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Old 08-04-2011, 09:54 AM   #1
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2 cranks both the same color blue

I have a 2.5L SVT contour motor, and picked up a second crank. Took them to the machine shop to see which one was better, well both have this blue coloring too them, kinda like a chrome header after it gets hot, but both have what look to be water spots in the blue color. The machine shop said it could be because both have gotten too hot.

Is that the case? Could this be because both engines this crank come from could have overheated majorly, or is this because of the hardening process the SVT contour cranks supposedly went though?

the one engine I actually own, had a little oil starvation problem and spun a bearing, the other crank came from ebay (the seller said it was from a wrecked car, he could have lied) The color is only on the flanks and isn't consistent.

I am just worried the flanks have become warped, but the crank is all within spec. according to the machine shop, but they said they could not check to the flanks

what do you think?


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Old 08-04-2011, 10:04 AM   #2
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pics?

to me sounds like they spun a bearing or something got hot.

are the journals still round and not scorred?
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Old 08-04-2011, 11:25 AM   #3
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pics?

to me sounds like they spun a bearing or something got hot.

are the journals still round and not scorred?
Ill get pics when I get the crank back, and tear down the other one (for the 2nd time)

The ebay one the journals, look so good they might not need to be polished, the one that I have in the motor, had very minor damage.
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Old 08-04-2011, 02:13 PM   #4
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its most likely overheated. when something is discolored blue, especially something as solid as a crankshaft, its been run wayy too hot.
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Old 08-04-2011, 03:55 PM   #5
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It's from the hardening process / heat treating.
He's talking the counterweights, not the mains/journals.
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