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B
THE IGNITION SYSTEM
bubbl~.
the
int~nsity
of which will serve
to
indicate
the
degree
of
kalagc.
The
lealc:age gases have a 'blow-
torch'
effec1 when the engine is
running
which rapidly
raises the temperarure of the plug to
above
its
designed
he.ot
ran~;e.
thus
producing overheating. preignotion, and
rapid electrode destruction.
The
top
half
of
the insulator is
frequently responsible
for
poor
plug
performance
due to
the following faults:
splashes. accumulation of
dirt and dust,
cracked
insulators
cau•cd
by
a slipping
spanner, overtighmess
of the terminals.
E•
amine for
a
cracked insulator at the shoulder and
the terminal
post and remove
any accumulations of dirt
and dust.
Section 8.13
N"EW-TYPE
DISTRIBUTOR
A
ocw
di;trihutor
(Part
No. AEJ41), having a roller
w~ight
mKhanism
with a
positive
stop (to prevent over-
ad,•<tncc) and no vacuum
advance
mechanism,
has
been
introduced.
When this
distributor
is
fitted, the
vacuum
adv;oncc pipe must be
removed
and the
u
nion blanked
oiT with blanking
p
lug (Part
No.
AEH
1289).
Instructions for
timing the distributor
are given in
Section 8.7.
Before fitting
a
new distributor the distributor drh-c
'haft gears must be
checked
for backlash
as described
in Section
8.14.
Section
B.
J
4
C'II ECKI
~G
DISTRIBUTOR DRlVE
S
HAFT
BACKLASH
When fitting
a new
distrihtnor
it is most important
that there should be no excessive backlash
in
the distribu-
tor drive
shaft
gears. The backlash
is
checked as follows:
(I)
Fabricate a
))()inter
as
shown
in
Fig.
B.6
and
secure
i1
to a di<used
rotor arm with a nut and bolt.
R.8
(2)
Remove the header
tank
hose to gh-e access to the
distributor.
(3) Lock the automatic
ad,-ancc mechanism
by re-
moving the
cam
retaini11g
screw
and refitting
it
with a washer underneath its
head.
The wash<r
may be made from a piece
of
wire
-Q.JO
in.
(·76
mrn.)
diameter and
I·
! in. (28·57 mm.) long formed into
a circle.
(4)
Fit
the
rotor and pointer to
the
distributor and
ensure
that
the
rotor
is
tight
on
the spindle.
(5)
Rotate the
crank.shafi until the pointer is over the
ftange of the camshaft
cover
(Fig.
8
.6).
(6)
Tum the pointer by hand in an anti-clockwise
direction and mark the
limit of its
travel on the
camshaft cover flange; then
tum
the pointer
clock-..;se, and again mark the
limit
of its traveL
(8) If the d.istaoce bet"een the two
limits
exceeds-& in.
(8
mm.) the distributor dtive gears must be re-
newed
before
a new
di,ltibutor is fitted.
~
1U ,,.,
re't.o.
..
t
I
soT
.
l
r
-
--,--;'
~~,.---------~~09"',
~~~
l
0 jf<~
3S•J>)
/
~
,.
;s·c ,.,o
tA
..
'ft-· • -
· -
;:;s"§os-
>
--==
-··
..
·.,.'f,
----=::::
I
~,!
" .
-:--~
-
- c:=====-=--
..o•
=·
-. --
--
·- -
.
-
~
--g,t
o~(SOto•"l
c:-;;'!:....__ _ _ _ _
-
~
--c
-
'
Fig.
8.6
Clouking the distributor dri>'e
shnft
backlash
MOA
(Twin C..m), !"""
3.
32403
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