Oh NOOOOO! Stripped ignition coil screws
#1
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Oh NOOOOO! Stripped ignition coil screws
Was working to replace the spark plugs on my 2008 C300 Sport this morning. The screws on the ignition coil were very difficult to remove (don't think the previous owner ever bother to replace the spark plugs) and they are made of somewhat soft metal which is very prone to stripping. Anyway, long story short, I've stripped one of them and another one is not looking good either. Could someone please advise on a plausible solution to remove the stripped screw(s)?
A supposed easy job is now turning into a mess.
But even with just two out of 6 replaced, I can feel the engine feels peppier....which is encouraging.
A supposed easy job is now turning into a mess.
But even with just two out of 6 replaced, I can feel the engine feels peppier....which is encouraging.
#2
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You rounded the head of the screw off? Use a socket for stripped bolts, they have a twisted design inside that cuts in deeper as you try to loosen the bolt so they grip. Will not be able to re-use those bolts but they will come out that way.
You are using the proper size tool on the coil bolts right?
You are using the proper size tool on the coil bolts right?
#4
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They are t30 right? You can use a chisel to turn them loose if you know how if they strip, once they are broken loose they should come right out.
#5
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Thread Starter
Thanks. I got it resolved. What I did is that I bought better T30 driver and applied tons of downward force and quick, impact turn to loosen up the screw. No way I am putting the same screws back in so I am letting two of ignition coils held down by one screw only currently.
Anyone know the correct size for the screw? The width and length? I look up a couple of parts site they don't list it out.
Anyone know the correct size for the screw? The width and length? I look up a couple of parts site they don't list it out.
#7
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'99 and '05 E55 AMG
Part number for the single bolt used to attach the coils on the E-class is A 001-990-72-12. You phrased it in such a way that it sounds as though you have two bolts per coil.
eeuroparts carries the bolts for $1.49 each.
Ebay has them for 99 cents each.
Do a search on Mercedes coil pack screw size.
eeuroparts carries the bolts for $1.49 each.
Ebay has them for 99 cents each.
Do a search on Mercedes coil pack screw size.
Last edited by bbirdwell; 10-29-2018 at 02:41 PM.
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#8
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This?
https://www.ebay.com/itm/1998-2003-M...S!-1:rk:3:pf:1
Hmmm, doesn't look like it. The thread itself may be a fit but the head looks different. Mine is wider and flatter.
https://www.ebay.com/itm/1998-2003-M...S!-1:rk:3:pf:1
Hmmm, doesn't look like it. The thread itself may be a fit but the head looks different. Mine is wider and flatter.
#9
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#10
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![Smilie](https://mbworld.org/forums/images/smilies/smile.gif)
What bothers me is how soft the metal is. Since I don’t expect to ever replace them again so no anti-seize applied. I know one day i may have to eat my own words.