202k Miles W210 Stuck Glowplug - Page 3 - PeachParts Mercedes-Benz Forum

Bajaman · #31 05-08-2008, 12:07 PM

I'm not really up on this glow plug issue, but did you try turning it back in? Usually turning in and out frees up carbon and what not. This is probably a given, but wasn't sure if you tried this.

nhdoc · #32 05-08-2008, 12:30 PM

Quote:

Originally Posted by pat201

I finally was able to remove the starter + the oil filter housing. I also removed the spinning broken hex faces. Then I start drilling the glowplug main shaft. By the way after removing the hex there is a clearence of about 0.5 mm or so between the GP shaft and the threaded portion of the GP. I also tried to unsuccessfully mig weld onto the GP threaded portion a nut. Not able to do the area to small for the mig welder to work.
Now I have 2 choices: using an extractor (screwing it counterclock wise) or a puller. Which one do you believe will be more successful? See the attached picture showing a macro picture of the GP.

You can only pull or extract it if you are 100% sure the threaded part is all the way out. From your photo that is not clear, in other words you still may have some threads engaged. If that is the case then you need to drill out the threaded part, or unthread it all the way if possible by turning it before you can extract the rest of the GP, I would think. Once it is unthreaded I would use an extractor rather than a puller.

pat201 · #33 05-08-2008, 12:38 PM

Yes, I went back an forth with GP. I was able to unscrew it 50% (that is about 4 threads of the total 8 it has. Then it got stuck and it broke the hex faces from the threaded area.
I still have engaged 4 threads. To take it out I believe I have 2 options as I said: to pull it or to extract it. If I will use a puller I will most likely damage 4 remaing threads in the head. If I use an extractor which turns in the opening direction can I unscrew the GP?

nhdoc · #34 05-08-2008, 12:45 PM

Quote:

Originally Posted by pat201

Yes, I went back an forth with GP. I was able to unscrew it 50% (that is about 4 threads of the total 8 it has. Then it got stuck and it broke the hex faces from the threaded area.
I still have engaged 4 threads. To take it out I believe I have 2 options as I said: to pull it or to extract it. If I will use a puller I will most likely damage 4 remaing threads in the head. If I use an extractor which turns in the opening direction can I unscrew the GP?

That being the case, then I would only use an extractor and one which engages CCW, like an easy out that would allow you to turn it as you engaged it but before you started extracting. I would not want to damage any of the threads by just ripping out the plug...I think that would be an unwise way to proceed.

TMAllison · #35 05-08-2008, 01:13 PM

You obviously can't pull it while it's still screwed in.

Take an old one, bust teh head off, stick it in the vise and practice drilling and then using the easy out before tackling the one thats stuck.

pimpernell · #36 05-08-2008, 01:36 PM

Quote:

Originally Posted by pat201

I finally was able to remove the starter + the oil filter housing. I also removed the spinning broken hex faces. Then I start drilling the glowplug main shaft. By the way after removing the hex there is a clearence of about 0.5 mm or so between the GP shaft and the threaded portion of the GP. I also tried to unsuccessfully mig weld onto the GP threaded portion a nut. Not able to do the area to small for the mig welder to work.
Now I have 2 choices: using an extractor (screwing it counterclock wise) or a puller. Which one do you believe will be more successful? See the attached picture showing a macro picture of the GP.

From your picture, it is hard to get a good idea of exactly how much is sticking out , but it looks like you have enough to use a tool that is designed to work on a rounded off bolt. I have provided a link to Northern tool....it might give you another idea on how to get this plug out...Best of luck to you!!

http://www.northerntool.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=6970&productId=200263374&R=200263374&cm_ven=TL&cm_cat=ERK&cm_pla=Yahoo&cm_ite=Hand%20Tools

pat201 · #37 05-08-2008, 02:00 PM

I tried the Irwin tool - I was able to unplug the GP by 50% (4 flights out of 8). Then it broke.
Now that is broken I drilled the shaft out about 2-3 cm (about 1 inch) and I using an extractor CCW I reach torques exceeding 50Nm. I am afraid I will break the extractor (I am using number 3 by Craftsman). What should be maximum torque to try - by the way I soaked GP with Kroil + PB. Did not turn at all.

TMAllison · #38 05-08-2008, 02:05 PM

Are the other plugs installed so that you can fire it up to operating temp and then freeze the bad plug a few times to allow expansion and contraction help loosen it?

rrgrassi · #39 05-08-2008, 02:11 PM

If nothing is working, it may be time to remove the head and take it to a machine shop.

pat201 · #40 05-08-2008, 02:34 PM

I can not start the car without the oil filter and starter.
It looks like I have to take the head off.

vstech · #41 05-08-2008, 02:41 PM

WAIT!!!
before you go and pull the head, get a small bolt and put it in the hole, and weld it in the hole, then weld a nut onto that small bolt as close to the GP as possible. the heat from the welding will dramatically help you get the plug out.
another thing you can do is spray some PB blaster into the PC through the injector opening, and let it sit for a few days, then spin the motor over to get the gunk loosened by the blaster out of the pot. then put in some Marvel mystery oil in there. let it sit for a few days, spin over to spray it out, then put in some acetone and let it sit for a day. after all that try the welder/bolt/nut trick...

spock505 · #42 05-08-2008, 03:09 PM

Quote:

Originally Posted by pat201

I can not start the car without the oil filter and starter.
It looks like I have to take the head off.

Its not as bad as it seems and wont do it any harm with 200k on the clock, gives a chance to get rid of any build up and spot signs of ware-

If you go down the drill route I would mock up a guide for the drill using the empty glow plug ports - this is how its done in the machine shop to get the correct angle, then they just move the head along and centre on the core -

I have seen attachments which go on standard power drills which can be set as a stop to avoid drilling too far - not sure if you could adapt this for the above application.

Best of luck,

David

TMAllison · #43 05-08-2008, 03:12 PM

Quote:

Originally Posted by pat201

I can not start the car without the oil filter and starter.
It looks like I have to take the head off.

Sorry, forgot you had the oil filter housing off.

Along VSTECH's idea can you tap the inside hole and put a bolt inside it with jam nuts? Or, put a 12.5mm(?) nut over the outside of the GP threads and tack weld the two together?

I don't think you move to "head off" until you've actually broken something; at this point it's still just stuck, buggered up and almost out.

nhdoc · #44 05-08-2008, 03:16 PM

I'm with Terry...don't quit and resort to removing the head until that is your only choice. If you tap the GP with a LH tap and get a LH threaded bolt you might just be able to unthread it...that's easier than pulling the head.

vstech · #45 05-08-2008, 03:34 PM

I think your first step from here is to get some additives on the other side of that glow plug and clean up whatever is binding it in the head. namely carbon. rotate the motor so the piston is at TDC for that bore, to minimise the amount of cleaner you need, and minimise the washing of the cylinder. then start choosing cleaners to put in there, use compressed air to swash it around in there. (use a good face shield, and lots of rags, and a plastic poncho on yourself, and some good rubber gloves... have fun.