Note. The resistance of one glow plug is 0.6 ohm.
The glow plugs can be removed without disconnecting the high pressure fuel lines.
Removing
Disconnect the glow plug electrical connector.
Clean the area around the glow plugs to prevent dirt from entering the engine cylinders.
Loosen and remove the glow plugs.
To unscrew the spark plug of the 4th cylinder, use a 10 mm long socket with a cardan joint. After loosening the spark plug, completely unscrew it with a piece of hose.
Installation
Installation is made in an order, the return to removal.