FUEL SYSTEM - Injection Pump FU-47
2. INSPECT PUMP PLUNGER, SPILL RING AND
DISTRIBUTIVE HEAD
(a) Tilt the spill ring (distributive head) slightly and pull
out the plunger.
(b) When released, the plunger should sink down
smoothly into the spill ring (distributive head) by its
own weight.
(c) Rotate the plunger and repeat the test at various
positions.
If the plunger sticks at any position, replace the parts as a
set.
(d) Insert the governor link ball pin into the spill ring and
check that it moves smoothly without any play.
3. INSPECT PLUNGER SPRINGS FOR SQUARENESS
Using a steel square, check the squareness of the plunger
springs.
Maximum squareness: 2.0 mm (0.079 in.)
If squareness is greater than maximum, replace the springs.
4. INSPECT SPRING LENGTH
Using vernier calipers, measure the free length of each
spring.
Spring free length:
Delivery valve spring
1 PZ and 1 HZ 24.4 mm (0.961 in.)
1 HD-T 19.1 mm (0.752 in.)
Plunger spring
1PZand1HZ 30.0 mm (1.181 in.)
1HD-T 31.2 mm (1.228 in.)
Coupling spring
1 PZ and 1 HZ 16.6 mm (0.654 in.)
1HD-T 15.5 mm (0.610 in.)
Pneumatic bellows spring (w/ HAC)
1PZand1HZ(w/ HAC)
35.0 mm (1.378 in.)
Boost compensator spring
1HD-T (Europe) 19.7 mm (0.776 in.)
1 HD-T (Others w/o BACS)
19.6 mm (0.772 in.)
1 HD-T (Others w/ BACS)
21.8 mm (0.858 in.)
If the free length is not as specified, replace the spring(s).
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