Villiers MARK 12D, Operating Instructions And Spare Parts List

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points commence to open. Tighten up flywheel nut sufficiently to
turn crankshaft, rotate until piston is at top of stroke, then timing
marks should be opposite one another. Finally, tighten up centr!'
nut with the hammer-tight spanner, and refit flywheel cover.
Contact
This is
of the latest type requmng a screwdriver only
to
Breaker
adjust the contact points. To adjust the contact points
Assembly. proceed
as
follows:-
Turn flywheel clockwise until rocker pad is on top of earn
profile of flywheel boss. Release the screw
"A"
(see illustration
below). Position bracket
"B"
by turning adjuster cam
"C"
until
.
0
1
5
"
feeler gauge can be inserted between the contact points.
Tighten screw
"A"
and withdraw feeler gauge. It is not necessary
to disturb nut
"D"
when adjusting point gap.
A
felt pad is used to keep the cam in a slightly oily condition , and
is impregnated with grease when new.
This
can, if visibly dry, be
oiled with a small amount of the heaviest oil available. It is better,
however, to soak the pad in a molten high temperature grease if it
is convenient to detach the box itself for this operation. If too much
oil is put on the felt pad it may creep along the Rocker
Arm,
get on
the contact points, and so cause ignition trouble.
Fill(.
2.
CONTACT BREAKER ASSEMBLY.
CARBURETTERS.
The carburetterfitted to the Mark
12D
engine is the Type
S.19,
and for the Mark
SE, Type
S.24,
or the later Type
S.25.
In all carburetters the position of taper needle in relation to the
throttle is adjustable
b
y means of the special screw situated in
centre at top of throttle. This adjustment is provided Jo suit
individual engines, and it should not be necessary to alter the
makers setting except after considerable mileage. The standard
setting from throttle to end of taper needle is, Mark
12D.
2.015
inches, Mark
SE. 1.95
inches.
6