Section G5C - Royal Enfield SPRING FRAME O.H.V. 250cc CLIPPER 1954 Workshop Maintenance Manual

ROYAL ENFIELD WORKSHOP MANUAL
For "250 Clipper" late 1955 onwards
1. Headlamp
The headlamp incorporates Lucas Light Unit
MCF.575 (see Fig. 1) which is built into the
Casquette fork head which contains also the
ammeter and the lighting switch.
2. Lucas Light Unit
The unit incorporates a combined reflector
and front lens assembly and includes a parking
light in the main reflector. The main bulb is the
Lucas "prefocus" type the filaments of which are
accurately positioned with respect to the
reflector, thus no focussing device is necessary.
The bulb has a large cap and a flange which
has been accurately positioned in 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.
The construction ensures that the reflector
and lenses are permanently protected, thus the
unit keeps its efficiency over a long period.
In the event of damage to either the lens or
reflector a replacement light unit must be fitted.
3. Replacing the Light Unit and Bulbs
Slacken the securing screw at the bottom of
the headlamp rim. Remove the front rim and
Light Unit assembly.
To change the main bulb withdraw the
adaptor 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.
To change the parking bulb pull the bulb
holder out of the reflector into which it is held
by spring claws formed on it.
To change the entire Light Unit disengage
the springs which secure it to the rim.

SECTION G5c

Lucas Lamps
Replacement bulbs are :-
Main bulb ...
Parking bulb...
Lucas "Prefocus" type 6v.-
30/24 watt Lucas No. 312.
6v.-3 watt M.B.C. Lucas
No. 988.
Section G5c Page 1