(2) Cam.
About every
3,000 miles, give the cam the slightest smear of
vaseline.
(3) Contact Breaker Pivot. Every 5,000 miles, place a singl,e drop of oil
on the pivot
"
J
"
(Illustration on page 50) on which the cont~~ct hre:~kcr
works.
Coil.-The coil unit is not adjustable in any way, and req~~ires no
attention beyond seeing that the terminal connections are kept tight, and
the moulded coil top is kept clean.
Warning Lamp.-A narnivg lamp is provided in the instrument p:~nel,
which gii-es
a
red light when the ignition is
"
ON
"
and the car is stationary.
The warning lamp will also light when the engine is running very slowly, due
to the fact that the dlnamo is not running at sufficient speed to generate a
high enough voltage to actuate the cut-out.
The Detection and Remedy of Ignition Faults.-If a failure of ignition or
misfiring occurs, unless the cause is at once apparent the owner is strongly
recommended to procccd in accordance with the following routine which
should quickly enable him to locate the trouble.
Before proceeding with the examination, make sure that the trouble is
not due to defects in the engine, carburetter, petrol supply, sparking plugs, etc.
Engine will
not Fire.-Switch on the ignition, turn the engine and observe
the ammeter reading. The engine should be turned by hand
if
it is known
that the battery is in a low state of charge.
If an ammeter reading is given which rises and falls with the closing and
opening of the contacts, then the low tension wiring is in order. If the
reading does not fluctuate in this way, a
short in the low tension wiring
is
indicated, or the contacts arc remaining closed. When no reading is given,
a broken or loose connection in the low tension wiring is indicated, or the
battery may be exhausted.
Examine the high tension cables,
i.c.,
cables from tl~e coil to the dis-
tributor, and from the distributor to the plugs. If the rubber sbovs signs of
deterioration or cracking, the cable should be renewed. Remove the
distributor moulding and examine the contacts;
if
necessary, clean them as
deect-ibed on page
50.
Turn the engine o\cr by hand, and see that thc contacts
come together.
If a fault is indicated in the low tension wiring, examine the cables from
the switch or junction
hox to coil, and from coil to distributor. See that the
battery terminals are tight and that the cables from the switch-box to the
battery are secure. The battery may be dismissed as the cause of the trouble
if
the lamps will light.
Test the coil independently of the distributor as follows :--Ren~ove the
cable
from the centre distributor terminal, and hold it about :in. from somse
metal part of the chassis and turn the engine. Thme sparking should be strong
and regular
if
the coil is functioning correctly.
Misfiring and Bad Starting.-Examine the high tension cables and the
plugs. If necessary, adjust the gaps to the correct setting (about 20
thousandths of an inch). Sooty or oiled plugs may be dismantled and
washed out with petrol.
The plugs and high tension cables may be tested by removing the plugs
in turn and allowing then1 to rest on the cylinder head and observing whether
D/I
PAGE FIFTY-ONE
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