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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications Stripped Cylinder head changing Spark plug help
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      07-10-2019, 02:04 PM   #1
jonobro
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Stripped Cylinder head changing Spark plug help

I stripped cylinder head 5 changing my spark plugs.. I know I'm an idiot for it does anyone know what I should do to fix ? I bought a HeliCoil repair kit but I have no experience on how to do it myself..

If I take it to a Indy shop they will try to get as much money out of me in which I can't afford..
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      07-10-2019, 03:48 PM   #2
doodlebro
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Pretty sure you need to remove the head to do any work, a helicoil will create tons of metal flakes that you don't want getting into the combustion chamber. How did you strip it exactly? Crossthreaded?
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      07-10-2019, 05:19 PM   #3
trialmountain
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Bluntly, sounds like you are in over your head.

An independent shop may be the best course of action with experience in correcting a delicate situation.
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      07-10-2019, 06:29 PM   #4
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IMHO, you're screwed. You'll need this professionally corrected.
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      07-10-2019, 07:10 PM   #5
wcr3d
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To do a helicoil you drill out the threads, retap, insert coil, break off end.
All sizes and threads in compliance with coil chart.
That being said, I agree with the above, pay the money.
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      07-10-2019, 09:02 PM   #6
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Quote:
Originally Posted by wcr3d View Post
To do a helicoil you drill out the threads, retap, insert coil, break off end.....
Which will introduce metal shavings into the cylinder chamber. The head has to be removed to do the job cleanly and safely.

How much is a new head? That would reduce your down-time.
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      07-10-2019, 10:12 PM   #7
wcr3d
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Oh absolutely but I didn't want to get into the long version.
So yes, totally agree.
To the OP, do you realize the head is aluminum also?
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      07-10-2019, 11:04 PM   #8
ziekxq
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Maybe this might help you if you want to take the head off your self:

https://www.e90post.com/forums/showthread.php?t=1348442
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      07-11-2019, 02:45 PM   #9
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Head doesnt have to be removed, been there done that with a 4V 4.6 DOHC engine. Stripped the spark thread doing a spark plug change, had it towed to a shop, took them 2-3 hours to heli coil it and never had any issues. Definitely take it to a professional shop to avoid any additional damage. I rememeber they said they put red lock tight on the outter side of the helicoil before threading it in too.
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      07-11-2019, 05:28 PM   #10
wcr3d
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No one said it HAD to be removed just highly recommended.
Miss just a few shavings and you can ruin the whole motor.
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      07-14-2019, 09:30 AM   #11
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Repairing threads on a cylinder head while installed on the engine is very very very difficult to do on a modern BMW direct injection head as the spark plug bore is very narrow AND not straight in. Any cutting and installing tools are not going to be able to tackle the repair from the installation side. It must come in from the chamber.

The only way a reliable repair is going to occur is with the cylinder head off of the engine. You are going to have a professional correct it, and it is going to be a lot more than what it would have been to let them carry out the spark plug service correctly to begin with.

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      07-14-2019, 01:18 PM   #12
jonobro
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Quote:
Originally Posted by Stück View Post
Repairing threads on a cylinder head while installed on the engine is very very very difficult to do on a modern BMW direct injection head as the spark plug bore is very narrow AND not straight in. Any cutting and installing tools are not going to be able to tackle the repair from the installation side. It must come in from the chamber.

The only way a reliable repair is going to occur is with the cylinder head off of the engine. You are going to have a professional correct it, and it is going to be a lot more than what it would have been to let them carry out the spark plug service correctly to begin with.

You can't be saying that
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      07-14-2019, 03:21 PM   #13
ezaircon4jc
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Quote:
Originally Posted by Stück View Post
Repairing threads on a cylinder head while installed on the engine is very very very difficult to do on a modern BMW direct injection head as the spark plug bore is very narrow AND not straight in. Any cutting and installing tools are not going to be able to tackle the repair from the installation side. It must come in from the chamber.

The only way a reliable repair is going to occur is with the cylinder head off of the engine. You are going to have a professional correct it, and it is going to be a lot more than what it would have been to let them carry out the spark plug service correctly to begin with.

OUCH!!!

So that demands the question... What's less expensive, a new empty/used head or fixing the current head?
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      07-18-2019, 04:47 PM   #14
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Quote:
Originally Posted by jonobro View Post
You can't be saying that
put clothes line coated in grease down the spark plug hole slowly making a coil on top of the piston. Greased up the drill bit and tap and then remove it

https://www.ecstuning.com/b-lisle-pa.../lis65200~lis/

Just call a few shops and get a quote
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