what tap to clean up crank threads?
Thread Starter
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Joined: Jul 2004
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From: It's hard work to look this good
what tap to clean up crank threads? I know the thread size of the crank bolt is 16mm x 2.0 pitch, will someone pick me the right tap from the link so I can clean up the crank threads. I figure I am going to need a stong one. Do I get a straight or tappered or....
someone help me out. If you know of a better place please tell me.
Thanks,
Shane TAPS
someone help me out. If you know of a better place please tell me.
Thanks,
Shane TAPS
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Joined: May 2005
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From: Blairsville, GA
Since you're cleaning out threads and not making new ones, I'd suggest a spiral flute tap. We use them at the shop when we're cleaning out old rusty threads, and they work like a charm with a spritz of WD40.
Thread Starter
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From: It's hard work to look this good
What would be a good tap to make new ones ? This would be for the crank snout so what length should the tap be ? Better yet, anyone who has chased or re-taped an LS1 crank please chime in. What did you use ? Did you go up a size, can you ?
11 Second Club
Joined: Feb 2003
Posts: 523
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From: WESLACO, TEXAS
get a helicoil kit bro, I had a nightmare one time when, an arp bolt snapped in the crank snout, i drilled it out and helicoiled it. that thing is strong, and i've done numerous pulley removals and installs and works better than the way it was before, let me know I think i have the kit still available but w/ only 1 or 2 inserts left.
Eddie
Eddie
I would use the straight flute bottom tap, just for the reason that the threads are resecesed in the crank snought. With a bottom tap you will for sure get to the end of the threads vs a tapered tap.
Teching In
Joined: Jan 2006
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i stripped the threads out on a 454 one time because the crankshaft pulley was way too tight (broke a puller tryin to get it off) i ended up drilling and tapping to 1 size bigger, and drilling out the pulley on a drill press. worked great 
just use a normal tap you can buy at the hardware store
just use a normal tap you can buy at the hardware store
