Questions on checking 400 heads for cracks

Nick@KY · Jul 14, 2010

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

JGarner · Jul 14, 2010

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

Questions on checking 400 heads for cracks

Nick@KY

Member

JGarner

Well-known Member

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