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Slippery Slope Expert
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Head Stud Extraction
I saved myself a bunch of money at the machine shop this afternoon. I fairly easily extracted all twelve Dilavar head studs, including the broken one in just a little over an hour. No fuss, no strain, no drama. This has been beat around before here, but for the record here's how I did it.
About 24 hours before hand I soaked the bases of the studs with Kroil (some of them) and the rest with Ballistol. For those of you unfamiliar with Ballistol it's a gun developed in Germany around WWI. Works great for guns and there are anecdotal claims for a bunch of other stuff (the Avon Skin So Soft of gun oils). It was suggested to me that it was a good penetrating oil and I think that may be so. I got to see a lot of it bubbling up around the threads as I heated things up that's for sure. Has a distinctive odor (and not as pleasant as beeswax as I've seen others have used. For tools I used the Snap-On stud remover as suggested in Wayne's book on rebuilding 911 engines on the unbroken studs with threads remaining. For the broken stub I used another stud remover made for 8mm studs which worked nicely with the smooth stud. It looks like a deep socket and has some kind of eccentric design that clamps the stud harder the harder you pull on it. This tool was left over from some other machine long ago - either the 914-6 or the BMW bikes. In any case a job I was dreading was done, a bunch of money was saved, and I can move on with it! |
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06-28-2014, 01:26 PM
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Straight shooter
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Is this the second type of tool you use?
1/2 in. Drive Stud Extractor I used this exact one and removed all of my studs as well with relative ease.
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“Of the value traps, the most widespread and pernicious is value rigidity. This is an inability to revalue what one sees because of commitment to previous values. In motorcycle maintenance, you MUST rediscover what you do as you go. Rigid values makes this impossible.” ― Robert M. Pirsig, Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values |
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06-28-2014, 01:45 PM
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Registered
Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,502
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I have that extractor but from sears. The dilivars eats up the teeth and make it difficult to unload
Especially at 8 mm. The most efficient one I have is from Titan tools Bruce |
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06-28-2014, 03:54 PM
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Try not, Do or Do not
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We use the Snap-on collet style stud remover.
With an oxy-acetylene torch coupled with a 3/8 (locking the collet) and 1/2 impact gun (removing the stud), you can do the job in about 20 minutes without damaging the stud. This becomes important if your reusing a high quality stud like the Supertec head stud. The collets are available in almost any thread pitch.  
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Henry Schmidt SUPERTEC PERFORMANCE Ph: 760-728-3062 Email: supertec1@earthlink.net |
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06-28-2014, 06:31 PM
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Slippery Slope Expert
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The Snap-On tool I used is like the one shown, the collet type. However that won't work where there are no threads, which is the case when a head stud snaps in the usual spot. The tool I used for that one was made for pulling 8mm studs only, i.e. made for a specific purpose. I have no idea where I got it or the make (see if you recognize the logo on the attached image) but it may have come from Stoddard Imported Cars back in the late eighties.
Looking down into the "business end" you can see what looks like four equally space rollers (like roller bearings) with the brass "race" ( easiest way to describe it) in between. It gripped the remaining shank of the broken stud great. However this won't solve another problem; see coming thread "Exhaust Stud Replacement" |
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06-29-2014, 05:43 AM
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Slippery Slope Expert
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Opps, forgot to upload images in the previous reply; here they are.
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06-29-2014, 05:45 AM
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Slippery Slope Expert
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And number two; having trouble today!
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06-29-2014, 05:46 AM
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Registered
Join Date: Jul 2006
Location: S. Florida
Posts: 7,249
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I got a set of those on ebay a few months ago for $38 shipped. 6, 8, 10, and 12mm sizes all half inch drive and they work great.
Look like they're out if them now. 
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06-29-2014, 09:31 AM
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Slippery Slope Expert
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That looks like it for sure. I need to order the whole set.
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06-29-2014, 09:42 AM
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Registered
Join Date: Jul 2006
Location: S. Florida
Posts: 7,249
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I just looked on ebay and another place has the same ones listed for a few dollars more with the shipping added on.
They come in a nice molded plastic case too. |
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06-29-2014, 10:10 AM
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abit off center
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Head Stud Extraction
I have made custom smooth bore collets to use with my snap on stud remover for studs without threads and for pulling alignment pins etc. these things have huge clamping pressures. I think snap on even sells them?
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______________________ Craig G2Performance Twinplug, head work, case savers, rockers arms, etc. |
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06-29-2014, 10:11 AM
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Registered
Join Date: Jan 2004
Location: CT
Posts: 11,552
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I have had good experience removing broken studs by running an M8 die onto the broken end to produce M8 threads and then using the Snap-On tool with an M8 collet to remove the stud. Map gas heat is usually required to melt the thread locker.
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Tom Butler 1973 RSR Clone 1970 911E 914-6 GT Recreation in Process |
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06-29-2014, 11:41 AM
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83 911 Production Cab #10
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Quote:
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Who Will Live... Will See  83 911 Production Cab #10, Slightly Modified: Unslanted, 3.2, PMO EFI, TECgt, CE 911 CAM Sync / Pulley / Wires, SSI, Dansk Sport 2/2, 17" Euromeister, CKO GT3 Seats, Going SOK Super Charger |
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06-29-2014, 02:39 PM
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P911
Porsche
Retor 911
Scarab
Riley
1969 and 1986 Porsche Targa and Coupe 1720cc and 3
Das Babe
Das Babe Metalberiech
