ColNel

Hi all,
I want to replace the glow plugs on my 2008 ml320 w164 how would I get to access the glow plugs ? Are there any charts or diagrams to illustrate this available too ?
Thank you in advance

dgiturbo

Warm the engine to operating temp.
Remove the engine cover
Remove the black T shaped air duct that connects between the air filters and the turbo.
Remove the glow plug electrical connectors and unscrew the glow plugs.
DO NOT DROP THE OLD OR NEW GLOW PLUGS. They can hairline fracture very easily.

ColNel

thank you for your reply I'll have a go and let you know how I get on
Cheers

bha

I think there was a maximum torque that you can apply while *removing* the plug. Look on sprinter forums (or any forum that deals with OM642 engines)


It said that if you have to apply more than x ft lbs of torque, you're gonna break the plug. So you set your torque wrench to slightly lower than that amount, and work the plug back and forth till it comes out. There is carbon in the head that jams the glow plug, and you dont' want to break the plug or you can't remove it!


Also as mentioned do this at full operating temperature, NOT COLD otherwise you'll screw up the threads.

ColNel

all done thanks