Engine paint markings?

[Colibri]

Happy Sunday everyone!

I had my 22' Bronco BB serviced over 2 months ago and I thought I would detail the inside of my engine bay and remove dust/and or winter leaves and to my surprise I found a collage of colors in the engine bay. And ideas why a dealership does this? I feel like a toddler went loose. (sorry no offense to kids here)

Also, I noticed that my coolant is below the minimum mark, I haven't driven 1K since my service and I am hovering at 19,200 on the OD. I hope it's not the dreaded coolant leak.

Edna

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[Quashish]

I noticed a couple spots of blue near the sparkplug area on the valvecover. Not really sure what you mean.

 

[Major Kong]

https://www.mmcdetroit.com/ICCA/References/Inspection_Marks/Inspection_marks_1_23_2003-1.html

your post prompted me to look for myself for an answer

 

[wireman]

I think it's an assembly verification that a step has been completed and marked as such.

I have numerous blue markings I can see.

 

[Robins21]

The paint markings are for the assembly line workers. Different parts are coded with paint colors, so they know which parts go on the vehicle they are assembling at that moment according to the build sheet.

 

[Jake25]

Verification marks are made by assembly line quality inspectors.

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