FML: CRD #6 Glow Plug - JeepForum.com
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post #1 of 9 Old 01-23-2019, 03:21 PM Thread Starter
KUJeeper82
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FML: CRD #6 Glow Plug

It's stuck. Not a thread issue, but carbon buildup not allowing it to come free completely. I even did a cylinder compression check and it pushed the thing out about 1" from the head showing all the threads, but I can't pull it free. After battling with it for an hour, I hit it with some more PB Blaster and am calling it a day.

Is this something you just have to keep throwing penetrating oil at until it comes out?

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post #2 of 9 Old 01-23-2019, 06:15 PM
underscore
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Maybe try getting some carb cleaner down there? I think that's what Chirpz mentioned in his injector seal write-up, it melts diesel buildup like warm butter.

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post #3 of 9 Old 01-24-2019, 07:36 PM
Tetto
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I had the same thing happen on a few of my glow plugs last winter. I was afraid of breaking them off if I muscled them on my own, so I took it to a shop. They told me they just hit them with a blow torch and work them out. 2 came out but apparently 1 broke so they had to extract it.

TLDR: heat, apparently.
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post #4 of 9 Old 01-25-2019, 02:42 PM Thread Starter
KUJeeper82
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Success! I warmed the jeep up again and used the compression to pop it part way out then hit it with carb cleaner as suggested. Did this about 3 times and eventually was able to pry it out with needle nosed pliers. Doesnt look like the jeep dealership used any anti-seize on this thing... huh.
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post #5 of 9 Old 01-27-2019, 12:29 PM
fuzzynumbskull
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Recommend using a carbon reaming tool before you reinsert, like this https://mercedessource.com/store/hea...-plug-chambers
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post #6 of 9 Old 01-29-2019, 01:44 PM
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Glad you got this sorted out. Curious if anyone on here has used Kroil before. It's supposed to be like a miracle penetrating oil but I havent gotten around to buying any yet.
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post #7 of 9 Old 01-30-2019, 04:06 PM
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Kroil is great. Used it a lot at work on exhaust parts and broken bolts. There's also an A/C Delco Rust Penetrant that I used some but everyone swears by Kroil.

One of my techs had to remove some combustion transducers from the glowplug sockets on an engine that had run 3000+ hrs. He soaked these metal combustion adapters in Kroil twice a day and hit them with a slide hammer twice a day. After two weeks, we got all 4 transducers and adapters out clean.
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post #8 of 9 Old 03-25-2019, 05:33 PM
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I had a serious issue with carbon build up as I waited far too long to remove my DPF. 5/6 broke with no one wanting to even look at it for under $3,000 to start. I bought a removal tool which was a waste of $$$ as there isn't enough material inside the plug to tap. The extractor just pulled up like it was installed in mush. I drilled out the threaded portion in the head and used a small screwdriver to "fold" over the top of the plug and sprayed in a Seafoam penetrating fluid. After a few weeks of driving I popped three out, and after a few months the last two.

Warning! These things will blow through the hood! (no, it didn't happen to me). I rolled up some rubber matting to absorb the "bullet".

I'm guessing you won't find this method in any manual.
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post #9 of 9 Old 03-25-2019, 11:15 PM
terrasmak
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Not looking forward to this, I have 2 bad and 1 confirmed snapped at the threads.

On a different not, got a code for the #8 glowplug bad, after a short search I gave up on finding it.

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