heat treating a cooey extractor

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Grizzly Adams

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So I sourced a replacement Cooey single shot extractor, which turned out to be an investment casting of questionable quality. It came with a warning about a breakage possibility and I was very careful installing it, surprised that it bent and is now loose. . Obviously no spring quality there. Can I salvage it by heat treating ?

Grizz
 
I've heat treated springs by heating them in "low light", not dark but in shadow, to dull red hue, then dropping them into non synthetic oil at room temperature.

This will work, if the material your spring is made from will take on a bit of carbon from the oil and still retain some of its maleability.

Be careful NOT to heat it to BRIGHT RED.

I have a hot plate that I set a small cast iron plate I have onto and the spring in the plate.

This plate is appx .050 thick and transfers heat extremely well and the rings of the element are visible in the low light, to ensure proper placement of the spring for even heat, which is critical.

The hot plate gives me good control.
 
mbogo3 said:
I've got a 1/2 dozen of those crappy springs
Click to expand...

Have you tried to heat treat them??? I was successful for a couple that I had on hand, with the method I described.

They haven't broken yet, but the one I installed without treatment did break very soon after.
 
No I haven't ...........threw them in my parts drawer for now. Would vegetable or canola oil work or are you referring to automotive?
 
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