Norton 19S - Page 32

carborundum stone or emery cloth and after-
wards wipe with cloth moistened with petrol.
(Para. 92). Occasionally check contact
breaker
opening (using gauge on ignition
spanner). (Para. 91) .
Replace high-tension cable if it becomes
wom or perished.
Head Lamp. Focus head lamp after fitting
new bulb. (Para. 101).
Ignition
90. LUBRICATION.
The cam is lubricated by a wick, contained
in the contact breaker base, which must be
given a few drops of thin machine oil about
every 2,500 miles.
To get at the wick, remove the spring arm
carrying the moving contact and withdraw the
screw carrying the wick. (Fig. 21)
When replacing the contact breaker com-
ponents sec that the small backing spring is
fitted immediately under the securing screw
and spring washer, and that the bent portion
faces outwards.
CONTACTS
CONTACT
BREAKER
~ECURINC SCRtW
SCREW CARRYING
LUBRICATION WICK .. \
~~\'l\"
SCRtW SECURING
CONTACT BREAKER~ . ~~--
SPRING
Pig. 21
91. CONTACT BREAKER-
AD)USTMENT.
After dismantling the contact breaker in
order to lubricate, the contact setting should
be checked.
Turn the engine until the contacts are fully
opened and insert the gauge provided, .010
inch-.012 inch thickness, between the
contacts.
The gauge should be a sliding fit.
If there is an appreciable variation from the
gaug~
slacken the lock nut and the conta~t
sere\\ by its hexagon head until the gap 1s
set to the gauge.
Tighten the lock nut
92. CONTACT BREAKER-CLEANING.
Remove the contact breaker cover and
examine the contacts.
32
If they are dirty, they must be cleaned by
polishing with a very fine carborundum stone
or very fine emery cloth; afterwards wipe away
any dirt or metal dust with a petrol-moistened
cloth.
Qeaning of the contacts is made easier if
the spring arm carrying the moving contact
is removed as described in paragraph 90.
Examine the spring arm of the contact
breaker and wipe away any rust.
Adjust as described in paragraph 91.
93. H.T. CABLE.
Should be 7 m/m. in diameter, rubber
covered ignition cable.
The cable must be replaced if the rubber
insulation has perished or shows cracks and
becomes brittle.
Pig. 22
To fit the new cable to the pick-up terminal,
thread the knurled moulded nut over the lead,
bare the cable for about ¼ inch, thread the
wire through the metal washer removed from
the old cable and bend back the strands.
Finally, screw the nut into its terminal.
94. PICK-UP.
Examine the pick-up or high tension terminal
(magneto end).
Sec that the carbon brush moves freely in
its holder: being careful not to stretch the
brush
spring unduly.
While the pick-up is removed, clean the
slip ring track. and fl~ges by h~lding a soft
cloth on the ring while the engine is slowly
turned by hand.
95. SPARKING PLUG.
Clean periodically by dismantling and re-
moving all the carbo? from the electrodes.
Scrape inside of plug body clean of carbon
re-assemble and set gap at .018"-.
022
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