Flywheel serrations on shim surface

[anthracitedub]

Recently took apart an engine with a light flywheel and noticed these serrations on the flywheel. Just curious if this could be an intentional machining operation or maybe strange wear pattern.... the shims looked nice.

Also, it appears to have a GE logo in an oval stamped on it, but it almost looks like it could be a GB.... possibly Berg?

[jason]

I’ve seen that before. Will help oil get behind the shims.

[rugblaster]

Looks like someone needs to dress the stone on their flywheel grinder.
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[jimmyhoffa]

Look carefully... That GE is supposed to be a GB. I have a guess as to who's initials those are.
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[anthracitedub]

I built this engine about 25 years ago... I knew it had a light flywheel, but from memory I didn’t remember what kind it was. I figured the serrated surface was probably for oil. It’s kind of neat pulling apart an engine that you built so many years back.... found a couple of mistakes😳

[Slow 1200]

if it lasted 25 years I guess the mistakes were not that important

[mark tucker]

[anthracitedub]

Well, I don’t plan on using that flywheel again anyway...didnt like it for a daily.
The engine ran really well and did what I needed it to do. The mistakes I found were piston ring gaps on two cylinders... one pistons gaps were lined up!
Also, I don’t think I spent enough time cleaning the case because there were some decent scratches on the main bearings.

I only took the engine out and apart because I switched the car back to 40hp stale air and 6volt. In effort to squirrel away the engine in boxes in my basement it all came apart... but it looks like it needed it anyway.

[rockurob]

Had to go out in my shop and look.....
I have a Gene Berg flywheel, has the same
machine marks, but not as prominent as yours.
Dug out one of my ol Gene Berg catalogues(mid 70s)
GB did not manufacture flywheels, but resurfaced/machined
genuine VW ones …. It described the swirl pattern
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[anthracitedub]

Cool, good to know 😁

[slalombuggy]

The piston rings could have just lined up over time, they move around on the piston. Crud in the bearings, after 25 years something's bound to shake loose, break off, or just plumb wear out

brad