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  #1  
Old 07-15-2021, 04:16 PM
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All 606 glow plugs are out...except for #6

Any tips on how to get that one out w/o cussing so loud the neighbors 2 streets away can hear? lol

2 came out easy, 2 more came loose but were stuck and had to wiggle, ratchet, pull, repeat for a while to get them out where the carbon wanted them to stick in there. #4 I think it is is loose, but was getting too hot and it's probably going to take lots of in/out/wiggling like the others due to being a little stuck with carbon. However, that #6 is going to SUCK due to that oil filter housing being in the way. It's slowing coming a little bit at a time. I've been using a ton of PB Blaster, even squirted a little atf down on the threads to help loosen it up. I do have a magnetic induction heater on its way today to help warm it up and see if that helps...but is there any other way other than deep socket it until the ratchet it up against the oil filter housing, then switch to a wrench?

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  #2  
Old 07-15-2021, 06:49 PM
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Heating will expand it and make it tighter. Heat it, juice it, let it cool, repeat a few times and then let it cool completely. The heating, juicing and cooling will wick the penetrant in a little farther. Patience really pays here.

Some have mentioned using small impact guns on stuck threads, I haven't and don't know if you have access for that anyway.

Good luck!!!
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  #3  
Old 07-15-2021, 07:03 PM
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PB Blaster is garbage IMHO. I've never had good luck with it. Cheap, over-hyped crap.
Get yourself some GOOD penetrating oil. It's not cheap, but worth it's weight. The old adage applies: You get what you pay for. "Kroil" is the "good stuff"! Use it sparingly, exactly where it's needed. Not hosed all over the place. Let it sit, then apply some more.
"Sugar Bear" is absolutely correct: "Patience really pays here". Also correct on the heating/cooling technique. Lots of good info/threads, on Pelican, concerning this task.
You must resist the urge to hurry this along. If it breaks, you'll really be in a world of hurt. Good luck!
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  #4  
Old 07-15-2021, 07:57 PM
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Well, the threads are all out, but just like the others that were tough, the carbon has the body/tip of it stuck. It'll spin all day but is refusing to come out. The induction heater kinda helped me get the threads loose so it didn't break off, but I can't really get any leverage on the tip that the electrical connector connects to so I can wiggle it out like the others. It's getting pretty loose and don't want to break that part off and have something slide down into the head (if It'll even do something like that). I'm done for the night though, I've been battling those damn glow plugs for most of 5 or 6 hours. Hopefully between heat, atf, pb blaster, wd40 and spinning it around, some of that stuff will help dissolve the carbon inside, or at least loosen it up so I can get it out tomorrow.
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  #5  
Old 07-15-2021, 08:01 PM
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You're almost there! The hard part is getting it unthreaded.

Keep breaking down that carbon and eventually it will pull out.
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  #6  
Old 07-16-2021, 12:48 AM
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Quote:
Originally Posted by 123boy View Post
PB Blaster is garbage IMHO. I've never had good luck with it. Cheap, over-hyped crap.
Get yourself some GOOD penetrating oil. It's not cheap, but worth it's weight. The old adage applies: You get what you pay for. "Kroil" is the "good stuff"! Use it sparingly, exactly where it's needed. Not hosed all over the place. Let it sit, then apply some more.
"Sugar Bear" is absolutely correct: "Patience really pays here". Also correct on the heating/cooling technique. Lots of good info/threads, on Pelican, concerning this task.
You must resist the urge to hurry this along. If it breaks, you'll really be in a world of hurt. Good luck!
There is more then one PB Blaster product. One is like WD-40 the other is the penetrant.
I have extensive experience (18 years as a mechanic) with the old school liquid wrench penetrating oils and PB Blaster works significantly better compared to those. Any way that is my personal experience.

What I don't like about the PB Blaster Penetrant is the smell and it does not come with the skinny tube; at least out here it does not. For some reason their other product the WD-40 like PB Blaster comes with the skinny tube.

I would like to try Kroil but it is not sold at local hardware stores.
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Last edited by Diesel911; 07-16-2021 at 12:59 AM.
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  #7  
Old 07-16-2021, 12:52 AM
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Quote:
Originally Posted by Matt300ZXT View Post
Any tips on how to get that one out w/o cussing so loud the neighbors 2 streets away can hear? lol

2 came out easy, 2 more came loose but were stuck and had to wiggle, ratchet, pull, repeat for a while to get them out where the carbon wanted them to stick in there. #4 I think it is is loose, but was getting too hot and it's probably going to take lots of in/out/wiggling like the others due to being a little stuck with carbon. However, that #6 is going to SUCK due to that oil filter housing being in the way. It's slowing coming a little bit at a time. I've been using a ton of PB Blaster, even squirted a little atf down on the threads to help loosen it up. I do have a magnetic induction heater on its way today to help warm it up and see if that helps...but is there any other way other than deep socket it until the ratchet it up against the oil filter housing, then switch to a wrench?
Where there is room for it people have used a combination wrench with a ratchet on the box end (gear wrench) see attached pic. They also have ones where the ratchet end has a flex head.
However, I would not break loose something with the ratchet end as it might be too delicate for that.
Attached Thumbnails
All 606 glow plugs are out...except for #6-gear-wrench.jpg  
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  #8  
Old 07-16-2021, 01:00 AM
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I have not followed the thread closely. Did you get a Glow Plug Reamer or plan some substitute for that to get the carbon out?
Then there is the never-seize type compound for the threads when you install the new plugs.
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  #9  
Old 07-16-2021, 09:47 AM
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I have a reamer on the way along with the plugs from Mercedes Source along with the proper compound...if he'd actually ship them out that is.
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  #10  
Old 07-16-2021, 07:49 PM
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Kroil is hands down the best stuff out there.
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  #11  
Old 07-17-2021, 10:36 AM
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Quote:
Originally Posted by engatwork View Post
Kroil is hands down the best stuff out there.
If they had it locally I would very likely buy some. Until that time it is PB Blaster which is available and reasonably priced.
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  #12  
Old 07-17-2021, 11:21 AM
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I order from their website.
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  #13  
Old 07-17-2021, 06:07 PM
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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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  #14  
Old 07-17-2021, 07:08 PM
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Neat trick. thanx.
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  #15  
Old 07-21-2021, 01:42 PM
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I was thinking of something like that but I don't have the tools or really the space down where #6 was I think. Anywho, I was finally able to get it out today. Had to really heat it up 3 or 4 more times, spray a TON more WD40, PB Blaster, Carb Cleaner, wiggle it back and forth with a wrench, rinse and repeat and FINALLY got it out.

When I put the reamer in there, it pretty much went all the way down with ease. It pulled some crud out with it, but it went in easy. I don't know why that one plug was so damn stubborn. Anyways, the holes are reamed and ready for new plugs to be installed. I'm going to knock out the fuel delivery valve crush washer and o-rings probably later this week and put this car back together. I'm DEFINITELY going to have to change the oil before I start it because of all the fluids I've sprayed down the glow plug holes to loosen them, clean them out, and the carbon that's been knocked loose. It'll give me another reason to use my fancy oil vacuum system I bought for my CL55 so I can change the oil from the top without having to get under this car anymore either

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