Triumph TR4A - Ignition and Charging System

ELECTRICAL
SYSTEM
Ignition
Failure
of
the ignition waming
liSht will
not
Prevent
the
ignition
system
fuactioning
but the
fault should be
rectified at
the first
opportunity.
All
high tension
cables fitted
to the ignition
system are
made
from
carbon
impregnated
nylon or cotton
cords encased
iII
rubber
or neoprene
to form a high
resistive conductor.
Re-
placement
cables
must always
be of the same
tyPe.
Ke€p
the moutded
cover of the distributor
clean
by wiPing
it insid;
and outside
with a soft cloth.
Check that
the carbon
brush
on the
inside moves
freely. The contacts
must
be kePt
free from oil
or dust,
and a gaP maintained
at 0
015".
Ignition
Timing
(Fig.
19)
The nominal
ignition setting
given on
Page
54 aPPlies
to an
engine at
rest.
when
the engine is
running the
i8nition is
adianced
automatically
lo suit
varying conditions
Maximum
performance of an
individual engine
may require slight
modi-
hcation
of the
nominal setting to suit
particular gades
of fuel.
To set the
ignition timing,
rotate the crankshaft
until the
hole in the
crankshaft pulley
flange is aligned
with the
Pointer
on the
timing cover.
With the distributor
point gaP
(7)
set at
0.015"
(0
4
mm.), and
the vemier adjustment set
in the centre
of its scale
(9),
slackeD
the distributor clamP
bolt and adjust
the
distributor
so
that the
conlact
breaker
points arejust commencing
to open.
Tigh(en
the distributor
clamP
bolt
and rolate
the knurled
ver;ier adiustment
screw
(5)
anti-clockwise
unril
one extra
division
appears
on
the
scale.
G€trerator
and Control
Box
The
generator
operates
in coniunction
with the
voltage
requlator"unit
which
is adjacent
to-the
cut-out
in the control
box.
A
fully-charged
battery
receiYes
a low
charginB
currenl
and a dischaieed
biarterv
a high charging
current.
Additionally
the
cut-out
p[uents
the
batteiy
frorn-beiing
discharged
through
rhe generator,
when
the generator
is
not charging.
In lhis event,
the ignition
warning
light glows.
Maintenance
of the
coil
is restricted
to
keePing the terminals
clean and
free from
oil,
The Starter
Motor
The starter
brush
gear
and corffnutator
do
not normally
reouire attention
for aionsiderable
period.
After
48.000 miles.
houever.
it is
advisable to
have the unit
serviced
al a
TriumPh
or Lucas Service
Depot,
If
the starter pinion
jams
in
mesh with
the fl1vheel,
it may
be
released by
switching off
the ignition.
selecting
loP
8ear.-and
rockins
the car
to and fro, or by
removinq
the end
cover
trom
the sta"rter
and turning the
squired
end
-of
the exposed
shaft
in a clockwise
direction,
4T