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Need a tap - inlet carb manifolds #119716
07/16/07 2:02 pm
07/16/07 2:02 pm
Joined: Aug 2005
Posts: 1,145
Indy
Vox Teardrop Offline OP
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Vox Teardrop  Offline OP
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I screwed up a couple of threads in my cylinder head where the inlet manifolds screw into the head (72' T120 Bonneville). Where might I get the correct tap to clear those threads out so I can get the new inlet manifold to screw in? Also, what is the correct tap for this thread?

Cheers!


95' Triumph Speed Triple
72' Triumph T120
64' BSA Lightning Rocket
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Re: Need a tap - inlet carb manifolds #119717
07/16/07 4:26 pm
07/16/07 4:26 pm
Joined: May 2006
Posts: 151
Warrington, Cheshire, UK
TriVin Offline
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TriVin  Offline
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Warrington, Cheshire, UK
My 72 is 5/16 UNC. You should get a tap at any good tool shop. I got one for 2 but I'm in the U.K. so its no good giving you the web site I used www.TracyTools.com is it.

laughing


Dave
Tiger 100SS 1966
T120V 1972
Vincent Comet 1952
Re: Need a tap - inlet carb manifolds #119718
07/16/07 4:55 pm
07/16/07 4:55 pm
Joined: Aug 2005
Posts: 1,145
Indy
Vox Teardrop Offline OP
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Vox Teardrop  Offline OP
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5/16? This thread is over an inch in diameter.


95' Triumph Speed Triple
72' Triumph T120
64' BSA Lightning Rocket
Re: Need a tap - inlet carb manifolds #119719
07/16/07 5:19 pm
07/16/07 5:19 pm
Joined: Jun 2002
Posts: 9,950
Scotland
S
Stuart Offline
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Stuart  Offline
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S
Joined: Jun 2002
Posts: 9,950
Scotland
Hi,

Quote:
Originally posted by Vox Teardrop:
5/16? This thread is over an inch in diameter.
According to the '72 parts book, there are 'early' heads and 'late' heads.

'Late' heads mount the carbs. to the head with 5/16"-dia. studs that screw into the head at one end, pass through the manifold (effectively just a spacer) and the carb. flange and take a nut on the other end.

Otoh, 'early' heads take manifolds with an external thread that screw into the inlet ports of the head.

Vox: Those manifolds have a locknut (S1932) each. If you don't have thread gauges (I'll presume you have a decent steel ruler to measure the i.d. of the locknut wink ), can you not take one with you to the tool supplier to help you locate the correct tap? I'll be very surprised if it isn't either Cycle or UNF (or possibly UNEF).

Hth.

Regards,

Re: Need a tap - inlet carb manifolds #119720
07/16/07 5:26 pm
07/16/07 5:26 pm
Joined: May 2006
Posts: 151
Warrington, Cheshire, UK
TriVin Offline
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TriVin  Offline
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Posts: 151
Warrington, Cheshire, UK
Ah! Sorry, thats the earlier head than mine. You have the large round stubs with a locknut? I thought that they had stopped that by 72, part of the OIF changes. frown


Dave
Tiger 100SS 1966
T120V 1972
Vincent Comet 1952
Re: Need a tap - inlet carb manifolds #119721
07/16/07 6:36 pm
07/16/07 6:36 pm
Joined: Aug 2005
Posts: 1,145
Indy
Vox Teardrop Offline OP
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Vox Teardrop  Offline OP
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Yea, large round stubs with a locknut. Anyone know of any tool shops in the USA which will carry a tap for this?


95' Triumph Speed Triple
72' Triumph T120
64' BSA Lightning Rocket
Re: Need a tap - inlet carb manifolds #119722
07/16/07 8:39 pm
07/16/07 8:39 pm
Joined: Jun 2006
Posts: 804
Halifax, Butt end of Europe
andrewinpopayan Offline
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andrewinpopayan  Offline
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Posts: 804
Halifax, Butt end of Europe
Could even be a gas fitting thread BGT, best measure the TPI and diameter. Theres a toolshop near me that has lots taps for obscure/obsolete threads, if you can identify the thread, let me know. Close up foto?

Gas thread is 40TPI, it was phased out in the 40's but there is still some legacy stuff about (the threads on light fittings for lampshade holder is BGT in the UK)


99% of carb problems are electrical.

1959 3TA

BMW R1150 Oilhead
Re: Need a tap - inlet carb manifolds #119723
07/16/07 10:52 pm
07/16/07 10:52 pm
Joined: Mar 2005
Posts: 10,147
Boston, Massachusetts
J
John Healy Offline

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John Healy  Offline

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J
Joined: Mar 2005
Posts: 10,147
Boston, Massachusetts
1 3/8" x 16 tpi


Re: Need a tap - inlet carb manifolds #119724
07/17/07 1:32 am
07/17/07 1:32 am
Joined: Jan 2003
Posts: 554
west central ohio where all be...
D
drp Offline
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D
Joined: Jan 2003
Posts: 554
west central ohio where all be...
Vox

I buy all my strange size taps from Bass Tool in Houston. This one is a UNEF (united national extra fine) and Bass tool has the tap for $45.86 (actually not a bad price for a tap that big). Their website is www.basstool.com and the link for the page is http://www.basstool.com/PDF/Binder5.pdf. You can also just call them up. Their phone # is 1-800-442-0042. I can't verify the size but according to their catalog their P/N for a 1 3/8 - 16 is 372460 (but verify the P/N). They are good folks to deal with and I have bought a number of large UNEF's from them but unfortunately not that big or I'd loan it to you.

Dave Parker

Re: Need a tap - inlet carb manifolds #119725
07/17/07 2:09 am
07/17/07 2:09 am
Joined: Jan 2003
Posts: 554
west central ohio where all be...
D
drp Offline
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drp  Offline
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D
Joined: Jan 2003
Posts: 554
west central ohio where all be...
Vox

Just for yucks I did a search and found one on eBay for 29.99 buy me now. It's only got 16 hours so I hope this gets to you before the auction ends.

Dave Parker

Good luck & see you at Mid Ohio

http://cgi.ebay.com/1-3-8-16-HSS-Plug-ta...1QQcmdZViewItem

Re: Need a tap - inlet carb manifolds #119726
07/17/07 3:18 am
07/17/07 3:18 am
Joined: Jun 2002
Posts: 9,950
Scotland
S
Stuart Offline
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Stuart  Offline
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S
Joined: Jun 2002
Posts: 9,950
Scotland
Hi,

Quote:
Originally posted by drp:
This one is a UNEF (united national extra fine)
I hate to rain on the parade but, no, it isn't - 1-3/8"UNEF is 18tpi.

Unfortunately, despite many goes with Google, what I can't find is anything showing large Cycle threads (although the part numbers changed between '68 and '69, which suggests it might not be Cycle anyway? frown ). However, I can confirm the thread isn't BSP, NPT or NPS.

Hth.

Regards,

Re: Need a tap - inlet carb manifolds #119728
07/17/07 6:02 am
07/17/07 6:02 am
Joined: Oct 2004
Posts: 4,429
Melbourne Australia
Tiger Offline
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Tiger  Offline
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Posts: 4,429
Melbourne Australia
I think Brownowl may be right re the thread file, it is a bloody big thread for not much load and a little low strength Loctite would ensure a seal.

If you had a spare stub maybe slot that across the threads [like a tap] warm the head and freeze the stub and see if you can [very gently] run the stub/tap in and wait for temps to equalise before running it back out, be really carefull to de-burr the "tap" of course.


1969 TR6R
7.62 x 51 is not a maths puzzle.
Re: Need a tap - inlet carb manifolds #119729
07/17/07 1:39 pm
07/17/07 1:39 pm
Joined: Aug 2005
Posts: 1,145
Indy
Vox Teardrop Offline OP
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Vox Teardrop  Offline OP
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I just ordered that tap that DRP found on eBay. That will work correct? I can always sell it once I've used it.


95' Triumph Speed Triple
72' Triumph T120
64' BSA Lightning Rocket
Re: Need a tap - inlet carb manifolds #119730
07/17/07 11:36 pm
07/17/07 11:36 pm
Joined: Jan 2007
Posts: 178
Sydney, Australia. I might be ...
Phrog Offline
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Phrog  Offline
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Posts: 178
Sydney, Australia. I might be ...
Quote:
Originally posted by Vox Teardrop:
I just ordered that tap that DRP found on Ebay. That will work correct? I can always sell it once I've used it.
Check the thread on the tap against the thread on the manifold stub before you run it through the head, just to make sure. (a good head is hard to find) bigt


Glenn.
1969 T120
"SUCH IS LIFE"
Re: Need a tap - inlet carb manifolds #119731
07/18/07 12:05 am
07/18/07 12:05 am
Joined: Jan 2003
Posts: 554
west central ohio where all be...
D
drp Offline
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drp  Offline
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D
Joined: Jan 2003
Posts: 554
west central ohio where all be...
If you are unsure you could try running the lock nut onto the tap. It may fit a little tight but it should be obvious if it isn't the right size. Be careful when you start the tap, big taps can be difficult and will take some fiddling. I'd initially start it by hand and spare the wrench. Tools are like british motorcycles ...if you have the room you can never have too many.

Dave


Moderated by  John Healy 


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