wow man that sucks.

If the guy is worth his salt, he should at least offer a discount on labor to
rework your top end...

It is a rarity to hear that someone who is actually on top of the maintenance
plan gets pooched like this....

t

How many miles were on when you replaced the belt/pump?  The guy
shouldn't give a discount, he should do it for free.  He was the
mechanic that did the "job", he should be responsible for the repair.
Of course, if he did this job and messed it up, why would you want him
to do another job for u?

fwiw, i discovered that it's possible to over-tension the timing belt if
the tensioner bolt is too loose when adjusting.  book spec is that it's
half a turn loose - on this occasion, i'd made it looser, so that the
base of the tensioner pulley had tilted.  on tensioning, the base
leveled out and therefore pulled the belt a lot tighter than it should
have been.  i discovered this later when another project required
re-entry, and on loosening the tensioner, not only could i see the belt
loosen, but the cam gear relax - it had been elastically distorted it
was pulled so tight!

bottom line, if he's a pro, he knows what he's doing.  but we all make
mistakes on occasion.  short of a massively defective belt, [possible,
but unlikely], that would be the only other thing i can think of to
explain the problem.  other potentials such as mis-routing the belt,
i've seen, but are usually immediately evident and don't get the vehicle
out of the shop.

oh, and the other thing to look out for with an over-tensioned belt is
potential damage to the cam bearings.  in fact, the cam doesn't even
have bearings, it sits directly on the aluminum casting and is oil
lubed.  under normal belt tension, that is sufficient, but under excess
load, the oil film that normally separates can get too thin and the
aluminum can get gouged.  if that's the case, the head is done and needs
to be replaced.