What is the growling noise coming from my 94 civic motor

Belt Tension-er or Belt Idler. Alternator, Ac or Power steering pump bearings.

use a stethoscope, mines a electronic, type,Steelman. but
at harbor FRIGHT (pun) the cheap one is only $5
ok,
we drop the belt(s). on a dead cold engine.
we run cold angine for about 3min, max. (water pump is now dead stalled)
no noise now?
make sure all parts connected to the water pump belt are
quite, with a stethoscope, (easy as pie to hear and say good bad.)
use a stick and wiggle the mounts on all accessories.
not running. P/S pump, A/C compressor , Alternator, fix the loose ones.
you can run the engine dead cold with accessories belts off.
sure can.
i never do, (almost) i use my stethoscope.

my comment belt in no way conveys , cam belt ever.
this is an interference engine
so ever do the 60k cam timiing belt service. no , ooops...
get ready for bent valves and VISA card.

you will probably find that the pump impeller has disconnected it's self from the shaft in side the water pump, they are sometimes made of plastic, probably have to dig deep and check the pump as probably its driven of the cam belt, not that bad a job, may as well change the cam belt at the same time ,,,,

odds are the "growling" noise is a bearing on a pulley going out. Could be anything from altenator, steering pump, water pump, but most likely just an idler pulley. You need a mechanics stethascope to diagnose and then just need to replace the proper pulley.

Take all of the belts off for a short run at idle. If the sound goes away it is pulley related, spin each pulley and listen for bearing noise, also check for play at this time.

If the noise does not go away when the motor is driving no accessories you have a more serious problem.

NO/ MAKE SURE YOU MARK TIMING BELT POSTION BEFORE REMOVING BELT .

Does the engine still run but the water pump is just leaking?
The changing it and the timing belt at the same time is only about 2 hours work.
But.....if the water pump bearing let go and the timing belt was effected....and you bent the valves...(no more running engine) it is more cost effective to change the whole engine with a low mileage used one.

first make shure the fireing order is correct 1 3 4 2, make shure you have the timeing set right

You got it, the belt is too tight, and if you had it done at a shop, they may try and blame it on the rollers and pump, but if it wasn't noisy then it shouldn't be now. Those things however will soon fail if you continue to run it like this. Probably would have been a good idea to do the pump when it was all apart. but regardless, it must be tensioned properly and it's not right now.

if your happy the belt is in good condition; then your problem is simple;your alternator belt needs tightened it simply come loose and will come off if not tightened.hope this helps.adrian