FUEL
SYSTEM
I.
PETROL TANK
The petrol
tank
has been modified slightly
to accommodate the occasional seat, its
capacity is thereby reduced to 12 gallons.
2.
FLEXIBLE
FUEL
PIPES
A flexible fuel pipe connects the
twin
carburettors and is integral with a short
feed line which is co~lnected to the Bundy
tubing at a point adjacent to the thermostat
housing.
3.
CARBURETTORS
S.U.
H6
type carburettors are fitted to this
engine. This carburettor has a four-point
mounting but is similar in other respects
to the H4 used on
the.TR2, is identical in
operation and requires the same main-
tenance.
Carburettors fitted to early
cars
were
equipped with
"
TD
"
needles, while with
later
cars
"
TE
"
needles were used, this
needle in
turn
was superseded by
cc
SM" at Engine No. TS.10037E.
&E
needles are changed for an reason a pair
B
of type
cc
SM
"
should
be
tted.
4.
AIR
CLEANERS
The air cleaners are similar to those fitted
to the TR2 apart from the off-set mount-
ings.
5.
INLET MANIFOLD
This has been modified to accommodate
the four-point fixing H6 carburettor, and
manifolds fitted to engines after TS.9350E
have a larger bore to
align
with the enlarged
throat area of the high
port
combustion
head.
6.
TO REMOVE FLEXIBLE
FUEL
HOSE ASSEMBLY
(a)
Hold the hexagon of the flexible hose
assembly and disconnect the union
nut of the rigid pipe adjacent to the
thermostat housing.
(b)
Withdraw the banjo bolt from one
carburettor, collecting the gauze filter
and retaining spring.
(c)
Repeat operation
(b)
with the second
carburettor.
7.
TO
FIT
FLEXIBLE
FUEL
HOSE
ASSEMBLY
(a)
Position the filter assembly in the rear
carburettor float chamber, spring first.
(b)
Feed a fibre washer on to the banjo
bolt, followed by the banjo connection
and a second fibre wa$er, and then
attach to the
rear
carburettor and leave
finger tight at this juncture.
(C)
Repeat o ration
(a)
and
(b)
with the
ge
front car urettor.
(d)
Holding the hexagon of the flexible
hose with a spanner, attach the union
nut of the rigid supply pipe and secure
to give a petrol tight joint.
(e)
Adjust the position of the banjo con-
nections on the float chambers of the
twin
carburettors so as to avoid any
strain, and tighten banjo bolts
to
give
a petrol tight joint.
(f)
Start the engine and observe the fuel
pipes for leaks.
8.
CARBURElTOR DETAILS
The instructions given for
the
H4
car-
burettor as fitted to the TR2 apply to the
H6
type
apart from the four-point mount-
ings.
The jet needles at present used in
normal manufacture are of the
"SM"
type,
although with early releases of the
TR3 model the
"
TD
"
or
cc
TE
"
needle
~
was fitted.
The
"
TD
"
or
cc
TE
"
needles in both
carburettors should
be
replaced b
cc
SM
"
if
damage or wear justJes
%
exchange in either unit.
g.
AIR
CLEANERS
The air cleaners have off-set mounting and
must
be
positioned on the carburettor air
intake in such a manner that the off-set is
rearward.
10.
INLET MANIFOLD
The inlet manifold is removed and fitted as
those fitted to the TR2 engine.
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