Triumph TR4 - ELECTRICAL SYSTEM - IGNITION TIMING; Setting Ignition Timing

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ELECTRICAL
SYSTEM
Igrlition
Failure
of
the ignition
warning
light
will not
Prevent
lhe
ignition
system
func-rioning
but
th; tault
should
be rectifed
at
the
fiIst opportunity.
All high
tension
cables
fitted to
the ignition
system
are made
from
carbon
impregnated
nylon
or cotton
cords
encasecl
rn
rubber
or
neopr-ne
to form
a high
resistive conductor.
Re-
placement
cables
must always
be of
the same
tyPe.
Keep the
moulded
cover of
the distributor
clean
by
wiPing
iL inside 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
0'014'
to 0 016"'
Ignition
Timing
(Fig.
27)
The
nominal
ignition setting
given on
page
58_apPlies.to
an
engine
at rest.
When
the engine
is runnlng
the lgnltlon
N
adianced
automaticallY
to suit
varying conditions.
Maximum
performance
of
an in<liridual
engine
may require
slight
modi-
hcation
of
the nominal
setling
to suit particular
grades
o[ fuel.
To set
the ignition
timing,
rotate
the cmnkshaft
until
the
hole
in
the cmnkshaft
pulley
flange
is aligned
with the
Pointer
on the
timing
corer.
With the
distributor
Point
8aP
(7)
set
at
0.015'
(0
4 mm.).
and
the
vernier
adjustment
set
in the
centre
of its scale
(9),
slacken the
distributoiclamp
bolt
and
adjust the
42
distribulor
so that
the
conlact
breaker
points are
just
commencing
ro oDen.
Tighten
t he
disl
ribu lor
clam
p bolt and
rolate
the knurled
vernier
adiustment
screw
(5)
anri-clockwise
uotil
one
extra
division
ap"pears
on
the scale.
One
division
is equal to
4'ignition
advance
(liankshaft angle).
Generator
and Control
Box
The
generator
operates
in coniuncrion
witb lhe
voltage
rezulator'unit
which'is
adiac€nt
to the
cut-out
in the
conlrol
b&.
A fu
v-charged
bartiry
receives
a low
charging
current
and
a discharged
b'attery
a
high
charging
currenr'
Additionally
Lhe
cut-out
prevents
the battery
from berng
dlschargeo
mrougn
the
generator.
when
the
generator
is not
charging.
In this
event.
the
ignition
warning
light
glows.
Maintenanca
of the
coil
is
restlicted
to keoping
the terminals
clean
and
free
from
oil.
The
Starter
Motor
The starter
brush
gear
and
commutator
do not
normally
reouire
attention
for a ionsiderable
period. After 48.000
miles.
ho'wever,
it is advisable
to
have the
unit
serviced
at a Triumph
or
Lucas Service
DePot.
If
tlle starter
pinion
iams
in mesh
with
the flywheel,
it may
be
released
by switthing
6ff
the
jgnirion.
selecting
toP gear,^and
rockins
the car
to
and fro,
or
by removlng
the end
cover lrom
the sta-rter
and
turning
lhe
squared
end
of the
exPosed
shatt
in a clockwise
direction.