'58 Lark Flywheel threads bead?

[DavesInvader]

The threads for the flywheel on my 58 Lark have what looks like a small bead of welding near the bottom of the threads. It's about the size of the head of a shirt pin. I'm wondering if this is done in production to set the depth of the nut/flywheel? Or is this the result of some sloppy repair work from the PO? Any ideas? Should I try to chisel of file it off? I haven't touched it yet, thought I would check here. Picture attached.
Thanks!

 

[F_R]

Re: '58 Lark Flywheel threads bead?

The threads for the flywheel on my 58 Lark have what looks like a small bead of welding near the bottom of the threads. It's about the size of the head of a shirt pin. I'm wondering if this is done in production to set the depth of the nut/flywheel? Or is this the result of some sloppy repair work from the PO? Any ideas? Should I try to chisel of file it off? I haven't touched it yet, thought I would check here. Picture attached.
Thanks!

Can't tell, it looks like it might be the metal that was pushed up by the threading tool. Is it at the end of the last thread?

Put the flywheel on the shaft. If the bump in question is below the surface, the nut won't touch it anyway.

Clean and shine up that shaft and flywheel taper before installing the flywheel. Then install it dry and torque the nut to 60-65 ft/lbs.

 

[DavesInvader]

Re: '58 Lark Flywheel threads bead?

I know what you're saying by metal that was pushed up by the threading tool. I've made threads on pipe and seen what you're talking about but I don't think that's it. It is about two or three threads from the bottom and it is a little round bead, like a piece of welding slag. I'm assuming then most flywheel threads do not have something like this?

When I put the flywheel on it is about 1/8" below the top surface of the flywheel without tightening the nut down, so it may or may not be above it when it's all snugged down.

Can I use some fine sandpaper to clean the shaft? I've used carb cleaner on it and it took of some of the grime but not all. Also, should the flywheel key come off loosely? This one is stuck in the slot tight.

 

[F_R]

Re: '58 Lark Flywheel threads bead?

I know what you're saying by metal that was pushed up by the threading tool. I've made threads on pipe and seen what you're talking about but I don't think that's it. It is about two or three threads from the bottom and it is a little round bead, like a piece of welding slag. I'm assuming then most flywheel threads do not have something like this?

When I put the flywheel on it is about 1/8" below the top surface of the flywheel without tightening the nut down, so it may or may not be above it when it's all snugged down.

Can I use some fine sandpaper to clean the shaft? I've used carb cleaner on it and it took of some of the grime but not all. Also, should the flywheel key come off loosely? This one is stuck in the slot tight.

Heck, I don't know, maybe it IS slag. Certainly not normal
Yes, sandpaper is fine. Yes, the key is supposed to be a tight fit in the slot. In fact you have to tap it in with a hammer. Remove it by grabbing it with a pair of dikes (diagonal cutters) and lever it out.