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Magneto sprocket removal.

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Magneto sprocket removal.

Post by joegrgraham on Wed May 29 2013, 19:37

Hi all,

Any tips for removing the Magneto drive sprocket from the crank shaft of a Lister Junior?
Is it a straight key or a taper? Is it just a case of brute force with a puller or are there any subtler ways?
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Re: Magneto sprocket removal.

Post by matt86 on Wed May 29 2013, 20:19

its on a taper and normally not too tight . sometimes it been known just to unwind nut a few turns and surport the gear and a sharp tap on the nut shocks it off . notice a tap not a clout Laughing

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Re: Magneto sprocket removal.

Post by Villiers on Wed May 29 2013, 20:23

Crank shaft Matt.

This is held on with a parallel key and if my memory serves me right it is also the gear for the camshaft on the other end, it should just pull off with gentle use of a puller. Clean the shaft up well, lube it up and bingo, off it comes.
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Re: Magneto sprocket removal.

Post by joegrgraham on Wed May 29 2013, 20:45

Thanks Villiers,
yes, you memory is correct, there is a cam gear on the back.
I pulled it a few mm, then it went tight, so I stopped cause I didn't want to wind it too tight against a taper key.
As you say it's a straight key, I'll clean the keyway a bit more, give it a soak and try again.

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Re: Magneto sprocket removal.

Post by joegrgraham on Thu May 30 2013, 19:30

Had another go at it tonight, followed what villiers suggested and got the swine! Smile

Thanks Guys.

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Re: Magneto sprocket removal.

Post by matt86 on Thu May 30 2013, 21:08

after when i had the flywheel off mine just pulled off easy enough i tapped it off with a drift ... But then if stuck its a different ball game .

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Re: Magneto sprocket removal.

Post by stationary stu on Fri May 31 2013, 10:48

Great news Joe, keep us updated on your restoration please.

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