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Old 06-08-2015, 10:52 AM   #1
BRENT in 10-uh-C
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Join Date: May 2010
Location: Eastern Tennessee
Posts: 11,517
Default Understanding Crankshaft journal hardness

I am trying to work thru an issue, and so I have been comparing an aftermarket crankshaft in an engine we are working on to what the manufacturer says the hardness should be, ...and to what the original print says it was.

He is what I have so far;

The aftermarket crankshaft manufacturer gave me these specs for their crank:

......Web hardness 260-320

......The main and rod journals nitridation hardened to HV>500


The Ford crankshaft prints I have say:

......Heat Treatment:
......Heat Treat to 1560° F. Hold for 30 minutes
......Cool to 1200° F. in 30 minutes
......Air cool to room temperature - Brinell 149-179
......Center on the 3 main bearings and rough machine
......Heat to 1500° F. A Quench in Caustic Solution
......Anneal at 650° F. to meet a Brinell of 402-444
......Re-anneal Front End as indicated (Brinell 302-364)
......Brinell hardness of Flange from 228 to 402-444 as indicated
......Finish machine and grind.

So, ...in language I am familiar with, how do the two compare?

Also, does any of that tell how deep the treating is into the journal??

......
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