David Brown Cropmaster VAK1 Series, Инструкция по эксплуатации и техническому обслуживанию, Страница: 32 / 51

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·
1
MINOR SERVICE · AND ADJUSTMENTS
FIG.
19
FIG. 18
014
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__
,,,
....
...
,,
13 .,�
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0 �
:
.
,
.
,
..
,
II .... __ _
0
Magneto
Fuel Tap,
Sedi,nent Bowl
and Strainer
.. The sediment howl below
the fuel change-over cock
(Fig. 2) should he taken out
and cleaned as necessary. At
the same time the gauze strainer
may he cleaned as recommended
for the carburettor strainer,
care being taken to replace the
bowl in its original position,
otherwise fuel leakage may
occur. Renew the cork washer
if damaged.
Clean the two contact surfaces carefully and adjust to 0·012 in. This
is done by turning the engine over slowly hy hand until the heel of the
rocker arm is at the extreme height of the cam and slackening the two
screws (see Fig. 13), which enables the fixed contact points to he moved to
obtain the correct clearance. Clean the rotor and make sure-that the carbon
brush in the distributor cap slides freely.
The same instructions apply to the distributor when this is fitted in
conjunction with coil ignition.
Sparl,ing Plugs
These are the detachable type and can be .cleaned easily. All carbon
and soot deposit should he removed. After re-assembly set the spark gap
to 0·030 in. (magneto ignition) or 0·022 in. (coil ignition). Take . care not
to bend the centre electrode. Too frequent dismantling, however, destroys
the sealing faces inside the plug, �reating a danger of leakage, and it is
therefore better to have these cleaned at a service station and to keep a
spare set of cleaned plugs available for an emergency. Always fit sparking
plugs tightly into the cylinder head to avoid leakage, and see that the
copper and asbestos washers are in sound condition. Keep the spanner in
line with the plug when screwing or unscrewing, otherwise the insulation
may crack.
NOTE :
Do not adjust the gap by bending the centre electrode. This
will result in damage to the insulation.
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