MG TD Series User Manual

B TIlE FUEL SYSTEM- ---------------
The jet needles should be inspected for correct
positioning in the piston. Also see that each Jet is
the same distance below the bridge on each carburette r
choke when the jets are pushed hard up against the
ad]usting nuts.
Unscrew
both throttle adjusting screws until they
wiII just hold a piece of thin pape r between their ends
and the stops. Then screw each one in exactly one
turn.
The engine should now be started. and when really
warm
the speed should be set by turning each adjust-
ing screw exactly similar amounts.
The direction wlll
depend upon whether the engine speed needs In-
creasing
or decreasing. Turning the screws ciockwlse
increases
the engine speed, and vice versa.
Fig. B.12.
This iilustration shows the small universal joints on the
throttle splnd Ie and also the two screws for setting the
engine speed.
Synchronisation of the carburetters must now be
checked. and
the best method Is to listen to each
Intake with a piece of
rubber tube In the same manner
as a stethoscope.
Make
sure the tube Is held at the same point on
each
carburetter and set the throttle adjusting screw
on each until the hissing noise heard In both is equal.
The next step is to adjust the mixture by screwing
the Jet adjusting nuts up or down by equal amounts,
making
quite sure that the jets are hard against the
nuts at all times.
The engine speed will vary when this is being done,
and
the jets should be set so that the engine runs at
the best possible speed for this setti ng of the throttle
stop screws. Final corrections to the slow-running
should
then be made on the throttle adjusting screws,
taking care
to turn each an exactly equal amount.
B.IO
When the mixture is correct on both carburetters
the engine beat will become irregular if one of the
pistons is raised slightly (approximately *: In. or
·8 mm.],
If the piston on one carburetter is raised and the
engine stops. and lifting the piston of the other does
not stop the engine, then this indicates that the
Fig. B.13.
Setting the jet.
mixture on the first carburetter is weaker than the
other; Therefore further jet adjustments must take
place to balance the delivery from both jets.
Correct mixture is indicated by a regular. even
exhaust beat. (An Irregular beat with a splashy
misfire and colou rless
exhaust indicatesa weak mixture.
whilst too rich a mixture produces a rhythmic misfire
or .. hunting "and a blackish exhaust.)
Fig. B.14.
This illustration shows the setting screw for the
lntertonnected rich mixture and throttle ccnerel,
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MG TD Series Specifications

General

Brand	MG
Model	TD Series
Category	Automobile
Language	English