Air Cleaners And Fuel System - Perkins 4.108 Workshop Manual

SECllON N
Air Cleaners and Fuel System
AIR CLEANERS
Operating conditions play an important part in de-
ciding how frequently it is necessary to service the air
cleaner. If you are working in dusty conditions then
the air cleaner should be attended to every day. as
indicated under "Preventive Maintenance".
If not already fitted, you should consider the fitting
of an 18 in water gauge RESTRICTION INDICATOR in
the air trunking between the air cleaner and the engine
induction manifold. It indicates by means of a visual
signal when the air cleaner element needs servicing.
A means of visual signalling for the "Rotopamic"
type air cleaner failure is the use of the "DUST
SIGHT". A window in this device becomes cloudy
when the system has failed', but this type of indicator is
usually only used with the two stage extreme heavy
duty cleaners.
The type of air cleaner fitted to your vehicle or
machine depends upon the manufacturer of your equip-
ment. Usually, guidance for the method of servicing is
shown on the b'ody of the air cleaner. but the following
advice will also help.
Dry Type Two Stage "Cyclopac" See Fig. N.1
The dust bowl collects the heavier particles which
are thrown out by the centrifuge path of the air. This
dust enters the bowl by the slot in the baffle plate. The
level of dust in the bowl must not be allowed to reach
to within half an inch of the slot in the baffle plate.
For cleaning purposes the assembly should be re-
moved from the engine. With horizontal installations the
slot in the baffle is located at the top.
Remove the dust bowl by releasing the pinch
screwed clamp. Remove the baffle from the interior of
the dust cup by lifting it out, which gives access to the
dust for removal. The element can be removed by
releasing the wing nut.
Renew the element or clean by back flow air pres-
sure no more than 100 Ibflin 2 or washing in a non
foaming detergent as recommended by the air cleaner
manufacturers. Allow the element to soak for at least
ten minutes and then gently agitate. Rinse the element
with clean water and allow to dry. Do not use oven
heat.
WARNING: There is a danger that some of the dust
remaining in the element after it is washed will be
pulled through into the engine if the element is re-
placed in a wet condition. The reason for this is that
the water acts as carrier for the dust.
2 3 4 5
6
N1
'1. Body Assembly
2. Element Assembly
3. Nut and Gasket Assembly
4. Clamp Assembly
5. Baffle Skirt
6. Cup Assembly
Inspect the element by placing a bright light in its
centre. Any pin holes, thin spots or ruptures render the
element unfit for further use. This cleaning procedure
reduces the effective life of the element.
With all dry type elements, they should be renewed
after six cleanings and at least once a year, which-
ever occurs first.
Never use petrol (gasoline) for cleaning.
Dry Type Two Stage "Cyclone" See Fig. N.2
The AUTOMATIC DUST EJECTOR should always be
kept clean and the lips of the rubber ejector checked
to see that they close but do not adhere together.
To service the element, unscrew the clamping screw
and remove the element retaining strip. Remove the
seal plate (if fitted) and element.
If the element is contaminated by dry dust, clean
by carefully tapping by hand or by directing low pres-
sure compressed air on to the clean side of the ele-
ment. If the element is contaminated by oil or soot, it
can be cleaned by washing in a suitable non-foaming
detergent. After washing, rinse out thoroughly by
directing clean water to clean air side of element and
allow to dry - do not oven dry.