After i replaced timing belt, tensioner and water pump. It made this really loud humming noise. It will go away after my car is 20 mph+. But when it idles the humming noise is there.
Can it be the belt too tight?
or it just needs to break in.

 

Needs to brake in brahh

 

Yeah what my friends been telling me. But searched online saying readjust the tensioner.
Just need someone who experienced this.

 

If it sounds almost like a power steering pump that's low on fluid, the belt is too tight. Give it some slack and see if it goes away.

 

Make sure you didnt missmatch were your water pump bolts go. They are different lenths.

 

if its super light hum it needs to break in wilk b fine if its over exagerated and when u punch it sounds lik u got a super charger on that thing is to tight
lot ppl leav that tensioner spring under the bus mak sure that puppy got replace aswell

 

Chances are good that the timing belt tension adjuster is too tight and needs to be readjusted. The reason the sound goes away when you speed up is that you can't hear it as the sound of the motor gets louder.

As far as leave it, it will go away... That's your call... it's your motor!

before you "leave it" you may want to give some consideration to the bearings in you motor (cam shaft, crank shaft) that are now being put under unnecessary stress. Extra tight may be fun for bedtime activities but not so good for your motor.

If you have already replaced everything, reopening the motor to get at the timing belt tensioner isn't that hard. You already know where everything is...

Just back off the tensioner mounting bolt. Have someone rotate the tensioner slightly so that you can retighten the mounting bolt. Check to make sure everything is still lined up. Tighten down the valve cover and make sure the wiring plugs are clipped back into place (make sure the wires are well out of the way) and fire the motor up. You can start the motor without the timing belt covers, alternator belt and power steering belts in place. If the noise is still there, shut off the motor and repeat the steps to place a little less tension on the belt.

As a side note. You should be able to twist the timing belt roughly 90 degrees without a lot of force.