Detecting cracks in cylinder heads
Turbo Mini Forums

Hey guys,

what solution do you use to detect cracks in heads? ive seen there is a few kits out there, but im sure i read somewhere that you could use a mixture of household products, any ideas?

Cheers
Chris

1972 998 TURBO SLEEPER

i would take it to your local machine shop ....it they are good they place it on a UV lamp with dypen,

or borrow you mums glasses you will see the crack......lol

Cheers i'll dig out me magnifying glass lol

1972 998 TURBO SLEEPER

get the chambers blasted. They will be easy to see afterwards.

Blasted:





They can still be VERY hard to find. I'd bring the head to someone with a trained eye.

Thanks guys, ive convenantly got a Micro Grit blaster at work which will bring those chambers up a treat

1972 998 TURBO SLEEPER

If your anywhere near doncaster anytime or can cover postage both ways I can do this for you free of charge.

Edited by bennyy on 8th Nov, 2011.

Audi s4 b5 - 470bhp & 486ft lbs

On 30th Apr, 2012 Brett said:
yeah stick the bit in and give it a wobble

Blasting or crack detection?

If something is worth doing, it's worth doing half of.

Crack detection john.

Audi s4 b5 - 470bhp & 486ft lbs

On 30th Apr, 2012 Brett said:
yeah stick the bit in and give it a wobble

I think John knows where his crack is...

As for the household methid, there is a very old fashion technique called the oil and whiting method, its very similar to the modern day dye penetrant inspection, just much less sensitive, oil is applied to the surface being tested and left to penerate the fine surface breaking defects, the excess surface oil is removed and a chalk powder is applied, which works as a blotting agent and creates a bleed out, obviously I can do a much better job with modern consumables, or could be done by magnetic particle.

Audi s4 b5 - 470bhp & 486ft lbs

On 30th Apr, 2012 Brett said:
yeah stick the bit in and give it a wobble

Cheers for the offer Bennyy but sadly Oxford is no where near Doncaster. I'll have a good going over with the magnifying glass. I plan to have some work done at Rob Walker Engineering as its local so will get him to double check it
thanks again though

1972 998 TURBO SLEEPER

Not a problem mate.

Audi s4 b5 - 470bhp & 486ft lbs

On 30th Apr, 2012 Brett said:
yeah stick the bit in and give it a wobble

Here's a casting I scrapped this morning, non of these cracks were visible to the naked eye, no matter what the surface condition is, nor will you see them with a magnifying glass, if just given a visual inspection this would of passed exept a few areas of porosity, look what dye pen. Has found.




This is why I suggest.you get it checked properly.

Audi s4 b5 - 470bhp & 486ft lbs

On 30th Apr, 2012 Brett said:
yeah stick the bit in and give it a wobble

You missed one in the bottom

Looking at that, I'll be bring you my head casing one day...

The one at the bottom is just a lump of sand that absorbs the dye

Not a problem Andy, I owe you a few favours anyway

Audi s4 b5 - 470bhp & 486ft lbs

On 30th Apr, 2012 Brett said:
yeah stick the bit in and give it a wobble

Cheers bennyy for the post that really does make you think.

1972 998 TURBO SLEEPER