Re: head studs

Posted by Steve Ross on Oct. 19, 1998 at 10:14:04

In Reply to: head studs
posted by GG on Oct. 18, 1998 at 09:26:50

: Anyone have a trick to remove stuck head studs? have tried liquid wrench for one week HAVE(4)which will not come out.
: would heating the studs help?
Every once in a while a stud will break no matter what. If you are like me and resist send out your motor no matter what here is a tip from my site.
If you have the bad luck of having a stud break off when you are removing them from the block. Very carefully center punch the broken stud. Drill into the punch mark with an 1/8" drill about 1/8" deep. Then re-install 2 or 3 studs. Put the head back on. Use an 7/16" extra long center drill (5") in the hole where the stud is broken. drill down 1/2" and no more. The two pitfalls in drilling out a stud is you either use too large a drill when the centered drill hole is slightly off center and end up ruining the threads or you drill too deep piercing the water jacket at the base of the stud hole and as a result the stud will leak when the engine is assembled and running. Using the head as a guide will give you a well centered hole to drill from. In the final phase start with a 1/4' drill bit for the bottom piece of the stud and work up in size being careful not to go too deep and pierce thru the water jacket. Careful drilling will permit you to remove the old stud piece without damaging the threads in the block. Now chase the threads with a good quality bottoming tap stopping every turn or so and removing the tap and cleaning it, going down a little deeper
each time. If this does not work you'll have to redrill and tap the hole for a helicoil insert but at least the stud will be centered in the head hole after you are done.In the event you have pierced the water jacket at the base of the stud hole plug the pierced hole with two part plumbers epoxy this will act the same as the dentists filling

Rebuilding the model "A" engine

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