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Questions on checking 400 heads for cracks


 
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Nick@KY
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Joined: 05 Mar 2009
Posts: 441


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PostPosted: Wed Jul 14, 2010 11:59 am    Post subject: Questions on checking 400 heads for cracks Reply to specific post Reply with quote

I am going to check a couple of 400 heads for cracks.I've been told that they usually crack in 2 places between the valves.
I have die penetrant/develpoer that I can use,is this as reliable as magnafluxing? Thanks Nick
 
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JGarner
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Joined: 03 May 2004
Posts: 2276


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PostPosted: Wed Jul 14, 2010 12:59 pm    Post subject: Re: Questions on checking 400 heads for cracks Reply to specific post Reply with quote

My opinion, but yes they are equvalent in crack or inclusion finding.

Having worked in and around a large machine shop all of my career I have seen both used. We also used x-ray and ultra sonic testing.

Die Pen was used on non ferrous, non magnetic materials.

Mag particle on alloy steel, cast iron, etc.

x-ray on open root welds

UT on bar stock to find cracks and voids that would surface during machining.

If you have die pen ability make sure the heads a squeaky clean because residual oil will mask problems.

Jim
 
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