1957 panhead case's

[hairynob24]

G day everyone, I have a question on the inner diameter of the crankcase for my panhead which has had a huge welding job on the broken areas , I have just found out the flywheel assembly is tight to the case's. Does anyone have any idea of the inner dimensions for clearing the flywheels please Rob

[exeric]

Are you referring to the (assembled case) width between the shoulders of the main bearing housings, Rob? If so I had that problem on a Panhead bottom end.

[hairynob24]

Yes , exeric I have been slowly finding area's that are touching, mainly left-hand case around the scraper area .have managed to get it to fit the fly wheel assembly with one bearing pressed on , but finding the case rocks side to side , it's sitting flat on the case race area ?? I only know indian not so much Harley..I did die grind area's near the welds making sure to minimise the oil scraper area, I have managed to maintain around 6" between the case and flywheels. Not sure if there's a sized gap I need or not. Painful

[dukekleman]

Rob,

You'll want to set up each crankcase half in the mill on a turn table. Find center on the properly sized case race. Machine the radius @ 4.275" - 4.300" ( Overall Diameter of 8.550" - 8.600").

I personally prefer the 8.550" Diameter. This diameter scrap's the oil off the flywheel assembly more efficiently which is less parasitic drag (loss).

I hope this helps,

Duke Kleman