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Maybe It is just Missouri weather, but timing belt fail is extremely common here. It is one of the largest causes of death for SOHC ford engines around here. Fortunately the zetecs I run are non-interferance, even though the manufacturer says otherwise. Typical ZX2 belt fail is between 80k and 130k.
With all due respect, blanket statements about the aging of a timing belt to cause failure in the rubber is not a good idea. There are way too many environmental considerations as well as how the engine has been operated to just drop a number on it.
Also, if you are replacing belt only on an engine with 130k on it, you are setting yourself up for epic fail. You need to look at the idlers and tensioners of any belt drive system as bearing failure in these items is often the reason for timing belt fail. Additionally, since the system has worn in together, I see a lot of belts walk off if the idlers not replaced.
Respects
Tracy
Last edited by TracerZX2; 04-19-2012 at 08:48 AM..
Reason: add information
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