FUEL
SYSTEM
24.
INSPECTION
OF
PARTS
26.
TO REMOVE
AIR
CLEANERS
For Notation
see
Fig.
5.
This is required each time the carburettors
Firstly, all parts must be thoroughly cleaned
are tuned or to service the cleaner itself.
to ascertain their condition. Wash all parts
in the locality of the valves in a clean
(a)
Loosen the cap nut on the top of the
paraffin bath separate from that employed
carburettor float chamber and
turn
the
splash overflow pipe away from the
for the other and dirtier components.
Diaphragm and pull rod assemblies should
air filter.
normally be replaced unless in entirely
(b)
Withdraw the two bolts securing the
sound condition without any signs of air cleaner to its mounting flange.
cracks or hardening.
Upper and lower castings should be
(c)
The air cleaner and joint washer can
examined for cracks or damage, and if
now be removed.
diaphragm or engine mounting flanges are
distorted these should be lapped to restore
their flatness.
27.
TO FIT
AIR
CLEANERS TO
All
badly worn parts should be replaced,
CARBURETTORS
and very little wear should be tolerated on
(a)
Adhere the joint washer to the body
rocker arm pins (26), the holes and engage-
of the air cleaner with a smear of grease.
ment slot in links
(22), holes in rocker arm
(23). On the working surface of the rocker
(b)
Ensuring the splash overflow pipe
arm (23) which engages with the engine
does not foul the air cleaner, offer the
eccentric, slight wear is permissible but
cleaner to the carburettor in such a
not exceeding
,010"
in depth.
manner that the holes adjacent to the
The valve assemblies (5) should not be
setscrew holes are uppermost so that
replaced unless in perfect condition. Dia-
they
will
align with those holes
in
the
phragm springs (1 1) seldom call for replace-
carburettor flange.
ment, but where necessary ensure that the
(c)
Secure air cleaners to carburettors
replacement spring has the same identifica-
with two setscrews and lockwashers
tion colour and consequently the same
each.
strength as the'original. Rocker arm springs
(21) are occasionally found to be broken
(d)
Position the splash overflow pipe so
after service. All gaskets and joint washers
that the open end is close to the
should be replaced as a matter of routine.
filtering media and tighten the cap
This also applies to oil seal (15) held in
nut
in
centre of float chamber.
position by retainer (13).
25.
AC AIR CLEANERS
Description
This cleaner is the wire gauze fitted metal
canister type and is oil damped. The oil
damping is carried out as a servicing oper-
ation.
Each carburettor has its own air cleaner
functioning
in
such a manner that air drawn
in by the engine first passes through the
oiled gauze before entering the carburettor
and so prolongs
the life of the engine.
Whenever the
air
cleaners are being replaced
it is essential that the holes adjacent to the
setscrew holes are uppermost so that they
will align with those holes
in
the carburettor
flange.
28.
SERVICING
AIR
CLEANERS
Unless operating in a very dusty climate
the
AC
air
cleaners need only be serviced
every
5,000
miles.
It
is suggested that
h
dusty climates, the cleaners are serviced at
2,500
miles and this period increased or
diminished according to the
dirt
removed.
The cleaners should be washed
in
a bowl
containing a mixture of paraffin and petro:
until
free from
dirt.
After a thorough washing the units shoulc
be allowed to
dry
in clean
air.
When
dq
they should be filled with engine oil
anc
the surplus oil allowed to drain
in
clean
air
The cleaners must be dried and drainec
in
clean
air
that is as free from dust a
possible to ensure
maximum cleanliness
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