ELECTRICAL EQUIPMENT
(iii)
Steel
push
rod stiff or jammed
in its bush. Remove the contact
breaker spring and work the push
rod up and down to ease it. If
necessary, clean the rod and bush
with petrol to remove any ac-
cumulations of dirt or grease. The
exposed portion of the rod should
be smeared with a fairly thin
grease
(Duckham's H.B.B., or its
equivalent), which will work down
into the bush when the horn is
blown.
(iv)
Push
rod too slack,
causing
rattle when the horn is blown.
This will be due to the push rod
having
run
dry of grease, with
consequent excessive wear.
A
new push rod must b; fitted. If,
due to wear of the bush, the new
push rod is also slack, no repair is
possible and the horn must be
replaced.
(v)
Armature fouling base plate.
There should be a clearance of
approximately .020n between the
armature and the base plate. If
the armature touches the base
plate at any point, slacken the six
screws securing the base plate and
move the armature
until
it is cen-
trally placed in the aperture.
It
is advisable to fit shims round the
armature to hold it central while
the securing screws are tightened.
(c)
Both Horns Fail to Operate
Examine the fuse protecting the horn
circuit. If it has blown, examine the
wiring and horns for evidence of a
short circuit. Renew any damaged
leads, covering them with extra pro-
tective sleeving
if
necessary, and fit a
new fuse into position.
If the fuse still blows, it is possible that
the adjustment of one or both horns is
badly out, and that as a result the
current consumption is very greatly
increased.
(d)
One
Horn
Fails
to
Operate
Disconnect one lead from the terminal
block of the second horn, taking care
that it is not allowed to touch any part
of the car.
Remove the cover of the faulty horn
and examine the movement for the
faults enumerated in Para.
(b).
,
,
Pay particular attention to the internal
wiring of the horn, which may have
broken or become unsoldered as a
result of vibration, and see that chafed
insulation does not cause a partial or
complete short circuit.
Note-All
joints in the internal wiring
of the horn must be firmly soldered
using a non-corrosive
flux.
(i) If the horns are removed for bench
testing or adjusment,
it
is ad-
visable to carry out an insulation
test before replacement, testing
between each
terminal and the
body
with
a 500-volt test set or
similar equipment.
(ii)
Under no circumstances must the
movement be dismantled. If,
after
carrying out the above testing
procedure, the fault has not been
located, a new horn must be
fitted.
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