they are called interference fit motors if the timing belt goes it can and probly will put a valve through a piston ,so change it when the manual says to!!! At $800 must be a new car dealership? Ask around about an independant shop your friends and co-workers it should run about $450 at least it does around here. your biggest problem will be with the belt streching and jumping time so maybe a little ahead of schedule change the belt

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The mind never forgets what the hands have learned