.
.
~
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Pag~ 57
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.
2. Engine does not pull.
Quantity of (a) Delivery
fuel delivered valve. 21
per stroke
insufficient.
~b) Pressure
system joints.
Ir leaking, clean joint
races and tighten.
3. Engine emits black smoke.
Condition or sugaested
Possible Cause. Location. remedy for correct
working.
Ir moved. duo to scrow
being 10050, proceed as
in (r)
Quantity of
Cue! delivered
per stroke
excessive.
Ca) Regulating
quadrant, 24.
..,
1. Engine will not Start, or Stops af ter a short
time.
Condition or suggcsted
remedy for correct
working.
Po~iblc Causc.
Location.
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
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.
...,
,
,
Pump does not (a) Fuel cock. Must be open.
deliver fuel.
(b) Fuel tank. Must contain an ade-
quate supply.
(c) Fuel inlet pipe Clean pipes. examine
or filter filter elements and. if
elements. choked. clean them as
descnbed in Section G.
(d) Air in pump. Air vent filter and
pump as described on
page 56.
(e) Delivery Clean and inspect. Ir
Valve.21. worn or damaged. re-
place both valve and
seating.
(f) Pump Return the pump in-
plunger.20. tact to the nearest
service station or to
Perkins Engines ltd.
Pump does (g) Air in pump. Air vent filter and
not deliver pump as described on
fuel uniformly. page 56.
(h) Delivery valve Replace if broken.
spring, 22.
(j) Delivery If damaged on face or
valve. guide replace.
(k) Tappet See (f) above.
spring, 1 S
(1) Pump 5ee (f) above.
plunger. 20.
(m) Fuel inlet Proceed as (c)
pipes or filter
elements.
(n) Fuellift This pump may not he
pump. operating efficiently.
See instructions on
page 56.
Proceed as in (f) above
1
...
MAINTENANCE
Tbe tmiest pinhole or crack in the leather
diaphragm will affect the operation of the gover-
nor. 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
union in order to seal it.
(d) Release the stop lever.
:0) Tappet ad-
justing scrcw.
:p) Cam profiles Proceed as in (f) above
,
I
J
J
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