Royal Enfield CONSTELLATION 1958, Руководство по техническому обслуживанию мастерской

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2 (b). Adjustments
Check every 3,000 miles.
(i) Setting contact breaker gap. The contact
breaker gap must be set to 0.012-0.015 in. when
the contacts are fully separated.
To adjust the gap, turn the engine until the
contacts are fully opened. On K2F (42369) type
magnetos the locking nut of the adjustable
contact must first be slackened. Turn the contact
by its hexagon head until a feeler gauge of
appropriate thickness is a sliding fit in the gap.
Tighten the locknut and recheck the gap. On
K2F (42369B) type magnetos the cheese-headed
screw which locates the spring anchor plate is
slackened; the plate on which the contact is
mounted may then be moved away from or
towards the contact breaker arm, to give the
required clearance.
(ii) Adjusting the Timing Control Cable.
Slackness in the manual control timing can be
taken up by sliding the waterproofing rubber
shroud
up the cable and turning the
hexagon-headed cable adjuster. After adjusting,
return the rubber shroud to its original position
over the adjuster and control barrel.
2 (c). Cleaning
To be carried out every 6,000 miles.
Check the contact breaker contacts and, if
necessary, clean them as described in Subsection
2(a). Wipe the outside of the magneto to remove
dirt or grease. Check the cable adjuster and
control barrel for signs of water ingress.
Remove the high tension pick-ups and polish
with a soft dry cloth. Each carbon brush must
move freely in its holder and, if necessary, clean
it with a petrol-moistened cloth. Should a brush
be worn to within
1
/
8
in. of the shoulder it must
be renewed.
Whilst the pick-up moulding is removed,
clean the slip ring track and flanges by holding a
soft dry cloth against them with a suitably
shaped piece of wood while the engine is slowly
turned.
The high tension cables must be kept clean
and dry.
2 (d). Renewing High Tension Cables
If, on inspection, the high tension cable
shows signs of deterioration, it must be
replaced, using 7mm. rubber, P.V.C. or
neoprene covered ignition cable. To fit a new
high tension cable, bare the end for about
3
/
8
in.,
thread the knurled moulded nut over the cable,
and thread the bared cable through the washer
removed from the old cable.
Bend back the strands radially, and screw the
nut into the pick-up moulding.
2 (e). Renewing Timing Control Cable
The timing control cable should be renewed
if it becomes frayed, otherwise moisture may
enter the contact breaker housing.
To do this, slip back the rubber shroud and,
by means of the hexagon at the base, unscrew
the control barrel. If the cable and the plunger to
which it is attached are now pulled upwards, the
cable nipple can be disengaged from the plunger
slot.
Soften the solder and remove the nipple.
Thread the new length of cable through the
rubber shroud, cable adjuster, control barrel,
sealing washer and restoring spring. Solder the
nipple to the end of the cable. Engage the nipple
with the slot in the plunger and screw the
control barrel into the body, ensuring that the
sealing washer is correctly fitted between the
barrel and the body. Take up any slackness in
the cable by means of the adjuster before
refitting the rubber shroud in position.
2 (f). Contact Breaker Springs
Correct contact breaker spring pressure
measured at the contacts is 18-24 oz.
3. Servicing
3 (a). Testing Magneto in Position on Engine
To locate cause of misfiring or failure of
ignition, check as follows
(i) Remove the sparking plugs from the
engine. Hold the end of the H.T. cable about
1
/
8
in. from the cylinder block and crank the engine.
If strong and regular sparking is produced the
fault lies with the sparking plug or plugs which
must be cleaned and adjusted or renewed.
(ii) If no sparking is produced, examine the
H.T. cable and, if necessary, renew it as
described above in Subsection 2 (d).
(iii) Very occasionally, the fault may be due
to a cracked or punctured pick-up moulding.
This type of fault is not easily detected by
inspection, and a check should therefore be
made-by substitution.
(iv) If the ignition cut out switch is
suspected, disconnect the cable at the magneto
and retest. If the magneto now functions
normally, the fault is in either the cable or the
cut out switch. Correct by replacement.
(v) If the magneto has recently been replaced
or removed, it may be incorrectly timed. Refer
to the engine makers' instructions, and check.
(vi) Check the contact breaker for cleanliness
and correct contact setting as described under
Maintenance.
If the cause of faulty operation cannot be
traced from the foregoing checks, the cause may
be an internal defect in the magneto. The
magneto should therefore be removed from the
engine for dismantling.
Further ignition particulars are given in a
booklet issued by the makers, a copy of which
we shall be pleased to forward upon request.
Section G1f Page 2
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