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Re: crank hardening

Subject: Re: crank hardening
From: "Jack W. Drews" <>
Date: Fri, 08 Nov 2002 18:37:19 -0600
I have my cranks nitrided by a company in Michigan that nitrides about 250 
cranks a week. They do all of Callies, Crowers, etc so it seems that they 
should know what they are doing. They use a gas ion nitriding process which 
imparts the nitrided surface through a gaseous atmosphere. The crank is 
heated to about 400 deg, sufficiently below the temp at which other grain 
transformations or hardening characteristics take place.

I can't say for a fact that the nitriding helps eliminate crank cracking 
since I know of at least one nitrided crank that broke, although the 
failure could have been partly attributed to another cause. It certainly 
helps with wear, and my nitrided camshaft shows no wear even after five 
years of use.

The last crank I did was $150. PACK IT CAREFULLY. Insure it. UPS lost one 
of mine. ouch.

Contact info:

Advance Heat Treat Corp.
1625 Rose Street
Monroe MI 48162

phone 734-243-0063

At 06:57 PM 11/4/02 -0500, wrote:
>          I have removed my stock crank to be turned and would like to do
>whatever the latest is in hardening. It has been magnafluxed and
>cryo-treated. What improvements can be done and where? A company in Ca is
>doing "wedging" of TR cranks. Is this of use? My car is a TR3.
>                                                               Dave

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