Sinking Test - Toyota 3b Repair Manual

FUEL SYSTEM
-
lniection Nozzles
[B and 38]
FV-12
One
third
of
its
length
)
-J
(b)
Using a
wooden stick, remove the carbon adhering to
the
nozzle needle tip.
(c)
Using
a
brass brush, remove
the
carbon from
the
exterior of the
nozzle body.
(d)
Check
the
seat
of the
nozzle body
for
burns
or
'corrosion.
(e)
Check
the nozzle needle tip
for damage or corrosion.
lf any of these conditions are present, replace the
nozzle
assembly.
SINKING
TEST
(a)
Wash the nozzle in clean diesel fuel.
HINT:
Do not touch
the nozzle mating surfaces
with your
fingers.
(b)
Tilt
the
nozzle body approx.
60 degrees and pull
the
needle
out about
one
third of its
length.
(c)
When released, the needle should sink down into the
body vent smoothly by its
own weight.
(d)
Repeat
this test, rotating
the
needle slightly
each
time.
lf
the
needle does
not sink
freely, replace
the
nozzle
assembly.
lL