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Terry Burtz, Calif · 01-04-2019, 10:50 PM

The journals are no harder than the remainder of the crankshaft. Reducing them to Model A size won't hurt anything other than reducing the strength of the crankshaft. They don't need to be harder than the Babbitt in the cylinder block.

I don't have the Model B print of the crankshaft, however I am guessing that it is similar to the Model A crankshaft.

I have the Model A crankshaft drawing (A-6303), and the following is the exact wording on the drawing of the heat treatment note.

Heat Treatment
Heat to 1560 deg F. Hold for 30 minutes. Cool to 1200 deg F in 30 minutes. Air cool to room temperature. Brinell 149-179. Center on the 3 main lines bearings & rough machine. Heat 1500 deg F & quench in caustic solution. Anneal at 650 deg F to meet a Brinell of 408-444. Re-anneal front end as indicated (Brinell 302-364). Brinell hardness of flange from 228 to 402-444 as indicated. Finish machine & grind.

01-04-2019, 10:50 PM	#23
Terry Burtz, Calif Senior Member Join Date: May 2010 Location: Campbell,CA, USA Posts: 320	Re: Best Rear Main Seal The journals are no harder than the remainder of the crankshaft. Reducing them to Model A size won't hurt anything other than reducing the strength of the crankshaft. They don't need to be harder than the Babbitt in the cylinder block. I don't have the Model B print of the crankshaft, however I am guessing that it is similar to the Model A crankshaft. I have the Model A crankshaft drawing (A-6303), and the following is the exact wording on the drawing of the heat treatment note. Heat Treatment Heat to 1560 deg F. Hold for 30 minutes. Cool to 1200 deg F in 30 minutes. Air cool to room temperature. Brinell 149-179. Center on the 3 main lines bearings & rough machine. Heat 1500 deg F & quench in caustic solution. Anneal at 650 deg F to meet a Brinell of 408-444. Re-anneal front end as indicated (Brinell 302-364). Brinell hardness of flange from 228 to 402-444 as indicated. Finish machine & grind.