Mag sprocket removal

Hi George,

   I have found the quickest way is to loosen these is to put a wooden wedge between the mag front cover and the back of the chain case, then put the tight curved end of a tyre lever behind the sprocket and give it a sharpe shove. The best type of lever is the 1" wide type with one flat end and the other with a 90 degree curve.

Hi George

A suitable tool is described in PL Garratt's Norton book, chapter 4/p67/Fig3. This is a DIY or blacksmith made tool, I don't recall seeing anything like this offered for sale. My mag chain has a split link so I remove that and use a compact 2 leg puller.

Cheers, Ian McD

I have a small two-leg puller that fitted without grinding. A Kukko, I think.

Get a puller iv lost count of the number of timing cases iv seen ruined by other methods .The best way is to protect the mag shaft and apply gentle pressure on the puller while tapping the end of the puller and increasing pressure slowly I will dig my puller out out and see what make it is but I would have thought someone like Wassel would have one.

... is what happenes to timing covers when levered. This is off the 1931 Sunbeam I rebuilt some years ago - broken and repaired many years before it came to me. Spares for this model being all but unobtainable I tidied up the fishplate arrangement but it's not ideal.

A wooden block sounds very risky unless you happen to have some lignum vitae (extra hard...)

I use a two legged puller with tips ground as little as possible and, if it has to pull against the chain, so be it. Easier to replace a chain than the case.

I made the factory tool but didn’t get the tip right. I use a two leg system made up of a right angle bolt to sit under the chain and a pan head bolt to fit under the sprocket tight to the base of the teeth ( directly opposite each other).   With a stiff bar between resting on the loosened central nut, a bit of equal tension on the nuts ( try it with a light setting torque wrench to keep it even) and a tap over the central nut and ping,  it’s off…

When tightening, “sprag” the two sprockets with a light bar diagonally between the two sprockets to hold things in place.

Jon

I have got two but cant remember which one I used I think it was the two leg one which is a pickavent  no 219 but I would check what draper tools have but don't risk the timing case and I have always used a split link in the timing chain with no problems even when vintage racing 

                                                                                            happy new year