Sun Microsystems MCS 2000 SL - Page 75

7 If the vehicle does not have
a
mag
probe
or
the
magnetic
timing option
is not installed,
check the t'iming with the timing
light.
Clean
the
crankshaft
pulley
and timing
pojnter.
Use
a
piece
of chalk or
white
touch-up
paint
to mark the
pointer
on
the
pul'ley
and
the zero
line.
Turn
the timing advance
knob
on the timing
light
fully
counter-
clockwise
(off)
until
it
clicks.
Then
place
the onloff
button
in the off
posit'ion
(white
dot out).
Connect
the
red
crocodile-clip of
the
black
twin lead
to the
positive
battery
terminal.
Connect
the
black crocodile-c1ip of
the
black
twin lead to
the negative
battery
terminal.
'10.
OPTiON Clamp
the
green
ammeter
pick-up
around
the
negative
battery
cable
(around
all wires
jf
there is
more
than one)
with the arrow
on
the
pick-up
pointing
away
from the
battery.
DIESEL
TEST PROCEDURE
To
show the
pressure
waveform,
you
have
to select diesel
test in
the
scope
functions menu
(see
chart 2 on
page
12).
The
picture
which is
shown on the
scope
should be
similar
to the
picture
of
figure
39.
The figure
shows
the
pressure
jn
the injector line. The
curve
rises
at the
beginning because
the
pressure
is increasing,
until
the injector
starts to inject the
diesel
fuel into
the
cylinder.
Then the
injector stays
open
for
a certain time,
so
the
pressure
decreases. The
injector
stops
injecting
at
point
1. When the
pressure
has
dropped to a certain
level
the
spring
in the injector
returns the'injector needle
to
its
seat'ing.
After
that,
the
pressure
drops to the normal
system
pressure.
The
signals
of
the
other cylinders
should be similar to one another. To
display
the
other
signals,
the
clamp-on has to
be clamped onto each
injector
line in
turn. Be
sure
each clamping
place
is
clean, to avoid damaging the
delicate measuring
surfaces
of
the
clamp-on.
To measure
RPM,
timing
and Current
you
must
use the
multimeter test.
(See
chart 2
on
page
12).
Clamp-on
transducer
I
o
t
f
I
Cylinder
number 1
Ground
clip
(Diesel
option)
Figure
38,
Clamp On
Transducer
Page
69
L
rw-
L