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3. When it makes you uncomfortable to drive the car because you are worried it might break.
That is pretty much it for me. I am aware that belt could last 50K miles or 300K miles. You never know. However I would not be in a hurry to put a lot of money into a truck with that high of mileage. The way my luck runs, the transmission would poop out the next week (or something even worse) and I would scrap it.
What does your user manual say? If it's cracked, frayed you're way overdue. It's cheaper to replace it than if it breaks and you end up needing a new engine.
You should have tensioner with marks pointing if belt is still good or stretched. Either a pointer on tensioner and 2 bars on it's housing or two triangles. Space between them is when belt is good. If tensioner pointer is outside the "stretched" mark, you need to replace the belt.
What does your user manual say? If it's cracked, frayed you're way overdue. It's cheaper to replace it than if it breaks and you end up needing a new engine.
I thought we were talking about a serpentine belt. Does the F150 have belt driven timing?
I thought almost all modern cars have a serpentine belt.
Me too, but wit-nit said something about wrecking the engine, which would be a timing belt. Serpentine belt does not wreck an engine when it breaks unless you keep driving for a long time with no water pump. But, since you lose you power steering too, it is not likely anyone would keep driving that long. (Not to mention the various idiot lights flashing on your dash
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