Table of Contents
Advertisement
THE
ENGINE
A
Should the
oil filter
become bloclced,
two relief
valves
in
the
filter
blow off
to
enable
the oil
to by-pass
the
filter
and pass
direct
into
the main
gallery.
Continuous cold running and unnecessary use
of the
mixture control are often
the
cause of serious oil
dilution
by fuel, with
a
consequent drop in pressure.
Particular
attention
is called
to
the recommended
ehaoge of oil every 3,000 miles (5000 lcm.).
Section
A.3
OIL
PRESSURE
JU:UEF VALVE
The non-adjustable
oil
pressure
relief valve
is situated
at the rear of the
left-hand
side of
tile
cylinder bloclc
and
is held in
position
by
a domed hexagon nul
sealed
by t"o fibre washers. The relief valve spring maintains
a valve cup against a seating machined in the bloclc..
The valve sllould be examined to ensure that the cup
is
seating correctly and that the relief spring bas not
lost
its tension. The
latter can
be cheeked by measuring the
length of
the
spring.
To
give the
correct
relief pressure
of 50 lb./sq. in.
(3·52
kg./cm.•)
this
should
not be less
than 3 in. (7·6 em.). Fit
a
new cup and spring if
necessary.
Section
A.4
WATER P UMP
Tbe water pump is of
the
centrifugal impeller type and
is mounted on
a
common
spindle with the fan.
T
he pump
and fan
assembly,
together with the cast-aluminium
inlet
pipe, is auacbed to the front
of the
timing
case by
three studs
and
one
bolt around
the
pump casing
and
one bolt on
the inlet
pipe, and may be withdrawn and
scrvii:Cd
as
detailed
in Sections
C.
7
and C-8.
If the gasket is damaged
as
the pump body is withdrawn
from the timing case ensure tbat all
traces
of it are
removed before
a
new gasket is fitted and
the
pump
replai:Cd.
Section
A.S
CARBURETI"ERS
Remo.-.1
Oisc:onnect
the fuel supply pipe and
the flexible
coo·
necting pipe at the rear carburetter union.
Remo\1:
the
two
set
saews
and
spring
washers
securing
each air cleaner
and
remove the air cleaners. Remove the
split pin and
fia
t
washer
and release the mixture cable
and
clevis pin from
the
mixture
control linkage and release
the mixture
outer
cable abutment
complete
with
bracket.
Remove the
split pin from the jet
lever
intereonnecting
link
to
separate
the two
jet levers. Detach
the
throttle
return
spring and
release the throttle
cable.
Unscrew
the union
nut
and
disconnect the ignition
vacuum control pipe from
the
front carburetter.
Remove the
nut and flat washer on top of each
float .chamber to release the vent pipes.
Remove
tbe four nuts, spring washers, and plain
washers securing each earburetter
flange
and withdraw
the carburetters.
The throttle
cable abutment bracket and
throttle
rerum
spring bracket
will
also be withdrawn.
Replacement
Replacement is
n
reversal
of the above instructions.
Do not
attempt
to
remo•·e
the
c:arburetters and induction
manifold as
an
assembly. The induction manifold
is secured
by
two
studs
iaside
the intakes
and
cannot
be
released
IUitil
tbe carburetters are removed
{Fig.
A. I).
Fig.
A.l
Two of the manifold $tnuing nuts
(arro,.~tf)
are
jiu~d
inside the intakes
Section A.6
INLET MANIFOLD
Removal
Remove the a
ir cleaners and carburetters as detailed
in
Section
AS.
Seven
studs
secure the inlet manifold to the cylinder
bead.
Remove
tbe
nuts,
spring washers, and flat washers,
noting
that two studs
pass through the manifold, the
outs being located inside the intakes (see Fig. A. I).
Replacement
Replacement
of
the
manifold is a
reversal
of these
instructions.
A
new
gasket should be
used.
A
.3
Advertisement
Chapters
Table of Contents
