Chapter 3 Fuel Injection Equipment
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3.4JH3(B)(C)E
3-2
Inspection
of
fuel injection pump
(1) Inspection of plunger
1)
Thoroughly wash the plungers, and replace plungers
that
have
scratches
on
the
plunger lead
or
are
dis-
colored.
2} The
plunger
is
in goad condition if it slides dawn
smoothly
when
it
is
tilted
about
so·.
Repeat this
several times while turning the plunger. Repair
or
replace
if
it slides down tao quickly
or
if it stops part
way.
(2) Inspection
of
delivery valve
1) Replace
as
a set
1f
the
delivery valve suck-back collar
or
seat are scratched, scored, scuffed, warn, etc.
2) The valve is in good condition
if
it returns when released
after being
pushed
it
down
with your finger
(whHe
the
holes in the bottom of the delivery guide seat
are
cov-
ered). Replace
it necessary.
3}
likewise,
the
valve should completely
dose
by
its own
weight when you
take
your finger off the holes in the
bottom
of
the delivery guide sheet.
NOTE : When fitting new parts, wash with diesel oil and
perform the above inspection.
{3) Inspection of
pump
1) Inspect for extreme
wear
of
roller guide sliding surface.
Scratches
on
1he roller
pin
sliding surface are
not
a
problem.
2) Inspect the
plunger
barrel seat.
lf
there
are
bum
or
discoloration, repair
or
replace
as
this will lead to dilution of the lubricant.
{4) Inspection of fuel camshaft and bearings
1) Fuel
camshaft
Inspect for scratches
or
wear
of
camshaft,
deforma-
tion of key
grooves
and
deformation of screws on both
Printed in japan
HINSH1-H8009
3-19
ends,
and
replace
if
necessary.
2) Bearings
Replace
if
the taper rollers
or
outer race surface is flak-
ed
or
worn.
NOTE:
Replace fuel camshafts
and
bearings together.
(5)
Inspection of roller
guide
assembly
i} Roller
Replace
if
the surface is worn or flaked.
2) Roller
Guide
Replace
if
the
outer rofler pin hole is extensively worn
or
there are many scratches.
3) Replace if the play
of
the roller guide assembly pin/roller
is
0.2
mm
or
more.
4}
Injection timing adjustment bolt
Replace if the surface in contact with the plunger side
is unevenly
or
excessively worn.
(6)
Inspection
of
rack
and
pinron
1) Rack
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Inspect for bending
of
rack
and
wear
or
deformation of
fit with pinion.
2) Pinion
Inspect
for wear
or
deformation
of
fit with rack.
NOTE : If
the
tooth surface or sliding surface is not
in
good
working order, rack resistance increases, affect-
ing the condition
of
the engine (rough rpm, over
running, etc.).
{7)
Inspection of
plunger
spring and delivery spring
Inspect springs for scratches. cracks, breakage, uneven
w~ar and
rust
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