What are these marks on my AC Delco parts?

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What are these marks on my AC Delco parts?

Postby deleteitall [OP] » June 26th 2013, 7:33pm

Bought a new ACDelco fan clutch for my 1997 Astro on Amazon and was wondering what the different colored yellow, purple and black spray paint marks are for. Do these colors signify that the part met a certain quality grade from the factory? Or maybe to mark where to line up the fan or water pump shaft so there is better balance - the way tires have a balancing mark?
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Re: What are these marks on my AC Delco parts?

Postby DRZ » June 26th 2013, 9:27pm

Dunno, never occurred to me to ask.
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Re: What are these marks on my AC Delco parts?

Postby markmitch » June 26th 2013, 9:29pm

only time I have ever seen that was sometimes when you buy parts they mark it to know its from them like at a pick and pull close to me. They use a paint marker to put initials of the cashier.
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Re: What are these marks on my AC Delco parts?

Postby chevymaherchevymaher is online! » June 26th 2013, 11:07pm

It is how they are marked in the parts bin at the factory. Keep similar but different parts separated. That mass production thing.
At least that is how they did it when I did factory work.
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Re: What are these marks on my AC Delco parts?

Postby godmachine81 » June 27th 2013, 6:15am

like chevymaher said, it is a mass production thing. I worked at an Automotive Trans/Oil Cooling unit factory and I can verify that we made very similar marks to specify that the item was 'tested'. Each color represents a different test, and usually different people are assigned different colors and/or a unique stamp. It helps in the factory to make sure only good parts ship.
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Re: What are these marks on my AC Delco parts?

Postby deleteitall [OP] » June 29th 2013, 6:50pm

Ok thanks guys that's good to know.
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