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Thread chase restorer

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woody367

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Sep 22, 2014
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Location
Denver, NC
I have to replace the exhaust manifold on my truck this week. It has aluminum heads with M8x1.25 stud holes I need to cleam. I have been reading threads on the CRAFTSMAN 48 pc master rethreader but it seems they no longer make it. Looked at other kits and they are $75+ which I do not have right now. Is there any place to just get the one chase alone and buy a kit later? Just need to get this job done. From what I have read I should look for a Kastar/Lang 48 pc kit when I can afford one? Do not want to use a cutting tap and under cut the treads. Thank you
 
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BlakeTheCarGuy

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The Lang set is the best in my opinion. Great made set. I have the Snap-on version that I use at least a few times a week. Very nice set and does well. Made by Lang. I wouldn’t be worried about using a cutting tap. A cutting tap would clean it just as easily as the clean up rethreading tap would. In some cases you can clean it up by using the bolts to just do the same concept as you would a tap and run it back and forth. Just make sure you aren’t damaging the bolts by doing that. Some cases it works some it doesn’t. You maybe able to check your local hardware store and see if you could locate the individual one you need.
 
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unslow1

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Illinois
That Craftsman set is the same one sold under the Snapon and several other names. I have it branded Craftsman but a friend has it branded Snapon. You can buy much smaller kits. I have a couple of small sets from Jeg's also.

Google Lang 2588 and see if that's what you need.
 
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shawhite

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May 28, 2014
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1,519
Jawco is another brand. My question is are you cleaning studs or bolt holes. If I were cleaning studs I would use a split die like Murray or jme and thread it off to clean and debur any imperfections.
 
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jonesg

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stonesfan68 said:
You can always try taking a bolt with the same threads and cutting some slots in the threads so that the bolt resembles a thread chaser. Use lubricant and take your time, and be sure to back the bolt out every-once-in-awhile to clear the jink.
Click to expand...

I've done that, used a dremel cut off disk, cut vertical slots, worked for me.
It won't cut new threads but works fine for cleaning them out.
 
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ecotec

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Oct 5, 2010
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stonesfan68 said:
You can always try taking a bolt with the same threads and cutting some slots in the threads so that the bolt resembles a thread chaser. Use lubricant and take your time, and be sure to back the bolt out every-once-in-awhile to clear the jink.
Click to expand...
I would do that on an hourly job. I would not do that at home. I have a 48pc Lang set, the larger Snap-on SAE expansion pack, and some unbranded (Lisle?) individual chasing taps.

In my job… if a rethreading tap or die is needed on a job site… our foreman either has to provide one (which will never happen) or I have to make one… they will just give me a regular tap… so, at work I use regular taps…
 
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DGersic

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DeKalb, IL
You can get a set at AutoZone on their “tool rental” program. $100 set, no charge to you. You “buy” it, then “return” it when done.

Nice set. Includes SAE standard and fine thread, and metric. Taps, dies, and bolt thread files.

43870694-257D-41B1-94FA-2613E468A782.jpeg
 
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jpaw

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Michigan
Honestly with aluminum it is safer if the bolts come out clean to just blow the hole out and carefully put the new ones in by hand. There is way to much room for error trying to get things straight when doing it in chassis.
 
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decableguy2000

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Nov 4, 2012
Messages
652
You can order individuals from Lang as well. I have both Jawco and Lang, I can't see much of a difference in them.
 
OP
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woody367

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Sep 22, 2014
Messages
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Location
Denver, NC
I plan on doing this later in the week and want to have everything ready just in case. There are 8 studs to remove and hope non break. I have been soaking them for a few days now with PBlaster. Not a lot of room to work and last thing I need to to mess up the aluminum head holes. Thanks for all the input.
 
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Schurkey

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Oct 27, 2011
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The Seasonally Frozen Wastelands
Are the original bolts held in place with threadlocker?

That was the problem on my Trailblazer. Low-quality OEM bolts, stuck in place chemically. In removing the exhaust manifold, a person MUST use a swivel-socket so that no side-force is put on the bolts, which twist "hard" all the way out. Since folks don't use swivel sockets, broken bolts are a chronic problem with the six-popper Trailblazers and other GMT360/370 vehicles.

The replacement bolts I used were a stronger grade, and the Dorman bolt kit for that vehicle is also a higher-grade bolt.
 
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Rusted Nut

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woody367 said:
I plan on doing this later in the week and want to have everything ready just in case. There are 8 studs to remove and hope non break. I have been soaking them for a few days now with PBlaster. Not a lot of room to work and last thing I need to to mess up the aluminum head holes. Thanks for all the input.
Click to expand...
Use a little heat on the aluminum. A micro torch works well, don’t keep the flame in one place though. On exhaust studs I’ve always found a quick snap of the wrench works to break the stud loose better than applying steady pressure.
 
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unslow1

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Illinois
Rusted Nut said:
Use a little heat on the aluminum. A micro torch works well, don’t keep the flame in one place though. On exhaust studs I’ve always found a quick snap of the wrench works to break the stud loose better than applying steady pressure.
Click to expand...
Like taking out Ford spark plugs. Warm it up and use an impact?
 
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jonesg

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Mar 15, 2010
Messages
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Location
northern Maine/
woody367 said:
I plan on doing this later in the week and want to have everything ready just in case. There are 8 studs to remove and hope non break. I have been soaking them for a few days now with PBlaster. Not a lot of room to work and last thing I need to to mess up the aluminum head holes. Thanks for all the input.
Click to expand...
this is your opportunity to get an inductance heater.
if they snap thats the opportunity to grab a mig welder.
shop now.!
 
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signcrafter

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May 9, 2012
Messages
12,360
Snap on sells I individual ones and actually are a good deal for individuals since you dont have to pay shipping if you buy off the truck. I broke my m8x1.25 last week. Had a bolt hole that the bolt was going in hard so took bolt out and tried to clean with chaser. Ended up getting it stuck and it snapped when backing it out. Took part off and ended up using a punch to break the chaser into pieces and then drilled out the hole and taped for next size up bolt. Luckily was able to do that. So I need a new chaser. Ones I found online shipping made them double what snap on is. Looked on snap on and think it was like 5 bucks. Called and ordered one from my snap on guy.
 
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