Section G5D - Royal Enfield 350 BULLET 1956 Workshop Maintenance Manual

ROYAL ENFIELD WORKSHOP MANUAL
1. Headlamp
In all models the headlamp incorporates the
Lucas Light Unit MCF 700 built into the
Casquette fork head which also contains twin
parking lamps as well as the ammeter and
headlight switch.
2. Lucas Light Unit
The unit incorporates a combined reflector
and front lens assembly (see Fig. 1). This
construction ensures that the reflector and lenses
are permanently protected, thus the unit keeps its
high efficiency over
"prefocus"bulb is used, the filaments of which
are accurately positioned with respect to the
reflector, thus no focusing device is necessary.
The bulb has a large cap and a flange, which
has been accurately positioned with relation to
the bulb filaments during manufacture. A slot in
the flange engages with a projection on the inside
of the bulb holder positioned at the back of the
reflector.
A bayonet-fitting adaptor with spring-loaded
contacts secures the bulb firmly in position and
carries the supply to the bulb contacts.
The outer surface of the lens is smooth to
facilitate cleaning. The inner surface is formed
of a series of lenses which determine the spread
and pattern of the light beams.
In the event of damage to either the lens or
the reflector a replacement light unit must be
fitted.

SECTION G5d

Head and Tail Lamps
a long period. A
3. Replacing the Light Unit and Bulb
Slacken the securing screw at the top of the
headlamp rim. Remove the front rim and Light
Unit assembly.
Withdraw the adaptor from the Light Unit by
twisting it in an anti-clockwise direction and
pulling it off. Remove the bulb from its locating
sleeve at the rear of the reflector.
Disengage the Light Unit securing springs
from the rim and lift out the Light Unit.
Position the new unit in the rim so that the
word "TOP" on the lens is correctly located when
the assembly is mounted on the headlamp. Refit
the securing springs ensuring that they are equally
spaced around the rim.
Replace the bulb and adaptor. The bulb must
be the Lucas "prefocus" type-6 v. 30/24 watt
Lucas No. 312.
Locate the bottom of the Light Unit and front
rim assembly in the headlamp shell or in the fixing
rim attached to the Casquette fork head. Press the
front on and tighten the securing screw at the top
of the headlamp.
4. Parking Lights
Access to the parking bulbs is obtained by
removing the parking lamp rim (see Fig. 2). This is
forced over the edge of the rubber lamp body and
is additionally secured by means of a small fixing
Section G5d Page 1