Thread Chaser for New Block???



Thread Chaser for New Block???

Postby Indycars » October 26th, 2010, 7:19 pm

With all the expenses of building a new engine and starting with a Dart SHP block, will I need to purchase dies to chase the threads in the block??? It's new, but does that exempt me from any of the normal procedures associated with building a new engine.

Comments or thoughts???
Rick
Too much is just enough!!!

- Check Out My Dart SHP Engine Project: viewtopic.php?f=69&t=3814
- Need a Dynamic Compression Ratio Calculator: viewtopic.php?f=99&t=4458
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Re: Thread Chaser for New Block???

Postby grumpyvette » October 27th, 2010, 6:51 am

people and company's occasionally make mistakes, your always better off using a thread chaser on all the threaded holes and blowing out the debris with high pressure air so YOUR sure the holes are correctly prepped.
just remember that a thread chaser tap is not a thread CUTTING TAP
http://www.jegs.com/p/ARP/ARP-Thread-Cl ... 8/10002/-1
http://www.jegs.com/i/ARP/070/911-0006/10002/-1
Image
http://www.mcmaster.com/#thread-forming-taps/=ke38k5
http://www.mcmaster.com/#standard-taps/=ke36u2
THESE ARE THREAD CHASERS NOT TAPS THAT ARE DESIGNED TO REMOVE METAL
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http://www.jegs.com/i/JEGS/555/80505/10 ... tId=751008
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these are thread chasers designed to clean and straiten old threads without cutting new threads or removing metal

http://www.carcraft.com/techarticles/th ... index.html

http://www.automedia.com/Thread_Repairs ... 021201tr/1

http://en.wikipedia.org/wiki/Tap_and_die

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DON,T FORGET TO CHASE THE BOLT THREADS and VERIFY the BOLT LENGTH and THE threaded hole DEPTH exceeds the bolt LENGTH to prevent binding and stripping threads

http://www.automedia.com/Bolt_Restorati ... 050701br/2

http://www.nzgaskets.co.nz/PDF/Cleaning ... hreads.pdf

viewtopic.php?f=50&t=6255&p=21695&hilit=cleaning+parts#p21695

viewtopic.php?f=50&t=6847&p=22224&hilit=cleaning+parts#p22224

harbor freight sells a good air nozzle for clearing thread holes
http://www.harborfreight.com/air-tools/ ... 42939.html

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http://www.sears.com/shc/s/p_10153_1260 ... 000P?mv=rr

http://www.fastenal.com/web/products/de ... 712&ucst=t

READ THIS
viewtopic.php?f=27&t=1262&p=6142&hilit=dies+taps#p6142

http://www.northerntool.com/webapp/wcs/ ... Bdie%2Bset

yes you'll eventually find these sets almost in-dispensable, you won,t use them daily but cleaning out threads before assembly and the use of anti-seize on threads will eventually become almost a habit

VERIFY THE BLOCK DECKS NOT WARPED
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"there is a difference between a thread chaser and a tap. There are actually three types of thread cutting taps for each size threads. A taper tap is for starting the threads, the plug tap is for making the threads go deeper/closer to the end of a blind hole, and a bottoming tap is just that, for getting closer to the bottom of a blind hole. A thread chaser is made different from a tap in that is does not have the sharp cutting edges, the flutes ground into it are not as deep. A thread chaser is for straightening out or cleaning out threads in either an open hole or blind hole. The body of a thread chaser has more metal in contact with the threads already cut into a hole therefore reducing the chance of cross threading"
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
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Re: Thread Chaser for New Block???

Postby Indycars » October 27th, 2010, 7:31 am

people and company's occasionally make mistakes, your always better off using a thread chaser on all the threaded holes and blowing out the debris with high pressure air so YOUR sure the holes are correctly prepped.
just remember that a thread chaser tap is not a thread CUTTING TAP

If you can screw the bolt all the way in by hand, is not really a good indication of the thread conditions.....right???

I do have a set of tap and dies up to 3/4" from Sears that I bought 30 years ago and you are right, I do need these more often then one would think.

If I wasn't spending several thousand dollars already I would just buy the thread chaser without question. I just know from experience there will be many things that cost $20-$30 at the end of this project, that I hadn't even considered . These expenses usually add-up to several hundred dollars before it's all said and done.
Rick
Too much is just enough!!!

- Check Out My Dart SHP Engine Project: viewtopic.php?f=69&t=3814
- Need a Dynamic Compression Ratio Calculator: viewtopic.php?f=99&t=4458
Indycars

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