FUEL SYSTEM
-
Injection Pump
FU-15
(b) Remove the following parts from the holder body.
a
(1)
Accumulator assembly
(2)
Distance piece
(3)
Pressure pin
(4)
Pressure spring
(5) Adjusting shim (for opening pressure)
(6)
Stopper
(7) Adjusting shim (for piston lift gap)
HINT: The shims in
(5)
and (7) are the same shape so
keep them separate to distinguish between them.
INSPECTION OF INJECTION PUMP
COMPONENTS
INSPECT SPRING LENGTH
Using vernier calipers, measure the free length of each
spring.
Spring free length:
Delivery valve spring
24.4 mm (0.961 in.)
Plunger spring
30.0 mm (1.181 in.)
Coupling spring
16.0 mm (0.630 in.)
Pneumatic bellows spring
(wl HAC)
35.0 mm (1.378 in.)
Boost compensator main spring
2L-T (Austria)
24.1 mm (0.949 in.)
2L-T (Others)
19.4 mm (0.764 in.)
Boost compensator sub spring
(2L-T Austria)
22.3 mm (0.878 in.)
If the free length
is
not
as
specified, replace the spring(s).
(2L-T Austria)
INSPECT ACCUMULATOR ASSEMBLY
(a)
Wash the accumulator in clean diesel oil.
NOTICE: Do not touch the accumulator mating surfaces
with your fingers.
(b) Tilt the accumulator guide about
60
degrees and pull
the piston out about one third of
its
length.
(c)
When released, the piston should sink down into the
guide vent smoothly by
its
own weight.
(d) Repeat this test, rotating the piston slightly each
time.
If the piston does not sink freely, replace the accumulator
assembly.
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