Chapter 3 Fuel Injection Equipment
3. Disassembly, Reassembly and Inspection of Fuel Injection Pump
4LHA Series
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
discolored.
2) The plunger is in good condition if it slides down
smoothly when it is
tilted
at about 60°. Repeat
this several times while
turning
the plunger. Repair
or replace if it slides down too quickly or if it stops
part
way.
2) Inspect the plunger barrel seat.
If there are burrs 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
ends, and replace if necessary.
2) Bearings
Replace
if the taper rollers or outer race surface
are flaked or worn.
NOTE: Replace fuel camshafts and bearings together.
(5) Inspection of roller guide assembly
1) Roller
Replace
if the surface is worn or flaked.
(2)
Inspection
of
delivery
valve
1)
Replace
as a set if the delivery valve suck-back
collar
or seat is scratched,
scored,
scuffed, worn,
etc.
2) The valve is in good condition if it returns when
released
after being pushed down
with
your finger
(while
the holes in the
bottom
of the delivery
guide seat are covered).
Replace
if necessary.
3) Likewise, the valve should completely close 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 the roller guide
slid-
ing surface. Scratches on the roller pin sliding sur-
face
are not a problem.
2) Roller guide
Replace
if the roller pin hole and the surface in
contact
with
the plunger side is extensively worn
or there are many scratches.
3)
Replace
if the play of the roller guide assembly
pin/roller is 0.2 mm (0.0078 in.) or more.
4) Roller pin
Replace
the roller pin if its play in the radial
direction is great.
3-2-26
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