Birfield Blueing (1 Viewer)

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Jan 28, 2010
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Bairrhea CA
Folks; seen a birfield looking like this before? right side axle seal been making a mess, just dismantled to replace. what's thoughts on returning to service?
FJ80 RS Birfield 11-08-20.jpg
 
Joined
Nov 9, 2012
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10,874
Location
Olathe, KS, USA
Folks; seen a birfield looking like this before? right side axle seal been making a mess, just dismantled to replace. what's thoughts on returning to service?View attachment 2491194
Yes, completely normal. That is surface hardening done at the factory. It is NOT overheating or damage.

Show the interior where the balls and cage are to show if there are any chips, cracks, or shattered balls.
 
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Feb 6, 2002
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OC, CA
Those are the heat marks from induction hardening of the steel. It is a localized hardening done by rapid electromagnetic heating of a spot followed by quenching and tempering. The steel outside of the spot remains softer and ductile.
 

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