MG TF Series User Manual

---------------TIIE ENGINE A
Seetion A.39
LOCATING TR.OUBLES
Engine will not start
A. If the starter will not turn the engine, check the
following :-
I. Battery discharged. and Jor defective.
2. Disconnected
or broken leads.
3. Faulty starter switch.
<t. Faulty starter motor.
5. Starter cables shorting to earth.
6. Battery terminals badly corroded or battery
leads loose.
B. If starter turns engine very slowly, check :-
J. Partly discharged battery.
2. Loose terminals or connections.
3. Dirty or corroded connections.
4. Faulty insulation on starter cables.
S. Tightness in engine.
6. Faulty
starter brushes,
C. If starter turns engine smartly. but it will not
fire. check :-
l, Plugs not sparking.
2.
Spark at the coil. If the coil gives good
spark, check :-
(a) Gaps In plugs too wide or too dose.
(b) Plugs oiled up.
(c) Plug
insulators damaged, or dirty.
3. If poor spark at coil, check:-
(a) Low-tension or high-tension leads from
coli
to distributor loose or corroded.
(b) Distributor points dry. worn or out
of adjustment.
(C) Carbon brush not making contact.
(d) Rotor cracked.
(e) Faulty
condenser (substitute a con-
denser known to be in order).
(n Faulty coil (substitute a coil known to
be In order).
4. Check the carburetters for fuel supply. If
no fuel in
float-chambers, check :-
(a) Functioning of the fuel pump.
(b) Air leak In pipe line. indicated by rapid
action
of the pump.
(c) Float-cham ber needIe stl cklng.
S. If fuel Is reaching float-chamber.
check ;-
(a) For choked Jets.
(b) Water in the fuel.
(c)
Dirt in the carburetters.
(d) Air leak in induction system.
(e)
Check adjustment of carburetter con-
trol.
If engine starts, but runs erratically
A. Check the follOWing ignition polnts;-
I. Loose high-tension leads to sparking plugs.
2.
Incorrect setting of plug points.
3. Damaged plug
or moisture on plugs.
4. Loose connection on battery or In Ignition
circuit.
S. Faulty high-tension
leads.
6. Battery charge low.
7. Battery connections faulty.
8. Defective contact breaker.
9. Defective distributor.
10. Faulty condenser.
8. Check the following carburetter points :-
I. Water in the float-chambers.
2. Choked filters in carburetters or fuel pump,
Indicated by slow pumping offuel pump.
3. Action of fuel pump. Suspect If sluggish.
4. Jet partially choked.
S. Carburetters set too rich. Indicated by sooty
exhaust.
6. Fuel
tank filler-cap vent choked.
7. Obstruction In fuel feed pipe.
8. Air leak Into induction system.
C.
Check the following mechanical polnts:-
I. Stlcki ng valves.
2. Incorrect valve clearances.
3. Burnt or broken valves.
4. Incorrect valve timing.
S.
Incorrect Ignition timing.
6. Broken or weak valve spring.
7. Valve guldes
worn. causing air leaks.
8. Cylinder head gasket for leaks.
9. Back-pressure due to damaged exhaust
system.
If engine starts and stops
A. Check the followlng Ignition points :-
I. Loose low-tension leads.
2. Loose distributor damp screw.
3. Faulty ignition switch contact.
B.
Check the fcllowing carburetter polnts :-
I. Incorrect setting of carburetter controls.
2. Blocked fuel pipe.
3. Water In float-chambers.
4. Sticking needle valves.
S. Fuel pump failing to function regularly.
6. Air leak Into fuel line.
7. Fuel level low In
tank.
A.27
Wishvilles Classic
Automobile Library

MG TF Series Specifications

General

Brand	MG
Model	TF Series
Category	Automobile
Language	English