Check that the battery is at least 70% charged
and in good condition. If the battery is not satisfactorily charged,
re-charge from an external source, as necessary. Note: A battery
in poor condition will cause difficult starting.
2. Ignition System
Faults in the ignition system can often result
in symptoms similar to those caused by a fault in the fuel system. Check
both LT and HT circuits.
3. Petrol Tank Breather
The petrol tank breather must be inspected to
ensure the tank can breathe properly. If air cannot enter the tank, a
depression will be formed. Eventually no fuel will be drawn from the
tank, and the engine will stop.
4. Back Leakage Return to Tank Pipe
If the back leakage pipe (return to the tank)
is obstructed, a pressure build-up will occur on the cam follower seal.
This will result in over-fuelling and in extreme conditions the seal
will be unseated.
Connect vacuum gauge into depression signal
line, i.e. in the pipe line between (center pair) air intake manifold
and the metering distributor vacuum connection. With engine running at
‘tick over’ speed (850 rev/mm) gauge should read: 7”
Hg (180 mm Hg) for TR5/6, and 12” Hg (305 mm
Hg) for 2.5 liter. If reading is low, reset tappets, synchronize throttle butterflies, and check ignition timing.
6. Fuel Supply
Finally, check that there is sufficient clean
fuel in the petrol tank to supply the engine’s requirements. (The fuel
pump should deliver at least 100 cc (100 ml) in 5 seconds.)