MG midget mark 3 - Carburetter Tuning Steps; Gearbox and Rear Axle; Gearbox Oil Level Check; Rear Axle Oil Level Check

Fuel System
12. Star t the engine. Turn the jet adjusting nut (5) on both ca rburetters in the
same direction, one flat at a time to weaken or down to richen within the
limits of the adjustment restrictor
unt il the fastest speed is recorded on the
tachometer. No w
turn the nut s up slowly until the speed just comm ences
to fall. Turn the
nut s down very slowly. by the minimum amount until the
maxi mum speed is regained.
13. Usi ng the exhaust gas ana lyser check that the percent age CO reading is
within the prescribed limits.
If the reading falls outside the limits reset both
jet adjusting screws equ ally by the minimum amo unt necessa ry to bring the
rea ding just within the limits. If a smoo th idle at the corr ect speed or the
presc ribed CO reading c
annot be obtained you sho uld consult your Austin
MG Dealer.
14. Recheck the idle speed and
carburetter balance and adjust as necessary
with the throttle adjusting screws.
15. Set the
throttle interconnection clamping levers so that the link pin is
0·012 in. (0'31 mm.) away
from the lower edge of the forks (see inset 8)
as follows:
16. Stop the engine and slacken
both clamping bolt s (6) on the throttle spindle
interconnection.
17. Inser t a 0·012 in. (0'3
mm .) feeler gauge (7) between the throttle shaft s top
an d the car bur etter heat shield. Move each th rottl e spindle interconnection
lever downwards until
the lever pin rests on the lower arm of the ca rburetter
thr ottle fork. Tighten the cl amping bolts (6) Fig. 4 on each for k, ensuring
that there is approximately
-hin. (0'79 mm. ) end float on the i nter connection
rod. Remo ve the feeler g
aug e. Th e pins on the throttle spindle lever should
then have cle
arance in the throttle fork .
18. Ensure that
-h in. (2 mm.) free mo v ement exists before the cable starts to
pull on the lever.
19.
Run the engine at 1,500 r.p.m. and check the carburetters for balance .
20. Pull out the mixture
control knob until the linkage is about to move the
car bure tter jets. Lock the knob in positi on.
21. Using the balance meter to ensure equal
adju stm ent, turn the fast idle
adjusting screws equally to give the fast idle speed- see 'G
ENERAL DATA'.
Stop the engine.
22. Refit
the air cleaners.
GEARBOX AND REAR AXLE
Gearbo x To gain access to the gearbox c ombined oil filler and level plug, lift the floor
Fig. 1 covering on the left-h and side of the gearbox cover and remove the rubber plug.
Clean
around the filler plug before remov ing it.
The oil level should be m aint ained at the bottom of the filler plug ap erture
thre ads.
Rear axle A combined oil filler and level plug is located on the rea r of the axle. The oil
Fig. 2 level should be m ainta ined at the bottom of the plug apert ure; ensure that the
car is standing level when.checking. Afte r to ppin g up the oil level, allow sufficient
time for any surplus oil, which may have been added accidentally, to run
out of
the
aperture before repla cing the plug .
Ensure that the
rear axle oil is not drained when the After-sales Service is c arri ed
out.
Fig. 1
Fig.
2
within the prescribed limit s. If the reading falls outside the limits reset both
jet adjusting screws equ ally by the minimum amo unt necessary to bring the
rea ding just within the limits. If a smo oth idle at the corr ect speed or the
prescribed CO reading c annot be obtained you s hou ld consult your Austin
MG Dealer. .
14. Recheck the idle speed
and carburetter balance and adjust as necessary
with the throttle adjusting screws.
15. Set the
throttle interconnection clamping levers so that the link pin is
0·012 in. (0'31 mm.) away
from the lower edge of the fork s (see inset 8)
as follows:
16. Stop the engine
and slacken both clamping bolt s (6) on the throttle spindle
Rear axle A combined oil filler and level plug is located on the rea r of the axle. The oil
Fig. 2 level should be m ainta ined at the bottom of the plug aperture; ensu re that the
car is standing level when.checking. After toppin g up the oil level, allow sufficient
time for any surplus oil, which may have been added accidentally, to run out of
the
aperture before replacing the plug .
Ensure that the
rear axle oil is not drained when the After-sales Service is c arri ed
out.