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Lucas E3l Dynamo to timing cover - HOW? #667814
09/16/16 4:15 pm
09/16/16 4:15 pm
Joined: Jan 2014
Posts: 436
Geneva, Switzerland
BrettF Offline OP
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BrettF  Offline OP
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Joined: Jan 2014
Posts: 436
Geneva, Switzerland
Hi folks,

On the T110 that I am working on I am a bit confused as to how the Dynamo should correctly mount to the timing cover. Part of the confusion is the following: I have two drive covers. One seems to be original with the stud protruding and the other seems to have a larger central mounting hole, I am not sure of this was drilled by a later owner or is an alternative.
[Linked Image]

The manual shows this picture below which seems to show the smaller stud with a shouldered/domed nut (of which I can find no reference number)
[Linked Image]

Does this mounting below look correct (diameter of the hole in the timing cover(5/16) is much larger than the dynamo stud diameter 3/16)).
If so does anyone know the part number for the nut that fits over the end of the stud and secures the dynamo from the timing cover side? Is there a spacer that fits over the stud to take up the space around the stud in the timing cover?
[Linked Image]

The following two pictures show the timing cover with the dynamo drive end cover with the larger (drilled out?) hole. Looking at these two pictures, it seems as though the hole in the dynamo drive end matches the hole size in the timing cover.
Is is possible that the dynamo drive end cover AND the timing case hole have been enlarged?

[Linked Image]

[Linked Image]

Is there possible just a larger 5/16 square headed bolt that fits through from the magneto end with a dome nut on the timing cover?

Any insights greatly appreciated.

Brett


3D TV: A format that lost a format war without even having an opponent.
Bikes: '69 T120 on average (1967 rolling frame and 1971 Bonnie engine) + '56 1/2 T110 on average (58 rolling frame - with 55 iron head engine)
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Re: Lucas E3l Dynamo to timing cover - HOW? [Re: BrettF] #667848
09/16/16 8:07 pm
09/16/16 8:07 pm
Joined: Aug 2001
Posts: 7,333
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Jon W. Whitley Online content

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Jon W. Whitley  Online Content

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The nut that you need is a 2BA nut part number E2228. Yes, it is small.

From the British Only website:

01-70-2228

NUT,2BA,DOME,DYNAMO

Suggested Price - $8.27 Web Price - $6.20 Used - $4.96



And the stud:


01-70-2414

STUD,2BA X 1-3/4 ,DYNAMO FIXING

$4.47 $3.35 NA




Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project

Re: Lucas E3l Dynamo to timing cover - HOW? [Re: BrettF] #667851
09/16/16 8:52 pm
09/16/16 8:52 pm
Joined: Jul 2006
Posts: 908
newcastle australia
trevinoz Offline
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trevinoz  Offline
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newcastle australia
Brett, when you fit the generator, don't over tighten the dome nut or you will end up with an end plate with a large hole.

Re: Lucas E3l Dynamo to timing cover - HOW? [Re: trevinoz] #667870
09/17/16 3:40 am
09/17/16 3:40 am
Joined: Jan 2014
Posts: 436
Geneva, Switzerland
BrettF Offline OP
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BrettF  Offline OP
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Posts: 436
Geneva, Switzerland
DOH, there the nut is on the engine parts diagram!!!!

Thanks folks.

It would appear as though the previous owner not only drilled ou the dynamo drive end cover but also the primary case. see picture below.

Can anyone measure a good case and let me know what the diameter of the hole should be. I am thinking of pressing in a tube to close up that hole where it is broken through to the inside of the primary case, which looks like a oil leak waiting to happen.

Any other ideas? has anyone else had to deal with this before?
[Linked Image]

Thanks

Brett


3D TV: A format that lost a format war without even having an opponent.
Bikes: '69 T120 on average (1967 rolling frame and 1971 Bonnie engine) + '56 1/2 T110 on average (58 rolling frame - with 55 iron head engine)
Re: Lucas E3l Dynamo to timing cover - HOW? [Re: BrettF] #667873
09/17/16 4:35 am
09/17/16 4:35 am
Joined: Jul 2007
Posts: 899
Tasmania - Gateway to Antarcti...
Tasman Offline
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Tasman  Offline
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Tasmania - Gateway to Antarcti...
My dynamo and crankcase are the same with a 1/4" UNC bolt with modified head used in place of the 2BA bolt and nut. It isn't pretty but it works although it does let a little oil through to the inside of the dynamo. I just live with it as it doesn't sem to affect the charging at all.


"Live the life you love, find a god you trust and don't take it all too seriously"

Pre-units rule!

Mid fifties Triumph T100
Re: Lucas E3l Dynamo to timing cover - HOW? [Re: BrettF] #668016
09/18/16 9:51 am
09/18/16 9:51 am
Joined: Jul 2006
Posts: 451
Kent, UK
N
Nick_Smith Offline
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N

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Posts: 451
Kent, UK
The hole in the timing cover is 1/4".

The small domed nut (3/8" A/F) has a section which is just under 1/4" diameter and 3/16" long which goes into the timing cover, to locate the dynamo via the stud on the end cover.

If you can get an original or repro nut (no idea of the part number), you could add a tube into the timing cover as you state, with a hole drilled to suit the small extension on the nut. Or - make both items if you're able to.

N


"1967 TR6R"
Re: Lucas E3l Dynamo to timing cover - HOW? [Re: BrettF] #668086
09/18/16 10:31 pm
09/18/16 10:31 pm
Joined: Jan 2014
Posts: 2,261
South cone
R
reverb Online content
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reverb  Online Content
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South cone
...that system is not a good design. No matter what hole or nut do you have there if you crank up the rpms the dynamo cannot hold it. I loosed the dynamo several times, falling parts down the road etc then one day I decided to get rid of the dynamo and just blank there; so now I rely only in the battery; but I disconnected the voltage regulator and put a 12V battery and just that in my older 500cc.

Re: Lucas E3l Dynamo to timing cover - HOW? [Re: BrettF] #668090
09/18/16 10:52 pm
09/18/16 10:52 pm
Joined: Jan 2007
Posts: 554
Queensland, Australia
T
Tiger100 Offline
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Posts: 554
Queensland, Australia
Did you have the dynamo strap in place as well mate?


Regards

Grant
Re: Lucas E3l Dynamo to timing cover - HOW? [Re: Tiger100] #668098
09/19/16 1:39 am
09/19/16 1:39 am
Joined: Aug 2001
Posts: 7,672
scotland
triton thrasher Offline
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scotland
Originally Posted by Tiger100
Did you have the dynamo strap in place as well mate?


Yes- that stud and nut only pulls the dynamo onto the gasket.

The steel strap over the dynamo holds it onto the engine.



Amateur Loctite enthusiast.
Re: Lucas E3l Dynamo to timing cover - HOW? [Re: Tiger100] #668182
09/19/16 8:41 pm
09/19/16 8:41 pm
Joined: Aug 2001
Posts: 7,333
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Jon W. Whitley Online content

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Originally Posted by Tiger100
Did you have the dynamo strap in place as well mate?



[Linked Image]


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project

Re: Lucas E3l Dynamo to timing cover - HOW? [Re: BrettF] #668276
09/20/16 4:49 pm
09/20/16 4:49 pm
Joined: Jan 2007
Posts: 554
Queensland, Australia
T
Tiger100 Offline
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Tiger100  Offline
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Queensland, Australia
Hey Jon, yeah ask me how I know eh ☺️.


Regards

Grant
Re: Lucas E3l Dynamo to timing cover - HOW? [Re: Tiger100] #668298
09/20/16 8:26 pm
09/20/16 8:26 pm
Joined: Aug 2001
Posts: 7,333
Vermont
Jon W. Whitley Online content

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Jon W. Whitley  Online Content

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Posts: 7,333
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Originally Posted by Tiger100
Hey Jon, yeah ask me how I know eh ☺️.



Ha ha ha Grant....I already know !


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project

Re: Lucas E3l Dynamo to timing cover - HOW? [Re: Jon W. Whitley] #668343
09/21/16 7:52 am
09/21/16 7:52 am
Joined: Jan 2007
Posts: 554
Queensland, Australia
T
Tiger100 Offline
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Tiger100  Offline
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T

Joined: Jan 2007
Posts: 554
Queensland, Australia
Originally Posted by Jon W. Whitley
Originally Posted by Tiger100
Hey Jon, yeah ask me how I know eh ☺️.



Ha ha ha Grant....I already know !


blush beerchug


Regards

Grant

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