D439E Service Manual 3. Engine Electrical System (D439E)
144
Preheating System
Preheating Plug
Inspection
Pre-Heating System Operating Inspection
1. Conditions before inspection : battery voltage is
24 V coolant temperature is below 30°C ( or
perform the test as the coolant temperature
sensor is disconnected)
2. Connect the voltmeter between glow plug plate
and plug body (earth)
3. Turn the Ignition switch ON and read the
voltmeter value.
4. If the pre-heating indication lamp lights for about 6
seconds and indicates battery voltage for about
36 seconds after ignition switch is turned ON, the
system is normal. (When coolant temperature is
20°C)
CAUTION
Time for electric current varies depending on the
coolant temperature.
5. After checking No 3 set the Ignition switch to
START position.
6. If the battery voltage is generated during engine
cranking and for about 6 seconds after start, the
system is normal. (When coolant temperature is
20°C)
Relation Between Glow pug Temperature
(Resistance) and Time For Electric Current.
1. It takes approximately 8 ±1.5 seconds to heat the
glow plug up to 800°C when glow plug is cold with
the battery voltage of DC 23V or more.
2. Apply the battery voltage of DC 23V. After 30
seconds, the temperature should be less than
1050±80°C.
Glow Plug Inspection
1. Check glow plug plate for rust.
2. Check glow plug for any damage.
CAUTION
Do not use the plug if it has been dropped from
the height of 10em or more.
3. Check the resistance between terminal of each
glow plug (NO.1~NO.4) and body.
Reference value : 4Ω
CAUTION
As glow plug resistance is very small, remove
any oil from plug surface before measuring the
resistance.
To Next Page
Loading...
Need help?
General
