The classification & characteristics of glow plugs
In view of the construction, there are two types of the glow plugs;
one is coil type where the heating coil is exposed by the heat resistance pipe(sheath).
By the 1970s, the coil type was the main, but the
sheath type is now the most popular taken over all the other types of glow plugs.
More ever, the sheath type is divied into three groups for the heating time as following types.

Standard type To 800'C after 20-25 sec
the resistance of the heating coil does not
vary from temperature, and the glow plug
draws the constant current.



Quicktype To 800'C after 15-20 sec
The coil resistance increases as the
temperature goes up, and the current is
almost double of the nominal current
when the glow is engaged, and this makes
possible to heat up quickly.
OGS type To 900'C after approx. 10 sec
The electronics controller and relays control
the engaged time and current draw for the
quick starting, and also stable running of
engine and reduction of smoke at cranking.

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