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Antique Gas Engine Discussion

Advice please; Lister A (Junior) Engine Magneto Sprocket Removal


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  #1  
Old 01-13-2018, 11:18:33 PM
Railnthusiast Railnthusiast is offline
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Default Advice please; Lister A (Junior) Engine Magneto Sprocket Removal

Hello,

My name is Mike, please could I have some advice on removing a magneto sprocket for a Lister A engine. The sprocket goes through a cover behind the flywheel, and has a gear driving the camshaft and the fuel pump.

I have tried levering, and using a slide hammer (welding to the sprocket). Sadly, I wrecked the first sprocket, and the cover containing the valve timing gears. A lesson in learning; don't lose your temper! I removed the old sprocket using threaded rod, and cutting out the keyway. A destructive form of removal, but the sprocket was ruined by this point anyway.

Would anyone know, or know anyone else who is able to advise me on dismantling and removing the gear?

Interestingly, the second donor Lister turns (the crankshaft does) but doesn't operate the valves, they are rusted. There must be a mechanical failure with the valve gearing. I can't figure out what the issue is.

I am determined not to make the same mistakes as last time!

I will be trying to upload photographs, please bear with me.

Thanks

M
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Old 01-13-2018, 11:38:35 PM
Railnthusiast Railnthusiast is offline
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Default Re: Advice please; Lister A (Junior) Engine Magneto Sprocket Removal

1st Image is the donor engine. The weld is from a go with a slide hammer.
2nd Image is the engine the cover and sprocket is to go on.
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Old 01-13-2018, 11:41:36 PM
Railnthusiast Railnthusiast is offline
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Default Re: Advice please; Lister A (Junior) Engine Magneto Sprocket Removal

3rd Image is the broken cover
4th Image is the old sprocket showing gear and blind keyway (no head to remove key)
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Old 01-14-2018, 12:38:24 AM
sunshineman sunshineman is offline
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Default Re: Advice please; Lister A (Junior) Engine Magneto Sprocket Removal

Hi
It appears to me the spocket has been driven on to the crank too far .
My approach and my view
Crankshaft needs to be clean and free from burrs and polished all the way to the end first.
Gibb key appears to be well inside the spocket , I would drill key out then collapse whats left of the key,
Patience is the most important tool you can have in your shed.
You may need little chisels, punches , etc to collapse and remove key.
Once key is removed make sure sprocket revolves before trying to come foward.
Anger and force have no place in restoration of vintage engines, as you see with broken parts the end result.
The positive side is it is a common engine with many parts still around,
Just a point many engines have been in use for many years in poor condtion, patched up with whats available to keep them going, and then left in the open to rust away.
So you have to undo bush repairs, remove rust, etc
Stick with it be patient ask questions before if unsure
Good luck
Sunshineman
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Old 01-15-2018, 11:11:47 PM
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Default Re: Advice please; Lister A (Junior) Engine Magneto Sprocket Removal

Sunshineman, Thanks mate. I'll let you know how I go re sprocket.
But.. Whilst on the subject of Listers? Any one you know of able to supply or perhaps cast a suitable set of A model bearings?
I've been looking to make a pattern, because many A models seem to have reached the stage of needing crankshaft main bearings (in the block, not the big end). I thought it might be worth the effort. But... I can't find an original without having to remove the only good ones I have. Too risky. And a very interesting design of bearing!
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