I've gotten past broken easy outs too. I learned it's far more effective to weld a nut over the broken bolt then unscrew it. Broken easy outs are a nightmare.
A tap and a thread-chaser are 2 different things. Taps are tapered, and thread-chasers are not. For chasing threads, a thread-chaser is a better choice than a tap.
interesting: I will ask my Guy at the machine shop what they use when they "clean the threads" after machining a block...
There are different styles of taps. Bottom taps are not tapered. Starting taps are. I the case of this crankshaft, a std tap is what he wants, not a non tapered thread chaser, it needs to go far enough in to start to thread before removing the damaged threads in the top of the hole
agree: he could run it in just far enough to cut the first thread, this way won't chance damaging the other threads...
I saw a guy at a repair shop drive the crank bolt in with a hammer to get it started and then pull it on in with an air gun...he said "ever who has to remove it will be the one who has to fix it"...
I trust you left there and never went back. I've met a few screw balls like that too. One was a Pontiac dealer's mechanic. I was looking for replacement flexplate bolts for a Poncho 301. I had 4 good-uns, and they had none in stock. He told me those 4 good-uns was good enough. :16suspect
I'm getting a tap today and I was wondering what the thread size in the crank is, is it 7/16-20 or 5/8-18
while we're involving the grammar police.. it would be even better if the word was speeled correctly too. lol fortunately for the OP.. most can read past the small errors to help him out. and again.. the balancer bolt used in these sbf cranks is a finer 7/16 x 20 thread.
