Ceramic Glow Plugs, Removing and Installing, Checking

Ceramic Glow Plugs, Removing and Installing, Checking

Special tools, testers and auxiliary items required

• Connector test set (V.A.G 1594 C)

• Voltage tester (V.A.G 1527 B)

• Flex wrench (3220)

Test Conditions

• Engine is cold

• Ignition is switched off

Test Prerequisites

• Battery voltage min. 11.5 V

• Ignition switched off

Test Sequence

Check the electrical activation for the ceramic glow plugs.

- Disconnect the connectors - 1 - from the ceramic glow plugs.





- Connect the lead of the voltage testers (V.A.G 1527B) to battery positive (+) with the adapter clips from the connector test set (V.A.G 1594C).

- Attach the test lead of the voltage tester to each ceramic glow plug in succession.

• LED lights up: Ceramic glow plug OK

• LED does not light up: Replace the ceramic glow plug.

Procedure

CAUTION!
• The ceramic glow plugs => [ Optical Characteristics of
Glow Plugs ] Glow Plugs, are very sensitive to impacts and bending.

• For this reason, do not use sheathed element glow plugs which have dropped (even from a height of approximately 2 cm) under any circumstances, even if no visible damage can be detected.

• Installation instructions must be performed in sequence, otherwise there is a danger the plug breaks and will cause damage to the engine.

• When removing and installing, do not bend the ceramic glow plugs.

- Remove the engine cover and, if present, remove the upper engine noise insulation => [ Engine, Removing ] Engine, Removing.

- Disconnect glow plug connectors from glow plugs.

- Remove ceramic sheathed element glow plugs using flex wrench (3220).

Installation is performed in the reverse order of removal, noting the following:

- Cylinder head bore and thread must be completely cleaned of deposits before installing.

• Never oil or grease thread of bore in cylinder head and ceramic sheathed element glow plugs.

- Screw ceramic sheathed element glow plugs into cylinder head by hand using flex wrench (3220).

- Then tighten ceramic sheathed element glow plugs.

Tightening specification: 15 Nm

CAUTION!
After installing and before first engine start with a cold engine, always perform a resistance test at all ceramic sheathed element glow plugs.

• Specified value: max. 1 ohms

- If specified value is exceeded, replace malfunctioning ceramic sheathed element glow plug.

• If the malfunctioning ceramic sheathed element glow plug is broken, remove all broken pieces from engine, otherwise they can cause damage to engine.