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visual way to tell if a crankshaft has been nitrited besides the &
Posted by: toms73novass ()
Date: February 26, 2018 01:59PM

If a crank has be re nitrited after being turned down .010 is there any way to verify. Visual difference? Hardness test?

I was going to check out some parts that were suppose to be part of an airplane engine build and the crank was suppose to be re nitrited. No paperwork to verify.

Thoughts?

-Tom


63' Monza Spyder Convertable (in process) MY Build Thread
73' NovaSS 454 Big block
86' BMW 325es
98' Dodge 2500 12v Cummins Diesel with 1200 lb torque!
98' VW Jetta TDI, for daughter
01' Audi Allroad Stage 3 twin turbo

NFCC
Grand Island, NY

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Re: visual way to tell if a crankshaft has been nitrited besides the &
Posted by: jjohnsonjo ()
Date: February 26, 2018 02:23PM

[corvaircenter.com]

Vairmech had a suggestion about a month ago

J.O.

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Re: visual way to tell if a crankshaft has been nitrited besides the &
Posted by: toms73novass ()
Date: February 26, 2018 06:19PM

Thanks for the link! thumbs up

-Tom


63' Monza Spyder Convertable (in process) MY Build Thread
73' NovaSS 454 Big block
86' BMW 325es
98' Dodge 2500 12v Cummins Diesel with 1200 lb torque!
98' VW Jetta TDI, for daughter
01' Audi Allroad Stage 3 twin turbo

NFCC
Grand Island, NY

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Re: visual way to tell if a crankshaft has been nitrited besides the &
Posted by: vairmech ()
Date: February 26, 2018 06:23PM

If the parts are not yours the owner would not like my method! Especially an airplane guy.

What you can do is lightly take the edge of a knife and scrape it sideways across a journal, if it is nitrided there will be almost no tell tale sign and the knife will glide across the journal. If it is not nitrided there will be a small mark and the knife will drag noticeably.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: visual way to tell if a crankshaft has been nitrited besides the &
Posted by: Brizo ()
Date: February 26, 2018 06:32PM

In addition to the knife test, a nitrided crank will have a gray appearance, almost like a very thin coat of metallic gray paint. The journals will have a gray tint compared to a more chrome color on a standard crank.

Dan Brizendine,
'64 8door Greenbrier 140 PG. "In beautiful Wanamaker Indiana...with one stop light and 5 pizza shops"

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Re: visual way to tell if a crankshaft has been nitrited besides the &
Posted by: Vairismo ()
Date: February 26, 2018 06:56PM

The crankshafts I had nitrided had a higher pitched ring when you struck them with another piece of metal. Maybe not useful to your question, but thought I'd put it out there.

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Re: visual way to tell if a crankshaft has been nitrited besides the &
Posted by: toms73novass ()
Date: February 27, 2018 07:12AM

The knife trick worked like a champ on one of my known nitrated cranks. Left a mark on the crank and wiped off with my finger. On the normal crank the mark did not wipe off.

-Tom


63' Monza Spyder Convertable (in process) MY Build Thread
73' NovaSS 454 Big block
86' BMW 325es
98' Dodge 2500 12v Cummins Diesel with 1200 lb torque!
98' VW Jetta TDI, for daughter
01' Audi Allroad Stage 3 twin turbo

NFCC
Grand Island, NY

Options: ReplyQuote


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