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several things not aligning the Idlers properly. if you get it just wrong the pivot for the tensioner gets caught under the idler and then skews the pullies causing the belt to walk.
not replacing the Oring behind the drive gear (double stacking it or leaving it out) this lets the drive gear sit in the wrong position and the belt will walk into the edge of the gear and then off of the cam and pump gear.
not tightening the tensioner bolts correctly failing to clean out the loctite can lead to bolts that arent done up correctly, the tensioners move and the belt gets chewed as it looses tension.
over tightening the tensionser kinda obvious but unusual for it to cause such early failure unless your mates an absolute gorilla.
debry getting into the belt. this causes high points in the belt as it passes over the drive gear it lifts the belt and breaks the spine of the belt.
Mechanical failure of something driven by the cam/pump. essentially trying to drive the belt over a siezed gear, youd have to be unlucky but it does happen.
someone bent the belt. If the belts been twisted or bent too tightly then the spine of the belt will be damaged and its only a matter of time before it fails.
The key to picking out which method of failure was the cause is the damage to the belt. pics would be helpful.
if it was a transplant engine did he change the belt (my assumption) or did he just drop it in out of the box?
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