Perkins L4 Workshop Manual - L-36 Fleet
Perkins L4 Workshop Manual - L-36 Fleet
Perkins L4 Workshop Manual - L-36 Fleet
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Fue/ lnjection System-conlinued<br />
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FIG. 57. Atomiser Testing Pump.<br />
ExaminadoD and TestiDg.<br />
A bench suitable for working with atomisers is<br />
preferably linoleum-covered with glass 00 top.<br />
It should he enûrely reserved for this work and<br />
kept absolutely free from din. The use of cotton<br />
waste or fluffy rags must be absolutely forbidden.<br />
The bench should have a dust proof drawer<br />
for holding the atomiser cleaning tools and equipment<br />
described in detail below.<br />
A plate, made up as shown in Fig. 5.6, should<br />
he secured to the bench. lts purpose is to hold the<br />
atomiser securely whilst various maintenance<br />
operaûons are proceeding.<br />
An atomiser testing pump No. ET .122A (Fig. 5.7)<br />
should he available. This outfit bas been specially<br />
designed to provide a reliable means of tesûng<br />
and setting the atomisers. It is made up of parts<br />
similar to the injection equipment fitted to engilles.<br />
The doubtfuI atomiser should<br />
be removed from its wrappings<br />
and fitted nozzle downwards, and I /"<br />
still unwiped, (0 the testing pump<br />
No observaûons should be<br />
made until at least ten fuil strokes<br />
of the hand pump have been given<br />
to expel all air from the system.<br />
Atomiser Pressures.<br />
The pressure at which the spray<br />
breaks should then be recorded<br />
and checked against the recommended<br />
pressure which is 120<br />
atmospheres.<br />
l<br />
'rCMISD NOULI<br />
Page SII<br />
The only exception is in the case of atomisers<br />
fttted to <strong>L4</strong> Engines installed in Marshall Crawler<br />
Tractors where the setting is 160 atmospheres.<br />
Atomisers set at 120 atmospheres have white<br />
painted caps and the caps of atomisers set at 160<br />
atmospheres are painted silver.<br />
An altemative means of identiftcation is a tab<br />
washer fttted under the atomiser cap nut bearing<br />
the letter .. J " for 120 atmospheres, or the letter<br />
" V .. for 160 atmospheres.<br />
<strong>L4</strong> atomisers supplied under the Perpetuity<br />
Scheme have green painted caps with white Ol<br />
silver on the top or a tab washer under the atomiser<br />
cap nut signifying the setting and type.<br />
The spray should now be observed for uniformity<br />
at a rate of pumping of not less than<br />
20 strokes per minute.<br />
Each should be a misty spray spreading to about<br />
3 inches (75 mIn) diameter at about one root away<br />
from tbc atomiser nozzle, then breaking into a<br />
vcry Me mist. There should be two sprays from<br />
cach atomiser nozzle, one pointing outwards from<br />
the top hole, and the other pointing downwards<br />
from the lower hole, when the atomiser is in a<br />
position correspunding to its working position.<br />
An atomiser is good for service if, when operating<br />
tbc atomiser testing pump at the abovc speed, it<br />
gives two etfectivc sprays as above described.<br />
An atomiser is dirty and requircs reconditioning<br />
if (a), when procceding as abovc it throws out<br />
solid wet jets and not braken up spray or (b),<br />
if eithcr of the holes are choked or partially choked<br />
so that spray issues from one hole in the<br />
atomiscr only or appreciably more spray issues<br />
from one hole than the othcr.<br />
In this connection, as tbc <strong>Perkins</strong> enginc idles<br />
at about 500 r.p.m. the atolniser is never called<br />
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'TOMIS" 00.., ,.asu.. 'Acr NO~ VALV!<br />
FIG. S8. Diagrams of Atomiser and Atomiser Body<br />
referencc in the lext.<br />
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the letters have