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The timing belt controls the camshafts in your engine, opening and closing valves at just the right time for smooth operation. It's a part of the internal combustion engine, and has teeth that turn the camshaft in time with the crankshaft.
How Does it Work?
The timing belt synchronizes the rotation of the crankshaft and the camshaft so that the engine's valves open and close at the proper times during each cylinder's intake and exhaust strokes.
How is it Made?
A timing belt is typically rubber with high-tensile fibers running the length of the belt as tension members.
Due to the degrading of rubber in hot climates, belts are made of temperature resistant materials.
Made with curved teeth that are quieter and last longer.
Why Does it Fail?
Timing belts must be replaced at the manufacturer's recommended distance and/or time periods.
Failure to replace the belt can result in complete breakdown or catastrophic engine failure.
Stripped teeth leave a smooth section of belt where the drive cog will slip.
Delaminating and unraveling of the belt's fiber cores.
Breakage of the belt.
Correct belt tension is critical - too loose and the belt will whip, too tight and it will whine and put excess strain on the bearings of the cogs.
Failure of the tensioner and/or the various gear and idler bearings, causing the belt to derail.
What are the Symptoms of Failure?
A bad tensioner will usually be accompanied by noise, such as rattling coming from the timing cover area.
Drivability issues usually under high load or high rpm.
Misfires, loss of power, bucking or your car failing to start.
Any time between 60-120k miles.
Visual wear such as tears, cracks or stripped teeth.