Location of the glow plug on a turbocharged diesel engine
Examination
1. Connect a voltmeter between the glow plug supply rail and ground. Turn on the ignition and check that the voltage is supplied to the candles at the appropriate time. The time to energize the glow plugs increases at lower temperatures and decreases as the temperature rises. If voltage is applied to the glow plugs, then the relay and electrical wiring are good.
2. To check the serviceability of the glow plug, disconnect the voltage supply bus from it. Using a tester, check the resistance between the contact at the top of the spark plug and the spark plug body. The resistance of the glow plug is 1.5 ohms and if the tester shows more resistance, the glow plug is bad.
3. If you have an ammeter that measures high currents, connect it between the supply rail and the top contact of the glow plug. Apply voltage to the glow plug and measure the current drawn by the glow plug. If the current drawn by the plug exceeds 15A, then the glow plug is faulty.
Removing
Elements for connecting the supply rail to the glow plug
1 - nut; 2 - supply bus; 3 - glow plug
Location of the glow plug on a non-turbo diesel engine
1. Remove the ground wire from the battery.
2. Unscrew the nut and remove the feed bar from the top of the glow plug (see fig. Elements for connecting the supply rail to the glow plug).
3. Unscrew the glow plug from the cylinder head (see fig. Location of the glow plug on a non-turbo diesel engine).
Checking glow plugs removed from the engine
1. Check each glow plug for mechanical damage. Burnt or shattered glow plug tips can be from poor injector atomization. If there is such damage, the fuel injectors must be checked and, if necessary, replaced.
2. If the glow plugs are not mechanically damaged, check their electrical resistance, which should be less than 1.5 ohms.
3. Glow plugs can be tested by applying 12 volts to them. At the same time, they must be heated evenly and for the required time interval. In doing so, the following precautions must be observed:
- Hold the glow plug with a special clamp or pliers.
- The electrical supply circuit of the glow plug must have a fuse.
- After checking, the glow plug should cool down for a few minutes.
4. A glow plug in good condition heats up to a reddish burner within 5 seconds. With a longer heating or heating in the middle part, and not at the end of the candle, the candle is faulty and must be replaced.
Installation
1. Installation is made in sequence, return to removal. In this case, the threaded part of the glow plug must be lubricated with a copper-based non-stick composition.