Author Topic: sluge trap screw  (Read 1014 times)

Offline edboy

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sluge trap screw
« on: 16.06. 2014 00:46 »
hello. i ve just slaughtered both sludge trap screws out of a small journal a10 crank. it cost me 2 impavt driver heads. trap totally blocked so more than necessary. now i need to know what size thread they are to clean them up. they look bsc but what size? any experts out there?
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Offline duTch

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Re: sluge trap screw
« Reply #1 on: 16.06. 2014 09:16 »
Dunno ' bout the small ones, but the LJ ones are 11 tpi - BSF, I think 7/8".
I expect the small crank ones will also be BSF..?

 Get some replacement ones first (socket hex ones from SRM), to be sure, and ask them for confirmation..
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Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
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Offline wardleybob

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Re: sluge trap screw
« Reply #2 on: 16.06. 2014 19:14 »
Can't be sure but I think they are 9/16 cycle thread .
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Offline The Artful Bodger

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Re: sluge trap screw
« Reply #3 on: 16.06. 2014 20:32 »
They're cycle thread, I bought a tap to do mine last year but can't put my hands on it right now to give you the size.
Colin
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Offline trevinoz

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Re: sluge trap screw
« Reply #4 on: 16.06. 2014 22:14 »
If they are available, it would be a good idea to use Allen head plugs when you are putting things back together.

Trev.
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Offline edboy

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Re: sluge trap screw
« Reply #5 on: 17.06. 2014 01:23 »
thanks for replys but i think they are larger than 9/16" but suspect they are bsc. i need a tap to clean up the thread before replacing them with the allen key ones. i realise now , too late, that i should have heated them up before removal.
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Online bsa-bill

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Re: sluge trap screw
« Reply #6 on: 17.06. 2014 10:35 »
now is the time for caution, I'd be 100 % certain of the size and thread before putting a tap anywhere near ( ask when you purchase new ones)
the wrong tap is going to be expensive
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All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline edboy

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Re: sluge trap screw
« Reply #7 on: 18.06. 2014 01:05 »
come on the artfull bodger.  find that tap . is it 5/8"bsc?  i m dying with suspense here.  the pressure is on and i may have to pick up the phone to srm as a last resort.
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Offline The Artful Bodger

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Re: sluge trap screw
« Reply #8 on: 20.06. 2014 17:16 »
Sorry I haven't been looking at the forum for a few days. I dug out my box of cycle taps and found an almost new 5/8" 20 tpi, 99% sure this is the one I bought for the sludge traps.
 Colin
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Offline duTch

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Re: sluge trap screw
« Reply #9 on: 21.06. 2014 00:08 »

 Might be best to pick up the phone and make sure.....?
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Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia

Offline edboy

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Re: sluge trap screw
« Reply #10 on: 21.06. 2014 21:22 »
thanks  artfall dodger , i ve ordered taps that size. obviously a oneoff size but i guess used elsewhere on the bike. i havealso looked up better methods for removal such as drilling through the centre and welding a bolt to the plug which would also burn off any locktight.i wish i had known that before.
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Offline The Artful Bodger

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Re: sluge trap screw
« Reply #11 on: 21.06. 2014 22:18 »
You're in the UK, I don't know if you've bought from "Tracy" before, I get most of my taps and dies from them www.tracytools.com
    If I'm going to use them a lot I buy tool steel, but for occasional use I buy their carbon steel which are very good quality. The one I bought for the sludge trap was carbon steel and worked fine despite mine being in a similar state to yours (hence the need for a tap!)
  I can highly recommend their helpful service and quality of tools.
Colin
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Offline edboy

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Re: sluge trap screw
« Reply #12 on: 22.06. 2014 13:18 »
thanks for recommendation bodger. i remember tracy tools when they were in brentford years ago when we also had manufacturing factorys in london, and plenty of jobs, labour party, page 3 , clocking in and clocking out. asbestos everywhere , yes those were the days.
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