broken spring keeps injection from breaking clean off for poor sucking back
of
fuel.
Inspect
the
contact of delivery
valve
seat. too. If badly worn or otherwise
defective. pull it out
to
replace
by
means of a special tool intended for that.
In
putting together again. attach a new gasket
to
valve
so far
as
possi~le.
In
these
operations. take every possible measure
to
keep off dust. Remember that
valve
holder must be screwed exactly
to
3.5kgm of clamping torque
wit~
a torque
wrench ..
-
26-
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