Trying To Remove Head Studs On The 250 Engine
This 250 engine was a bit of a corroded wreck inside, as though someone used salt water for coolant. The heads were totally stuck on the studs, so we had to cut a few. But, with some heat and creativity we got all but two out.
Now, I have to get these totally frozen studs out, and before I went through the effort of setting it up on the milling machine to drill the remaining studs, I tried to weld washers and hex nuts on the stubs to twist them out. I welded a washer to the stud for maximum contact then welded a 17mm hex nut on the washer. I heated the block and melted a candle around the threads praying for the paraffin to act as a penetration oil. Unfortunately, I had no luck getting them out and because of the welding process, the studs are now further tempered and will be impossible to drill out.
Removing cleaning, detailing 250 Ferrari
Bassimento stud removal
Dusty Kennett said,
April 29, 2010 @ 10:28 am
they make a neat little portable edm’s for spark eroding taps and broken bolts might be worth its wait in gold or Ferrari blocks
Jack Hawkins said,
April 29, 2010 @ 12:14 pm
Ever considered placing the Cylinder head in a hot (450F) oven for an hour or so, and then carefully touching the stud(and just the stud!!) with a chunk of dry ice? I would think a real thermal shock to the stud might loosen it. Of course, your milage might vary….
admin said,
April 30, 2010 @ 7:20 am
Jack,
Great idea but the problem is the insane amount of puffy corrosion that even warming and cooling -or- heating up the aluminum casting (which expands greatly with heat) and chilling the stud does little to free up the corrosion. There are long 10mm studs that secure the intake manifolds on these V-12 Ferrari engines that get so stuck in place that no amount of heat/cool can get them out, it just requires force. We do the dry ice routine on valve seats, warm the cylinder head casting and chill the seat (and guide) allowing them to go in easily but never fall out.
Keith Goring said,
May 5, 2010 @ 10:21 am
Hi Guys,
Have you considered the EDM process. I have a customer who works with EDM equipment and it apparently does a superb job of removing steel studs from aluminum blocks.
Keith
Wil Stevenson said,
May 5, 2010 @ 2:12 pm
Another possibility might be EDM (Electric-Discharge Machining). It’s definitely going to remove material, don’t know how precisely it can be controlled. Or can it be set up on an old corroded 250 block to just remove the stud material and not touch the block? Inquiring minds……
admin said,
May 7, 2010 @ 7:17 pm
We tried EDM but there is not enough stud protrusion to make that work. If we had some more sticking out we could have used EDM. Quite a cool process