46
RUNNING ADJUSTMENTS —
Engine
Sparking Plugs
The sparking plugs were adopted for original equipment after lengthy tests as sparking
plug types vary in suitability for various engines. It is important that the correct type of
plug be fitted when making replacements, this is :
Champion NA8- ¾ "
reach.
The gaps
(i
.e.,
width between the firing point of the centre electrode and the earth point)
are originally set and should be maintained at thirty-two thousandths of an inch (0.8 mm.)
to ensure even running to the engine.
Incorrect gap setting may cause misfiring or erratic slow running. Faulty plug leads or
cracked porcelain insulation in the sparking plug will also cause faulty ignition (see also
page 12).
Sparking plugs should be thoroughly cleaned by a sandblasting process and checked, and
adjusted if necessary, for gap setting after 5,000 miles (8,000 km.) use and at 10,000 miles
or 15,000 km. should be replaced by new plugs.
Summary of Contents for MAYFLOWER 1951
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