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And this is just one rubber thing that can sideline your truck. A serpentine belt letting go and taking out some radiator hoses can make a heck of a mess on the side of the road, and yeah the serpentine belt should have been replaced by dude a decade previous but it was still interesting to see it took out the hoses partially.
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I saw one better recently. Early 80's Chevy K5 Blazer, a customer's BOV, came in on the flatbed leaking oil and antifreeze. Harmonic balancer slipped off the back of the crank hub and tore open the timing cover, oil slung up and threw off all the belts which then cut both radiator hoses.
I had to try not to laugh; the guy proudly does his own maintenance and almost all of his own repairs and all the belts and hoses were in great shape, all the fluids were clean... but he didn't know enough to check the condition of the rubber in the balancer and his was obviously dry rotted. If I'd had done his belts for him I wouldn't have missed it. Knowing how to do DIY repairs on your BOV is great, but having an expert look at it once in a while for anything you overlooked can be a learning experience too. Some people don't think of that it seems.