Glow Plug: Service and Repair

12 23 505 - Replacing all glow plugs (M57 / M57TU / M47TU / M47T2 / M57T2)





Special tools required:
- 11 6 050 11 6 050 Socket Wrench Socket WAF 10
- 12 2 300 Tools and Equipment






Note:
Read out fault memory of DDE control unit (DDE = Digital Diesel Electronics).

Switch off ignition.

If malfunctions occur at the glow elements, it is absolutely essential to check the fuses behind the glovebox.

For further information on troubleshooting, refer to Diagnosis and Information System (DIS).





Necessary preliminary tasks:
- Disconnect negative battery cable
- Remove intake air manifold Service and Repair





Unlock plug (1) with special tool 12 2 300 Tools and Equipment and detach.





Release glow plugs (1) with special tool 11 6 050 11 6 050 Socket Wrench Socket WAF 10.

Tightening torque 12 23 2AZ [1][2]Glow Plug System.

Note:
If necessary, drill out special tool 11 6 050 11 6 050 Socket Wrench Socket WAF 10 with a 9.5 mm dia. twist drill bit approx. 20 mm deep.





Installation:
Different glow elements in M47 and M47TU engines!

M47 glow elements (1) without designation groove.

M47TU rapid start glow elements (2) with designation groove and silver surface.





Note:
Check stored fault messages.

Now clear the fault memory.