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Join Date: Nov 2010
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Which Heli-coil size?

Hey Folks,

I need to heli-coil a stud in the head for the exhaust header. Anybody know what size I need? I don't want have to do the dismantle and take the stud down to Kragen thing.

Thanks

BP
Old 11-10-2010, 04:03 PM
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It's an M8 stud originally, but I'm doubtful of how well a helicoil will work. The time-sert is preferred, or drilling and tapping oversized (M9xM8 and M10xM8 step studs are available from some places) is preferred.

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Old 11-10-2010, 08:09 PM
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I've had a helicoil in my 2.0L head for 4 years. Works great. took 3 tries to get it right.
Old 11-11-2010, 10:45 AM
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I've used stepped studs before M8 on the bottom and either M9 or M10 where they screw into the head. In the past they were available from many shops/suppliers that dealt with air-cooled VWs (I even bought them from a VW dealer in the past). The trick is drilling out the old one...
Old 12-03-2010, 12:29 PM
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If you are in San Diego, I have several of the stepped studs w/ 9mm and 10mm large ends. You can have them for free. The note Dave made is correct and the other post about heli-coils is also right, it will take several tries to get it right! Time-serts generally work right once.

If you have never done any of these possibilities I would suggest making a guide for drilling and tapping as it is very easy to make the stud set at an angle and then you will pull it out and/or the copper gasket will leak.
Old 12-03-2010, 04:27 PM
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