RE: nitriding question

["Jeff Greenfield" <alfaguy@xxxxxxxxxx>]

Andrew -

My understanding is that the (2000) crankshafts are in fact hardened by a
process called Nitriding. Supposedly, this is only a few thousandths deep,
so by grinding the crank .010" under, you will remove the hardened outer
surface.

I was once told if you go through it completely, you can use the crank that
way without a problem. Personally I wouldn't do this.

A crankshaft can be re-hardened. I've had this done in the past, usually
they are sent out somewhere to have this done. When they return they need to
be checked for straightness as sometimes the process will cause them to warp
slightly. A well equipped automotive machine shop familiar with the process
should not have any trouble with all this. In addition, I believe that it
may need to be polished after the process as well.

I have no idea how to tell if one has been re-hardened after grinding.

Or I could be completely wrong about all this ... I am not metallurgist, nor
do I play one TV.

Jeff

-----Original Message-----
From: owner-alfa@domain.elided [mailto:owner-alfa@domain.elided] On Behalf Of
Watry, Andrew (LNG-SFR)
Sent: Monday, March 31, 2003 1:19 PM
To: 'alfa-digest@domain.elided'
Subject: nitriding question

As I understand it, Alfa 2000 cranks are nitrided.  If a crank is ground
.010" undersize, have you lost the nitriding?  Could it have been
re-nitrided after grinding? How can a layperson tell either way the status
of the surface of a ground crank, if at all?  Thanks

Andrew Watry
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