Rolls-Royce Corniche - Horns (WT 618-Early Cars)-To Adjust; Horns (WT 7 H-Late Cars)-To Test; Horns-To Remove; Windtone Horn WT 618

Rolls- Royce Silver Shadow & Bentley T Series
Workshop Manual
Chapter M
Section MI2
HORNS
The horns are mounted beneath the left-hand front
The mounting for the
WT7H horns is different
O
wing adjacent to the front of the body underframe.
from that used for the
WT618 horns. Replacement of
a pair of
WT618 horns by a pair of WT7H horns will
necessitate a new mounting (refer to the
S$are Parts
Ltst).
Horns-To remove
1. Disconnect the battery.
2.
Disconnect the leads to the horns.
3.
Remove the four %in. A/F setscrews (two per
horn).
4. Carefully remove the horn(s).
Horns (WT 618 - Early cars)-To adjust
No adjustments are provided to alter the pitch of the
horn.
A poor note can be attributed to the condition
of the contact points, insufficiently tightened
mounting brackets or a low voltage at the horns.
To rectify these faults proceed as follows.
1.
Remove the horns as described in Horns
- To
remove.
2. Clean the contact points.
3.
Insert an ammeter in series with the horn, and
test with a voltage of
12 Volts at the horn.
4.
Screw in the adjustable contact (see Fzg. M85)
until the horn just fails to sound.
5. Unscrew half-a-turn and lock.
6. Slight re-adjustment may be necessary to
' tune'
the horn to obtain the correct pitch. The horn should
operate correctly with a minimum voltage of 10 Volts,
at the horn. Remove the ammeter. If the horns still
give a poor note the horn in doubt should be renewed.
Horris (WT 7H - Late cars)-To test
The horns (see Fig. M86 ) are sealed units and the
only maintenance required is adjustment to the
contacts. These adjustments are effected in a similar
FIG. M85 WINDTONE HORN WT 618
manner to those described for the WT618 horns (see
1 Vibrating contact
0 Fig.M85). 2 Adjustable contact