Author Topic: c11g a/r unit  (Read 490 times)

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Offline Ginge

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Re: c11g a/r unit
« Reply #15 on: January 05, 2019, 08:27:48 pm »
Hey kdm,

Happy New Year.  Did you get that AAU shaft out? 

Thinking laterally is there any way you can pull the whole cam gear off and seperate the bits on the bench?  I can't remember but I thank the gear is held on a key way and taper arrangement.  You'll have to mark the timing so it goes back on in the same tooth.

Have you tried a penetrating oil?  It shouldn't be corroded but you never know.

Can you find a grease nipple big enough to screw into the internal thread on the end of the shaft and pump it full of grease.  Not sure if that is an option.  The cam gear might just keep swallowing grease....

Keep at it mate.
Ginge.

Online timsdad

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Re: c11g a/r unit
« Reply #16 on: January 06, 2019, 09:14:12 am »
You haven't mentioned if you have tried removing it by the recommended way, Kev. I have never had one I couldn't get off with a bit of rod and a bolt screwed into the end.  I can't remember the length of rod needed, I think Pitman recommend a bit of old knitting needle that will just slide easily up inside the shaft, but the bit of rod on my shelf is a short length, maybe about 2", of hex. Allen key, probably a 5mm or thereabouts. A suitable BSC bolt is screwed down on top of this internal rod to break the taper joint and push the a/r shaft off when the pressure is applied with a short ring spanner.

You need to keep the rod as short as you can, to allow the bolt to grip on as many threads as possible in the cam end, and it only needs about 1/8" of movement to break the taper. It may help to warm it first if it's really stuck but a tap on the bolt head when the pressure is on should break it free.


Ray
Just a motorcyclist.

Offline Tman

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Re: c11g a/r unit
« Reply #17 on: January 06, 2019, 11:21:23 am »
Yep, using this sort of arrangement will always overcome the taper no matter how hard it's fixed in.
 1/8th to break the taper though? More like a couple of thou... ;)

Online timsdad

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Re: c11g a/r unit
« Reply #18 on: January 06, 2019, 11:54:51 am »
Yes, Mt T, but I took into consideration taking up the slack in the threads, squeezing it all up plus a bit for luck.

And we never know how good other folk are at measuring things - I don't think my missus knows the difference between a cup of tea and 3/4 of a cup of tea !


Ray
Just a motorcyclist.

Offline camman3

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Re: c11g a/r unit
« Reply #19 on: January 06, 2019, 06:28:03 pm »
Mine does Ray....if I want a full cup she says make it yourself. :-\
Graham
1957 C12
In sunny (sometimes) Christchurch, Dorset, UK

Offline kdm

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Re: c11g a/r unit
« Reply #20 on: January 07, 2019, 04:03:19 pm »
Update. Drilled out an X connector so it would fit over shaft then welded it in place. Screwed in a homemade slide hammer and off she came. This was with cam out. There was no internal thread at end of shaft/tapered cone. Have ordered a Lucas 12 degree auto unit to suit b model or Triumphs. Will see if it works, anyone done before? If not may go down the electronic route.
1954 C11g

Offline kdm

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Re: c11g a/r unit
« Reply #21 on: January 07, 2019, 04:07:57 pm »
Another pic
1954 C11g

Offline chaterlea25

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Re: c11g a/r unit
« Reply #22 on: January 07, 2019, 06:23:24 pm »
Hi,
I seem to remember that Triumph twin units are the wrong rotation ??..
Smaller taper too I think?

John

Offline kdm

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Re: c11g a/r unit
« Reply #23 on: January 07, 2019, 06:50:38 pm »
ordered one on evilbay, only £15 so if wrong not too out of pocket...
1954 C11g

Offline kdm

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Re: c11g a/r unit
« Reply #24 on: January 10, 2019, 06:17:00 pm »
ok so new (to me) auto advance arrived and yes tapered cone is too small, also roughly 10mm shorter in length.
The search for a replacement continues!
Am planning on the Lanark auto jumble early Feb so if nothing turns up there or before will get original tapered cone copied and hopefully get something workable from there.
Cheers
1954 C11g

Offline ianinglis

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Re: c11g a/r unit
« Reply #25 on: January 10, 2019, 07:15:00 pm »
unfortunately you have more chance of finding lord lucan at the lanark autojumble :-\

electronic ignition is probably the best way forward if you want it running before the end of this decade or an "electrex world" ignition system which are excellent by all accounts - speak to griff - i am sure he has experience of these units



ian
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BSA C10L 1954 - MVE 107
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BSA ARIEL 3

Offline kdm

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Re: c11g a/r unit
« Reply #26 on: January 10, 2019, 08:04:07 pm »
Do you think Lucan still has a moustache?
Electronic ignition it is then, ta
1954 C11g

Offline chaterlea25

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Re: c11g a/r unit
« Reply #27 on: January 10, 2019, 08:44:16 pm »
Hi All,
I wonder if it would work if a double tapered cone was turned up to adapt the available auto advance units
The rotation of replacement units needs to be the same as original
Does anyone have an AR for a late C15/ B25 to measure up and compare the taper?

John
« Last Edit: January 10, 2019, 08:55:58 pm by chaterlea25 »

Offline kdm

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Re: c11g a/r unit
« Reply #28 on: January 10, 2019, 09:36:32 pm »
bought a Lucas item, cone way too small. will measure at weekend if anyone wants info
1954 C11g

Offline cornish pixie

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Re: c11g a/r unit
« Reply #29 on: January 10, 2019, 11:43:23 pm »
Evening all
I have a lucas unit in my ariel colt.
I put a taper in the end of my broken shaft and turned it into an adapter.
If you go electronic then the common ones use a c15 size taper so would need an adapter anyway
Regards Martin.
here in sunny cornwall