6V crank 12V flywheel

Ryan · Post by **Ryan** » Sun Dec 16, 2012 9:34 pm

I have a 66 beetle with original 1300. The previous owner converted it to 12V. Last week when my clutch went out I found I still had a 180mm flywheel. I bought a new 200mm clutch kit and flywheel. My question is....can I machine the new flywheel at the opening to 55mm so it will fit over the early 6V crank? The early crank has a step up from around 53.5mm to around 55mm, just 5mm from the end. The late crank doesn't step up till around 9mm from the end so the late flywheel will bottom out on the early crank before its seated on the bearing. I figure if I machine the opening to fit over the crank it won't hurt any thing, assuming my end play is set right. Am I correct in my way of thinking? I am not an engine builder and I don't want to ruin my motor. Thank you for any assistance.

Blue Baron · Post by **Blue Baron** » Thu Dec 20, 2012 12:31 am

On my '66 1300 engine, the 200 mm O-ring flywheel was a direct swap, because the 1300 and later engines all had the same 69mm crank.

Are you certain it's a 1300? (F case)

Ryan · Post by **Ryan** » Fri Dec 21, 2012 2:27 am

I'm sure it's an F case, but I'm not sure if it has been rebuilt. The crank for sure has a short step up to 54.69mm. I ended up machining a 200mm o-ring flywheel to 55mm just in front of the o ring. It slipped over the cranks step up perfectly. I set the end play to 3 thousandths of an inch and every thing seems perfect now. The only thing is...now my automatic starter is grinding a little when starting. It didn't do that before.

Ryan · Post by **Ryan** » Fri Dec 21, 2012 8:36 pm

I figured the starter noise out. The starter is staying engaged for a second after the engine starts. This could be caused by the teeth on the fly wheel having little burrs on the edges keeping the starter on the flywheel too long. But if any one is having trouble matching a 12V flywheel to an early 6V crank you can make it fit perfectly with a little machine work on the flywheel opening.

Blue Baron · Post by **Blue Baron** » Wed Jan 09, 2013 4:07 pm

You can take the engine back out and file off the burrs, or try a heavy coat of grease on the starter gear.

Ryan · Post by **Ryan** » Fri Jan 11, 2013 1:49 am

Why not grease the fly wheel teeth too? I'm pulling the motor to install noise dampening kit anyway, so ill try what you said.