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I put a new serpentine belt on my '99 996 Tip at 90,000 miles, but now at 123,000 miles the belt it showing signs of wear (stage 1 cracks). I expected the serpentine belt to last longer than this? Is this normal or is the belt tensioner broken/misadjusted?

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Under normal circumstances, the belt can stay 90.000 Km or 5 years on the engine. The following points should be observed: wear and/or damage to the grooved pulleys, condition of the rollers - smoothly and without any play, operation of the automatic tension system, wear of excessive play on water pump, power steering pump, AC compressor, etc., operation of the AC pump + electromagnetic clutch, freewheel pulley alternator if installed, proper belt install - alignment. Given the respectable number of miles on the car, i do expect some wear.

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I put a new serpentine belt on my '99 996 Tip at 90,000 miles, but now at 123,000 miles the belt it showing signs of wear (stage 1 cracks). I expected the serpentine belt to last longer than this? Is this normal or is the belt tensioner broken/misadjusted?

My recollection is the belt is a 60K mile replacement item. If the tensioner pulley has never been replaced,I would guess the wear you are experiencing is probably due to wear of the tensioner and perhaps idler pulley as well. Demosan

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Thanks. I'll get the components on the belt checked when I do the replacement then.

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