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Have you noticed all the little markings on the engine with the different color markers? I guess they were checking to make sure each part was installed correctly.
 

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Have you noticed all the little markings on the engine with the different color markers? I guess they were checking to make sure each part was installed correctly.
Have not noticed the marks on the engine, but see the yellow ones on the frame and on and bolts. Maybe they mark them after they are properly tightened?
 

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Have not noticed the marks on the engine, but see the yellow ones on the frame and on and bolts. Maybe they mark them after they are properly tightened?

In theory yes, but I've seen seat assemblers mark 'em before they torque 'em! If the assembler misses one, the seat moves on, then the torque gun is 'off-count' for the next seat and has to be reset. The worker then doesn't remember what he did, so not one but two seat sets have to go to rework to get everything sorted out in time to get sequenced back in for shipment to the auto assembly plant. I can only imagine what a pain this little oversight would be on truck frames should it happen......
 

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Pop the top on your fuse panel under the hood - there are similar marks at each location where a fuse or relay goes - both the ones for the things installed on your truck - and the ones you don't have.
 
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