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Stripped threads in block- best option?
by
Vanagoner
on 31 May, 2008 17:38
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Head gasket job, '81 1.6 mechanical n/a, old non-stretch bolts, corner one stripped at 70 ft/lbs.
What is the best thing to do at this point- can a helicoil even be bought for this size? Would a stud kit work in it the way it is?
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#1
by
Possum79
on 31 May, 2008 19:21
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I can't remeber who said it but a stud kit will grab a lot more threads then the bolts do. It goes much deeper then the head bolt does so it should work. Unless its totally toast.
or drill/tap to 12mm?
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#2
by
subsonic
on 31 May, 2008 19:59
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I vote for tapping it to 12mm and buying 1 12mm head bolt. Problem solved. Was the 70lbs of torque the part with the "additional half turn"?
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#3
by
fatmobile
on 31 May, 2008 23:18
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I'd say 11mm stripped out hole will have 1/2mm on each side of the bolt for threads if you are planning to tap it to 12mm.
Are 1/2mm deep threads enough?
Looking at my trusty ruler, I'd say ,"No".
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#4
by
Vanagoner
on 01 Jun, 2008 08:15
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No subsonic, I was on my way up to 90 with all of them. All I have at this point is a Haynes manual and I couldn't find the torque spec in there.
I would try 1 12mm bolt to get me by, but after buying a tap of whatever size that is I'd be partway to a stud kit, which would be better overall.
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#5
by
subsonic
on 01 Jun, 2008 13:51
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The spec for 12mm bolts on my 1.6na is 44pounds plus a 180 degree additional turn on each.
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#6
by
gldgti
on 01 Jun, 2008 14:14
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you can get helicoils that big easy, and they work perfectly well. helicoils are actually often better performing than original.
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#7
by
RabbitJockey
on 01 Jun, 2008 14:22
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it could already be an 11mm motor, my old 81 had 12 mm head bolts and a 19mm crank bolt
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#8
by
Turbinepowered
on 01 Jun, 2008 17:34
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Spec for 11mm bolts (1.5) is 65 ft-lbs as per Bentley.
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#9
by
Vanagoner
on 01 Jun, 2008 19:44
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:oops: as the old saying goes, if you think education (a bentley manual) is expensive, try ignorance. :oops:
thanks guys- I'll helicoil it, and go shopping for a proper manual
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#10
by
fatmobile
on 01 Jun, 2008 23:19
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There was a post about this, over on vwdieselparts.com.
Someone suggested there is something better than helicoil,... something that goes farther into the block.
Helicoils are short and can put too much pressure in a small area.... stripping it out or cracking the block.