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Rebuilt water pumps can go out anywhere from weeks to years after their installation. Ive had a rebuilt pumps seal go bad one week after driving, and even a NEW pump seal go bad in 2 weeks. It just depends on how well the rebuild was done.
You should replace your pump when you replace your timing belts if there is any sign of leakage, or any play in the pump roller, because the extra tension you put on a new belt tends to make an old water pump start leaking. Your timing belts should be replaced every 40,000-45,000 miles at the most so at that time you should check for pump problems.
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-Gabe
-black 1988 924s, 944 turbo sway bars, LSD, gunmetal phone dials-- SOLD to some people who cannibalized her
-1987 MR2
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