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  #1  
Old 09-21-2021, 08:21 PM
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05 E320 CDI - stuck, but not broken, glow plug

Any recommendations on how to remove a glow plug that's been unscrewed and is free of the threads but won't pull out of the hole, presumably due to carbon build-up?

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Old 09-21-2021, 09:45 PM
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You can buy or make a split nut that is assembled on the thread portion and held by a wrench to allow you to unscrew it a bit farther. If you can grip it with a slide hammer that should also work.
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Old 09-22-2021, 08:05 AM
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Be careful, the direct injected glow plugs have ceramic tips not steel like the older ones…
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The OM 642/722.9 powered family
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both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

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Old 09-22-2021, 11:54 AM
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http://www.peachparts.com/shopforum/diesel-discussion/351809-gregmns-1991-w126-350sdl-has-new-home.html

Read post #15
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2012 S350 BlueTEC 4Matic
2007 ML 320 CDI
2007 Leisure Travel Serenity
2006 Sprinter 432k
2005 E320 CDI
1998 SLK230 (teal)
1998 SLK230 (silver)
1996 E300D 99k, 30k on WVO
Previous:
1983 240D, on WVO
1982 300D, on WVO
1983 300CD, on WVO
1986 300SDL 237k, 25k on WVO (Deerslayer)
1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix
1983 380 SEC w/603 diesel, 8k on WVO
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Old 09-22-2021, 12:19 PM
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Thanks, GregMN. I wasn't sure what the split nut nelbur referred to was, now I know!
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Old 09-23-2021, 09:57 PM
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Find some way to get Kroil. PB Blaster or some lesser penatrating oil into what space there is around the threads. The object is to try to let is seep into the carbon that has it trapped and possibly dissolve some of it our lube it.
I don't know if it it is possible to create sort of a bowel (with epoxy putty) around the glow plug so that you can fill it up with a pool of penetrating oil. I think that would get a larger amount of the oil inside where it is needed.

Once out sounds like you need a glow plug reamer or some other method to clean the carbon out of the hole.

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