Douwe EgbertsEgberts CAFITESSE 300, Руководство по обслуживанию

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Spark Plugs
Chapter 2 Spark Plugs
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[Appearance] Brown deposites on the
insulator directly above the housing.
[Result] No impact on the spark plug
performance.
[Cause] This occurs due to electrical
stress in the air near the insulator. (This
is not a spark plug gas leak, for which it
is sometimes mistaken.)
● Corona stain
8 Comprehensive test
Comprehensive test
From the following statements about spark plugs,
select the incorrect one.
These are high-performance spark plugs that use the world's first ultra-fine 0.4-mm diameter center electrodes.
1
They greatly reduce the required voltage and raise the ignition performance.
2
Thanks to DENSO's unique U-groove ground electrodes, they secure a large volume for flame core formation.
3
The new iridium alloy for the center electrodie improves the oxidation resistance at high temperature.
4
They have longer service life than vehicle manufacturer's genuine iridium spark plugs.
5
When using spark plugs in vehicles which have used normal spark plugs, check in the application table.
6
Select an spark plug with the same heat range as the normal spark plug.
7
Since the required voltage is 3-5 kV, lower than it of normal spark plugs, use with a wider gap.
8
When installing new spark plugs on the engine, the same as for normal spark plugs, turn them in as far as
they will go by hand, then tighten 1/4-1/2 rotation with a spark plug wrench.
9
Answer on next page