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#4457996 - 07/13/17 08:40 AM Thread cleaning tap--M12 x 1.25 for block
BigD1 Offline


Registered: 08/12/15
Posts: 2575
Loc: NC
Need a M12 x 1.25 thread cleaning tap, so I can clean the block head bolt holes on my Toyota pickup . All I can find is ARP 912-0006 thread cleaning tap, and it is ridiculously priced round about $65 to $70.

I can find plenty of regular four flute cutting taps, but I don't think I should be using those to clean holes. Don't want to take a chance of messing up a good block.

Only option I have right now is to cut slots in a head bolt which I think would work, but it's definitely not ideal. Don't want to be cutting slots on bolt threads, and I might end up with messed up threads.

Let me know please what options I have, or where I can get a thread chaser that's reasonably priced. Cleaning tap will have to be long enough to go down in a blind head bolt hole, so a little stubby won't work.
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#4458049 - 07/13/17 09:41 AM Re: Thread cleaning tap--M12 x 1.25 for block [Re: BigD1]
Rand Offline


Registered: 08/20/03
Posts: 12650
Loc: NE,Ohio
From what I can see you have the normal 4 fluted design starting around 8$ or really expensive ones

If you are careful I dont think you would have a problem with a normal tap.. once its in a few threads.

I have done this many times.. however you must use caution of course.

I would get something like this
https://www.amazon.com/IRWIN-1842ZR-Tap-...ds=m12+1.25+tap

The comments section people are mentioning it worked good on their 22R head.. so I must not be the only one that thinks it is ok to do so.
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#4458082 - 07/13/17 10:12 AM Re: Thread cleaning tap--M12 x 1.25 for block [Re: BigD1]
Reddy45 Online   shocked


Registered: 08/15/08
Posts: 2971
Loc: USA
Might check if you can rent one from a auto parts store or maybe even a local machine shop.

But funny thing about chasing threads... I think it was the practical machinist forum where this question came up and the folks there all agreed that you would just run a cutting tap through the hole. The idea of a tap made specifically for cleaning threads didn't make any sense.

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#4458091 - 07/13/17 10:23 AM Re: Thread cleaning tap--M12 x 1.25 for block [Re: BigD1]
andyd Offline


Registered: 09/25/04
Posts: 7156
Loc: Marshfield , MA
If you're worried, buy another M12 bolt and a nut or 2. Dremel, or hack saw the flutes. Use the nuts to clean up the threads after cutting the flutes. The last head I did, I ran a head bolt in and then blew any debris out of the holes. If the bolts came out without drama, they should go back in likewise. I was taught to push the bolts through cardboard in the way they came out, so the bolt goes back where it came from. How are the intake and exhaust manifolds' hardware?
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#4458138 - 07/13/17 11:02 AM Re: Thread cleaning tap--M12 x 1.25 for block [Re: BigD1]
Donald Offline


Registered: 03/21/04
Posts: 20461
Loc: Upstate NY
You need a bottoming tap not a regular tap.
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#4458141 - 07/13/17 11:05 AM Re: Thread cleaning tap--M12 x 1.25 for block [Re: Rand]
BigD1 Offline


Registered: 08/12/15
Posts: 2575
Loc: NC
Originally Posted By: Rand
From what I can see you have the normal 4 fluted design starting around 8$ or really expensive ones

If you are careful I dont think you would have a problem with a normal tap.. once its in a few threads.

I have done this many times.. however you must use caution of course.

I would get something like this
https://www.amazon.com/IRWIN-1842ZR-Tap-...ds=m12+1.25+tap

The comments section people are mentioning it worked good on their 22R head.. so I must not be the only one that thinks it is ok to do so.


Already had that one in my cart!

If I do end up buying a cutting tap, I think I will buy the Kodiak. It states in the description that it is used for 22RE doing rebuilds.

https://www.amazon.com/gp/product/B007BTQJEE/ref=ox_sc_act_title_2?smid=ATVPDKIKX0DER&psc=1
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#4458146 - 07/13/17 11:10 AM Re: Thread cleaning tap--M12 x 1.25 for block [Re: BigD1]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
Why use a tap at all?

In aerospace, you just do a "running torque"

If the bolt reaches the bottom of the hole without having to apply excessive torque (like, just a couple inch pounds) then leave the threads ALONE.

I've seen too many taps take good metal out of holes that were fine if just left alone. The "run of the mill" taps you can buy usually do this.

"ridiculously priced round about $65 to $70"
You think Toyota made your block threads with an $8 tap?!?!? SHEESH!!

You are dangerously close to making a good situation worse if you go by what you "feel" and not by applying GOOD machinist practices!!
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#4458165 - 07/13/17 11:31 AM Re: Thread cleaning tap--M12 x 1.25 for block [Re: BigD1]
Trav Offline


Registered: 11/20/06
Posts: 18893
Loc: MA, Mittelfranken.de
Just cut a a couple of flutes in the head bolt with a dremel if you really need a chaser, if you need to fix slightly buggered threads cut 3 or 4 in a hardened bolt or buy this, its the same thing but high quality. I much prefer using a bolt than a cutting tap if the threads just need a good cleaning, most of the time I just use a plumbers 1/2" or 3/4 pipe cleaning brush with some liquid wrench on bolts 12mm and up twist it down and rotate it not push pull then wash the hole out with brake fluid and an air blow gun.
You can also use a small wire round brush on a dremel and rotate it around on low speed, works fine also.

http://www.ebay.com/itm/M12-x-1-25-Spark-Plug-Thread-Forming-Roll-Tap-Cleveland-USA-Harley-Twin-Cam-NOS-/322576544914?hash=item4b1b0f7492:g:emQAAOSwubRXNSpo&vxp=mtr

Edit: As posted if the bolt goes in and goes all the way down the threads, clean it with some brake cleaner an be done with it, leave well enough also.


Edited by Trav (07/13/17 11:33 AM)
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#4458166 - 07/13/17 11:31 AM Re: Thread cleaning tap--M12 x 1.25 for block [Re: andyd]
BigD1 Offline


Registered: 08/12/15
Posts: 2575
Loc: NC
Originally Posted By: andyd
How are the intake and exhaust manifolds' hardware?


The only two local automotive machine shops around here are backed up for about two weeks. Can't let this truck sit this long waiting on head work. Head has about 186,000 miles on it, and it's possible that the head has already been straightened one time or another.

I bought a new casting head loaded that will be ready to drop in after I get it apart. I bought an exhaust and intake manifold stud kit from LCE Performance. Mostly use bolts on the intake on stock head, but I am going to install the intake stud kit which will make it easier to hang the manifold plus I won't wear out the threads on the intake side of the head if I have to take it apart again.

Doing the whole top end on my 22RE since I am in that far doing a head gasket plus I have slight chain slap at cold startup after it sits all night. It's got 186,000 miles on the engine. Going to install new water pump, fan clutch, oil pump, timing set, timing cover, and new cylinder head bolts.
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#4458203 - 07/13/17 12:01 PM Re: Thread cleaning tap--M12 x 1.25 for block [Re: Trav]
BigD1 Offline


Registered: 08/12/15
Posts: 2575
Loc: NC
Originally Posted By: Trav
Just cut a a couple of flutes in the head bolt with a dremel if you really need a chaser, if you need to fix slightly buggered threads cut 3 or 4 in a hardened bolt or buy this, its the same thing but high quality. I much prefer using a bolt than a cutting tap if the threads just need a good cleaning, most of the time I just use a plumbers 1/2" or 3/4 pipe cleaning brush with some liquid wrench on bolts 12mm and up twist it down and rotate it not push pull then wash the hole out with brake fluid and an air blow gun.
You can also use a small wire round brush on a dremel and rotate it around on low speed, works fine also.

http://www.ebay.com/itm/M12-x-1-25-Spark-Plug-Thread-Forming-Roll-Tap-Cleveland-USA-Harley-Twin-Cam-NOS-/322576544914?hash=item4b1b0f7492:g:emQAAOSwubRXNSpo&vxp=mtr

Edit: As posted if the bolt goes in and goes all the way down the threads, clean it with some brake cleaner an be done with it, leave well enough also.


Yes I am going to leave well enough alone!

Believe I will be OK using a 1/2 plumbers heavy duty fitting brush with some Liquid Wrench per your suggestion. Will keep it simple and cheap, and it should do a good job.

http://www.homedepot.com/p/Oatey-1-2-in-Heavy-Duty-Fitting-Brush-313272/100142649
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1992 Toyota Pickup--Havoline HM 10W-30--Motorcraft FL-910S

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#4458228 - 07/13/17 12:33 PM Re: Thread cleaning tap--M12 x 1.25 for block [Re: BigD1]
Trav Offline


Registered: 11/20/06
Posts: 18893
Loc: MA, Mittelfranken.de
That's the one, it works great, just a couple of turns and your done.
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#4458277 - 07/13/17 01:31 PM Re: Thread cleaning tap--M12 x 1.25 for block [Re: BigD1]
Yah-Tah-Hey Offline


Registered: 05/26/14
Posts: 3409
Loc: Columbus,Nebraska
A M12X1.25 bottoming tap should be all you need.Go very easy and use a cutting oil. And use the smallest wrench you have on the tap. You may be able to find a chasing tap in the required size but I don't think you need it.

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#4458510 - 07/13/17 05:07 PM Re: Thread cleaning tap--M12 x 1.25 for block [Re: BigD1]
scurvy Offline


Registered: 02/19/07
Posts: 2372
Loc: Chicago IL USA
It sounds like you're just trying to clean up the threads. Would a back tap work? It's a collapsable thread chasing tap that you insert into the bottom of a tapped hole (where the threads are usually not boogered up), expand the tap to mate with the threads, then turn it backwards to clean out and refine any of the threads that need some improvement.

https://smile.amazon.com/Back-Tap-12-Millimeter-Reverse-Re-Thread-Tool/dp/B000NOX3KW

?
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#4458583 - 07/13/17 06:27 PM Re: Thread cleaning tap--M12 x 1.25 for block [Re: BigD1]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Why not a re-threading tap if all you're doing is cleaning threads ?



https://store.snapon.com/Rethreading-Tap...t--P651935.aspx

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#4458674 - 07/13/17 07:53 PM Re: Thread cleaning tap--M12 x 1.25 for block [Re: scurvy]
BigD1 Offline


Registered: 08/12/15
Posts: 2575
Loc: NC
Originally Posted By: scurvy
It sounds like you're just trying to clean up the threads. Would a back tap work? It's a collapsable thread chasing tap that you insert into the bottom of a tapped hole (where the threads are usually not boogered up), expand the tap to mate with the threads, then turn it backwards to clean out and refine any of the threads that need some improvement.

https://smile.amazon.com/Back-Tap-12-Millimeter-Reverse-Re-Thread-Tool/dp/B000NOX3KW

?


Not sure about that type because I have never used one.
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1992 Toyota Pickup--Havoline HM 10W-30--Motorcraft FL-910S

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