Perkins L4 Workshop Manual - L-36 Fleet

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Iel InjectÎon System-continued
to the Cuet pump. Such difficulties, with the
likely cause and suggested cure, are set out on the
following ta bie. The fust move when a Cuel pump
is suspected should be to uncouple the piping
between the fuel pump and the atomisers. If the
engine is then rotated with the pump con trol rod
set at ruil load position it will be seen whether
or not the Cuel is being deliver.ed. Observe each
discharge outlet on the fuel pump to see if all
discharge outlets are in order. On the following
table the word .. pump " applies to the pump unit
block as a whole or to individual elements, and
the numbers reCerred 10 are shown in Fig. S.ll.
1. Engine will not Start, or Stops af ter a short
time.
2. Engine does not pull.
Quantity of (a) Delivery
fuel delivered valve. 21
per stroke
insufficient.
~b) Pressure
system joints.
3. Engine emits black smoke.
57
Ir leaking, clean joint
races and tighten.
Condition or sugaested
Possible Cause. Location. remedy for correct
working.
Quantity of
Cue! delivered
per stroke
excessive.
Ca) Regulating
quadrant, 24.
Ir moved. duo to scrow
being 10050, proceed as
in (r)
Condition or suggcsted
Po~iblc Causc. Location. remedy for correct
,
Pump does not (a) Fuel cock.
deliver fuel.
(b) Fuel tank.
(c) Fuel inlet pipe
or filter
elements.
working.
Must be open.
Must contain an adequate
supply.
Clean pipes. examine
filter elements and. if
choked. clean them as
Control rad (a) Pump Proceed as in (r)
has jammcd. plunger. 20.
(b) Control rod Proceed as in (r)
NOTE : Ir air is in system, the suction side of lift
pump should fust be examined.
PNEUMAnc GOVERNOR
...,
,
,
Pump does
not deliver
fuel uniformly.
(d) Air in pump.
(e) Delivery
Valve.21.
(f) Pump
plunger.20.
(g) Air in pump.
(h) Delivery valve
spring, 22.
(j) Delivery
descnbed in Section G.
Air vent filter and
pump as described on
page 56.
Clean and inspect. Ir
worn or damaged. replace
both valve and
seating.
Return the pump in-
tact to the nearest
service station or to
Perkins Engines ltd.
Air vent filter and
pump as described on
page 56.
Replace if broken.
If damaged on face or
Adjustment of tbe pneumatic govemor is
etfected at the works when the engine is erected.
It is an operation requiring considerable skill.
Tbe idling stop on the buttertly valve and tbe
adjusting screw on the cap of the govemor have
to be manipulated altematively until smooth
running at the desired idling speed is achieved.
No subsequent adjustment is, in fact, needed.
Any deterioration in the smoothness of idling is
due to some defect which bas arisen elsewhele
and should he looked for under the paragraphs
in tbis section devoted to care of tbe fuel system
generally.
1
valve.
(k) Tappet
spring, 1 S
guide replace.
See (f) above.
MAINTENANCE
...
(1) Pump
plunger. 20.
(m) Fuel inlet
pipes or filter
elements.
(n) Fuellift
pump.
5ee (f) above.
Proceed as (c)
This pump may not he
operating efficiently.
See instructions on
page 56.
Tbe tmiest pinhole or crack in the leather
diaphragm will affect the operation of the governor.
If such a .ault is suspected. test in this way.
(a) Remove vacuüm pipe.
(b) Move the stop lever into " stop" position.
(c) Place a finger over the diaphragm housing
:0) Tappet adjusting
scrcw.
:p) Cam profiles
Proceed as in (f) above
Proceed as in (f) above
union in order to seal it.
(d) Release the stop lever.
I
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