MG MGB User Manual

THE FUEL SYSTEM
‘vil
.........A.
___
_l
-
]
4NC06
3
Fig.
D.
1
3
Carburetter
tuning
(S.U.
HIF4)
1.
Throttle adjusting-screw
8. Bridge.
14.
Cold
start
inter-connection
rod.
2. .Piston lifting
pin.
9.
Jet.
15.
Cold
start
inter-connection rod lever
3.
Fast idle adjusting
screw.
10_ Piston
Clamp
bolts.
7
.
16.
Clearance
of 0.012
in
(0,31
mm)
4‘
Fast Idle
cam'
11' Jet needle“
between
throttle
lever
pin
and lower
5.
Jet
adjusting
screw.
12_ Throttle
intermonnection
rod,
arm
of throttle
fork.
6- PiStondamper-
13,
Throttle
interconnection
rod
lever
17.
Fast idle
cam
positioned
for
fast
idle
7. Piston rod.
clamp
bolts.
adjustment.
12. Connect the
tachometer
of
tool ISO
677 Z
to
the
18. Using
a
balance
meter
in accordance
with
the
engine.
manufacturer’s
instructions,
balance the
carburetters,
13. Start the
engine
and
run
it
at
a
fast
idle
until
it attains
altering
the throttle
adjusting
screws
until the
correct
normal
running
temperature,
then
run
it
for
a
further
idle
speed
(see
‘ENGINE
TUNING
DATA’)
and
■ve
minutes. balance
is
achieved.
Alternatively,
use
a
‘listening
14. Increase the
engine
speed
to
2,500
r.p.m.
for
30
tube’
to
compare
the
intensity of
the
intake hiss from
seconds.
both
carburetters
and
alter the
throttle
adjusting
15.
Connect
an
exhaust
gas
analyser
to
the
engine in
screws
until the
hiss
from
both
carburetters
is
the
accordance with the
instrument
manufacturers
same
at
idling
speed.
instructions.
19. Turn
the
jet adjusting
screw
of
each carburetter
by the
v
Setting
can now commence.
If the
correct
setting
cannot
be
same
amoun_t’
ClOCkWIse
to
eI‘mCh
0‘
aritl'f‘logmse
to
obtained
within three
minutes, increase
the
engine
speed
to
weaken’
mm] the
fastest
engme
speed.” lfldlcated
on
2,500
r.p.m.
for
30 seconds and then
recommence
tuning.
the.
taChgmeter;
tum
eaCh
adju■tlng
So■ew
Repeat
this
clearing
operation
at
three
minute
intervals
anu'CIQCkWIse
by the
same
amount
until the
engme
until
tuningis completed
speed
just
commences
to
fall.
Turn each
screw
very
slowly
clockw13e
by the
minimum
but
same
amount
16. Slacken
both clamping bolts
on
the throttle
spindle
until the
maximum
engine speed
is
regained.
interconnections.
20. Check
the
engine idling
speed
and
re-adjust
it
as
17. Slacken
both clamping bolts
on
the
cold
start
MGB.
interconnection.
Issue 1.
86842
necessary,
turning each
throttle
adjusting
screw
by
the
same
amount.
D.15

MG MGB Specifications

General

Brand	MG
Model	MGB
Category	Automobile
Language	English