re: Old Toyota Tundra/sequoia, timing belt.

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Inspect the belt for wear man... frayed edges or slack - change it

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By the time you've pulled the parts to properly inspect the belt you may as well change it out. Along with the idler pulleys, cooling fan hub, cam seals, etc. The belts on these motors won't give you any warning before they fail, the just break. Every 90K and you'll be surprised how much smoother and quiter a new belt makes those engines run.