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(3)
Checking the Discharge Rate of the
Fuel Pump
Check the discharge rate as illustrated.
The pump must deliver over 200 cc (.422
pints)
of
fuel
in
15 seconds.
Fuel Injection Pump
This fuel
injection pump is a double-barrel pump installed
in the
cylinder block and consists of pump element (plunger assembly), deli-
very valve, tappet and smoke set device.
The pump is mounted at the
front right side of the cylinder block and delivers the fuel under
pressure
when
the
pump
cam
rotation
pushes
the
plunger
up
which
reciprocates through a fixed stroke.
(1)
Control of Injection Rate
The fuel
injection rate
is
increased or
decreased
by
relative position of the plunger lead and plunger barrel.
is rotated by the control pinion installed on the outer
the plunger barrel.
chang ing
the
The plunger
periphery of
The lower flange of the plunger fits in the slit of this plnlon, and
the rotation of the pinion is transmitted directly to the plunger.
This control pinion is driven by engine power through the camshaft,
governor weights operated through centr ifugal force, governor sleeve
and
throttle linkage.
Therefore,
when the fuel rack moves to the
right, the amount of fuel injected decreases, and when the fuel rack
moves to the left, the fuel increases.
1. Delivery valve holder
Q)
2. Delivery valve seat
3. Control rack
(j)
4. Pump body
5. Tappet
®
6. Stopper
7. Delivery valve spring
@
@
8. Delivery valve
9. Air vent screw
@
10. Plunger barrel
iJ)
iJ)
11. Lock pin
12. Control pinion
®
®
13. Plunger
14. Union bolt
@
15.
Upper seat
16. Spring
®
17. Lower seat
18. Return spring
68
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