The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => Lucas, Ignition, Charging, Electrical => Topic started by: Marqs1979 on 28.08. 2016 12:34

Title: Oil in the k2f magnet
Post by: Marqs1979 on 28.08. 2016 12:34

Hi !

I got problem with oil in the magnet. The seal is not old but i fond the chaft worn. I have grind the chaft some and would like to grind it more but i am afraid that if i take too much the seal becomes too big.
Is there a seal that i can use with smaller inner diameter ?

Regards/Markus

Title: Re: Oil in the k2f magnet
Post by: BSA_54A10 on 29.08. 2016 11:19

Go to a bearing shop and see if there is a "Speedy Sleeve" in a size suitable for your shaft.
Then simply ( it is reasonably easy ) slip the sleeve over the shaft , restoring a nice smooth surface for the seal to run on

Title: Re: Oil in the k2f magnet
Post by: Marqs1979 on 29.08. 2016 18:49

I 've been thinking the same thing , it 's just a little crowded space . I do not want to destroy the cone for the auto -advance unit.

(https://www.a7a10.net/forum/proxy.php?request=http%3A%2F%2Fforumbilder.se%2FFAPV7%2F20160829-194002.jpg&hash=81411b8e26d821de1dac26514f39e5a8d4f45c19)

Title: Re: Oil in the k2f magnet
Post by: groily on 29.08. 2016 23:19

It is a problem marqs.
It would I think be possible to machine the top part of the taper to 'parallel' and then press/shrink on a collar or sleeve which could then be turned to make a perfect continuation of the original taper. A rather fiddly job, but I'd say it was probably do-able without significantly reducing the strength of the shaft or its fit into the brass end cheek - or wrecking the fit of the ATD.
Good luck!

Title: Re: Oil in the k2f magnet
Post by: Marqs1979 on 30.08. 2016 20:09

I have decided to make an effort , I'm working with a lathe and have access to all the equipment that might be needed.

Title: Re: Oil in the k2f magnet
Post by: beezermacc on 30.08. 2016 20:48

This sounds like more trouble than it is worth. Second hand armatures regularly sell on Ebay for about £25. Furthermore the windings look original. If the capacitor is original as well I wouldn't rely on this magneto to get me very far.

Title: Re: Oil in the k2f magnet
Post by: Marqs1979 on 30.08. 2016 20:57

Quote from: beezermacc on 30.08. 2016 20:48

This sounds like more trouble than it is worth. Second hand armatures regularly sell on Ebay for about £25. Furthermore the windings look original. If the capacitor is original as well I wouldn't rely on this magneto to get me very far.

You are right ☺ but its fun to fix things :)
I use easycap capitator.

Title: Re: Oil in the k2f magnet
Post by: Marqs1979 on 01.09. 2016 08:51

I have started the project.

(https://www.a7a10.net/forum/proxy.php?request=http%3A%2F%2Fforumbilder.se%2FFB0VT%2F20160901-092445.jpg&hash=042845a74fed31ddc9da2a55eb4541f68c166792)

Title: Re: Oil in the k2f magnet
Post by: Marqs1979 on 01.09. 2016 21:19

(https://www.a7a10.net/forum/proxy.php?request=http%3A%2F%2Fforumbilder.se%2FFB10A%2F20160901-193635.jpg&hash=291754b5cda6bd8141ef0cae717e7dcc684d7048)

Title: Re: Oil in the k2f magnet
Post by: trevinoz on 01.09. 2016 22:13

Might have been a good idea to have removed the bearings first. At least the cage and balls.

Title: Re: Oil in the k2f magnet
Post by: Marqs1979 on 04.09. 2016 19:37

Now the engine runs again . The future shows if the repair works.

Title: Re: Oil in the k2f magnet
Post by: kiwipom on 04.09. 2016 23:33

hi guys, how true,cheers

Title: Re: Oil in the k2f magnet
Post by: Marqs1979 on 27.08. 2017 18:26

Hey !

The repair still works after about 3000 kilometers, no oil in the magnet. *smile*